Feat: upgrade variable assigner (#11285)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: -LAN- <laipz8200@outlook.com>

api/controllers/console/app/workflow.py

@@ -100,11 +100,11 @@ class DraftWorkflowApi(Resource):
         try:
             environment_variables_list = args.get("environment_variables") or []
             environment_variables = [
-                variable_factory.build_variable_from_mapping(obj) for obj in environment_variables_list
+                variable_factory.build_environment_variable_from_mapping(obj) for obj in environment_variables_list
             ]
             conversation_variables_list = args.get("conversation_variables") or []
             conversation_variables = [
-                variable_factory.build_variable_from_mapping(obj) for obj in conversation_variables_list
+                variable_factory.build_conversation_variable_from_mapping(obj) for obj in conversation_variables_list
             ]
             workflow = workflow_service.sync_draft_workflow(
                 app_model=app_model,
@@ -382,7 +382,7 @@ class DefaultBlockConfigApi(Resource):
         filters = None
         if args.get("q"):
             try:
-                filters = json.loads(args.get("q"))
+                filters = json.loads(args.get("q", ""))
             except json.JSONDecodeError:
                 raise ValueError("Invalid filters")
 

api/core/app/apps/workflow_app_runner.py

@@ -43,7 +43,7 @@ from core.workflow.graph_engine.entities.event import (
 )
 from core.workflow.graph_engine.entities.graph import Graph
 from core.workflow.nodes import NodeType
-from core.workflow.nodes.node_mapping import node_type_classes_mapping
+from core.workflow.nodes.node_mapping import NODE_TYPE_CLASSES_MAPPING
 from core.workflow.workflow_entry import WorkflowEntry
 from extensions.ext_database import db
 from models.model import App
@@ -138,7 +138,8 @@ class WorkflowBasedAppRunner(AppRunner):
 
         # Get node class
         node_type = NodeType(iteration_node_config.get("data", {}).get("type"))
-        node_cls = node_type_classes_mapping[node_type]
+        node_version = iteration_node_config.get("data", {}).get("version", "1")
+        node_cls = NODE_TYPE_CLASSES_MAPPING[node_type][node_version]
 
         # init variable pool
         variable_pool = VariablePool(

api/core/variables/types.py

@@ -2,16 +2,19 @@ from enum import StrEnum
 
 
 class SegmentType(StrEnum):
-    NONE = "none"
     NUMBER = "number"
     STRING = "string"
+    OBJECT = "object"
     SECRET = "secret"
+
+    FILE = "file"
+
     ARRAY_ANY = "array[any]"
     ARRAY_STRING = "array[string]"
     ARRAY_NUMBER = "array[number]"
     ARRAY_OBJECT = "array[object]"
-    OBJECT = "object"
-    FILE = "file"
     ARRAY_FILE = "array[file]"
 
+    NONE = "none"
+
     GROUP = "group"

api/core/workflow/graph_engine/graph_engine.py

@@ -38,7 +38,7 @@ from core.workflow.nodes.answer.answer_stream_processor import AnswerStreamProce
 from core.workflow.nodes.base import BaseNode
 from core.workflow.nodes.end.end_stream_processor import EndStreamProcessor
 from core.workflow.nodes.event import RunCompletedEvent, RunRetrieverResourceEvent, RunStreamChunkEvent
-from core.workflow.nodes.node_mapping import node_type_classes_mapping
+from core.workflow.nodes.node_mapping import NODE_TYPE_CLASSES_MAPPING
 from extensions.ext_database import db
 from models.enums import UserFrom
 from models.workflow import WorkflowNodeExecutionStatus, WorkflowType
@@ -227,7 +227,8 @@ class GraphEngine:
 
             # convert to specific node
             node_type = NodeType(node_config.get("data", {}).get("type"))
-            node_cls = node_type_classes_mapping[node_type]
+            node_version = node_config.get("data", {}).get("version", "1")
+            node_cls = NODE_TYPE_CLASSES_MAPPING[node_type][node_version]
 
             previous_node_id = previous_route_node_state.node_id if previous_route_node_state else None
 

api/core/workflow/nodes/answer/answer_stream_generate_router.py

@@ -153,7 +153,7 @@ class AnswerStreamGeneratorRouter:
                 NodeType.IF_ELSE,
                 NodeType.QUESTION_CLASSIFIER,
                 NodeType.ITERATION,
-                NodeType.CONVERSATION_VARIABLE_ASSIGNER,
+                NodeType.VARIABLE_ASSIGNER,
             }:
                 answer_dependencies[answer_node_id].append(source_node_id)
             else:

api/core/workflow/nodes/base/entities.py

@@ -7,6 +7,7 @@ from pydantic import BaseModel
 class BaseNodeData(ABC, BaseModel):
     title: str
     desc: Optional[str] = None
+    version: str = "1"
 
 
 class BaseIterationNodeData(BaseNodeData):

api/core/workflow/nodes/base/node.py

@@ -55,7 +55,9 @@ class BaseNode(Generic[GenericNodeData]):
             raise ValueError("Node ID is required.")
 
         self.node_id = node_id
-        self.node_data: GenericNodeData = cast(GenericNodeData, self._node_data_cls(**config.get("data", {})))
+
+        node_data = self._node_data_cls.model_validate(config.get("data", {}))
+        self.node_data = cast(GenericNodeData, node_data)
 
     @abstractmethod
     def _run(self) -> NodeRunResult | Generator[Union[NodeEvent, "InNodeEvent"], None, None]:

api/core/workflow/nodes/enums.py

@@ -14,11 +14,11 @@ class NodeType(StrEnum):
     HTTP_REQUEST = "http-request"
     TOOL = "tool"
     VARIABLE_AGGREGATOR = "variable-aggregator"
-    VARIABLE_ASSIGNER = "variable-assigner"  # TODO: Merge this into VARIABLE_AGGREGATOR in the database.
+    LEGACY_VARIABLE_AGGREGATOR = "variable-assigner"  # TODO: Merge this into VARIABLE_AGGREGATOR in the database.
     LOOP = "loop"
     ITERATION = "iteration"
     ITERATION_START = "iteration-start"  # Fake start node for iteration.
     PARAMETER_EXTRACTOR = "parameter-extractor"
-    CONVERSATION_VARIABLE_ASSIGNER = "assigner"
+    VARIABLE_ASSIGNER = "assigner"
     DOCUMENT_EXTRACTOR = "document-extractor"
     LIST_OPERATOR = "list-operator"

api/core/workflow/nodes/iteration/iteration_node.py

@@ -298,12 +298,13 @@ class IterationNode(BaseNode[IterationNodeData]):
             # variable selector to variable mapping
             try:
                 # Get node class
-                from core.workflow.nodes.node_mapping import node_type_classes_mapping
+                from core.workflow.nodes.node_mapping import NODE_TYPE_CLASSES_MAPPING
 
                 node_type = NodeType(sub_node_config.get("data", {}).get("type"))
-                node_cls = node_type_classes_mapping.get(node_type)
-                if not node_cls:
+                if node_type not in NODE_TYPE_CLASSES_MAPPING:
                     continue
+                node_version = sub_node_config.get("data", {}).get("version", "1")
+                node_cls = NODE_TYPE_CLASSES_MAPPING[node_type][node_version]
 
                 sub_node_variable_mapping = node_cls.extract_variable_selector_to_variable_mapping(
                     graph_config=graph_config, config=sub_node_config

api/core/workflow/nodes/node_mapping.py

@@ -1,3 +1,5 @@
+from collections.abc import Mapping
+
 from core.workflow.nodes.answer import AnswerNode
 from core.workflow.nodes.base import BaseNode
 from core.workflow.nodes.code import CodeNode
@@ -16,26 +18,87 @@ from core.workflow.nodes.start import StartNode
 from core.workflow.nodes.template_transform import TemplateTransformNode
 from core.workflow.nodes.tool import ToolNode
 from core.workflow.nodes.variable_aggregator import VariableAggregatorNode
-from core.workflow.nodes.variable_assigner import VariableAssignerNode
+from core.workflow.nodes.variable_assigner.v1 import VariableAssignerNode as VariableAssignerNodeV1
+from core.workflow.nodes.variable_assigner.v2 import VariableAssignerNode as VariableAssignerNodeV2
 
-node_type_classes_mapping: dict[NodeType, type[BaseNode]] = {
-    NodeType.START: StartNode,
-    NodeType.END: EndNode,
-    NodeType.ANSWER: AnswerNode,
-    NodeType.LLM: LLMNode,
-    NodeType.KNOWLEDGE_RETRIEVAL: KnowledgeRetrievalNode,
-    NodeType.IF_ELSE: IfElseNode,
-    NodeType.CODE: CodeNode,
-    NodeType.TEMPLATE_TRANSFORM: TemplateTransformNode,
-    NodeType.QUESTION_CLASSIFIER: QuestionClassifierNode,
-    NodeType.HTTP_REQUEST: HttpRequestNode,
-    NodeType.TOOL: ToolNode,
-    NodeType.VARIABLE_AGGREGATOR: VariableAggregatorNode,
-    NodeType.VARIABLE_ASSIGNER: VariableAggregatorNode,  # original name of VARIABLE_AGGREGATOR
-    NodeType.ITERATION: IterationNode,
-    NodeType.ITERATION_START: IterationStartNode,
-    NodeType.PARAMETER_EXTRACTOR: ParameterExtractorNode,
-    NodeType.CONVERSATION_VARIABLE_ASSIGNER: VariableAssignerNode,
-    NodeType.DOCUMENT_EXTRACTOR: DocumentExtractorNode,
-    NodeType.LIST_OPERATOR: ListOperatorNode,
+LATEST_VERSION = "latest"
+
+NODE_TYPE_CLASSES_MAPPING: Mapping[NodeType, Mapping[str, type[BaseNode]]] = {
+    NodeType.START: {
+        LATEST_VERSION: StartNode,
+        "1": StartNode,
+    },
+    NodeType.END: {
+        LATEST_VERSION: EndNode,
+        "1": EndNode,
+    },
+    NodeType.ANSWER: {
+        LATEST_VERSION: AnswerNode,
+        "1": AnswerNode,
+    },
+    NodeType.LLM: {
+        LATEST_VERSION: LLMNode,
+        "1": LLMNode,
+    },
+    NodeType.KNOWLEDGE_RETRIEVAL: {
+        LATEST_VERSION: KnowledgeRetrievalNode,
+        "1": KnowledgeRetrievalNode,
+    },
+    NodeType.IF_ELSE: {
+        LATEST_VERSION: IfElseNode,
+        "1": IfElseNode,
+    },
+    NodeType.CODE: {
+        LATEST_VERSION: CodeNode,
+        "1": CodeNode,
+    },
+    NodeType.TEMPLATE_TRANSFORM: {
+        LATEST_VERSION: TemplateTransformNode,
+        "1": TemplateTransformNode,
+    },
+    NodeType.QUESTION_CLASSIFIER: {
+        LATEST_VERSION: QuestionClassifierNode,
+        "1": QuestionClassifierNode,
+    },
+    NodeType.HTTP_REQUEST: {
+        LATEST_VERSION: HttpRequestNode,
+        "1": HttpRequestNode,
+    },
+    NodeType.TOOL: {
+        LATEST_VERSION: ToolNode,
+        "1": ToolNode,
+    },
+    NodeType.VARIABLE_AGGREGATOR: {
+        LATEST_VERSION: VariableAggregatorNode,
+        "1": VariableAggregatorNode,
+    },
+    NodeType.LEGACY_VARIABLE_AGGREGATOR: {
+        LATEST_VERSION: VariableAggregatorNode,
+        "1": VariableAggregatorNode,
+    },  # original name of VARIABLE_AGGREGATOR
+    NodeType.ITERATION: {
+        LATEST_VERSION: IterationNode,
+        "1": IterationNode,
+    },
+    NodeType.ITERATION_START: {
+        LATEST_VERSION: IterationStartNode,
+        "1": IterationStartNode,
+    },
+    NodeType.PARAMETER_EXTRACTOR: {
+        LATEST_VERSION: ParameterExtractorNode,
+        "1": ParameterExtractorNode,
+    },
+    NodeType.VARIABLE_ASSIGNER: {
+        LATEST_VERSION: VariableAssignerNodeV2,
+        "1": VariableAssignerNodeV1,
+        "2": VariableAssignerNodeV2,
+    },
+    NodeType.DOCUMENT_EXTRACTOR: {
+        LATEST_VERSION: DocumentExtractorNode,
+        "1": DocumentExtractorNode,
+    },
+    NodeType.LIST_OPERATOR: {
+        LATEST_VERSION: ListOperatorNode,
+        "1": ListOperatorNode,
+    },
 }

api/core/workflow/nodes/variable_assigner/__init__.py

@@ -1,8 +0,0 @@
-from .node import VariableAssignerNode
-from .node_data import VariableAssignerData, WriteMode
-
-__all__ = [
-    "VariableAssignerData",
-    "VariableAssignerNode",
-    "WriteMode",
-]

api/core/workflow/nodes/variable_assigner/common/exc.py

@@ -0,0 +1,4 @@
+class VariableOperatorNodeError(Exception):
+    """Base error type, don't use directly."""
+
+    pass

api/core/workflow/nodes/variable_assigner/common/helpers.py

@@ -0,0 +1,19 @@
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from core.variables import Variable
+from core.workflow.nodes.variable_assigner.common.exc import VariableOperatorNodeError
+from extensions.ext_database import db
+from models import ConversationVariable
+
+
+def update_conversation_variable(conversation_id: str, variable: Variable):
+    stmt = select(ConversationVariable).where(
+        ConversationVariable.id == variable.id, ConversationVariable.conversation_id == conversation_id
+    )
+    with Session(db.engine) as session:
+        row = session.scalar(stmt)
+        if not row:
+            raise VariableOperatorNodeError("conversation variable not found in the database")
+        row.data = variable.model_dump_json()
+        session.commit()

api/core/workflow/nodes/variable_assigner/exc.py

@@ -1,2 +0,0 @@
-class VariableAssignerNodeError(Exception):
-    pass

api/core/workflow/nodes/variable_assigner/v1/__init__.py

@@ -0,0 +1,3 @@
+from .node import VariableAssignerNode
+
+__all__ = ["VariableAssignerNode"]

api/core/workflow/nodes/variable_assigner/v1/node.py

@@ -1,40 +1,36 @@
-from sqlalchemy import select
-from sqlalchemy.orm import Session
-
 from core.variables import SegmentType, Variable
 from core.workflow.entities.node_entities import NodeRunResult
 from core.workflow.nodes.base import BaseNode, BaseNodeData
 from core.workflow.nodes.enums import NodeType
-from extensions.ext_database import db
+from core.workflow.nodes.variable_assigner.common import helpers as common_helpers
+from core.workflow.nodes.variable_assigner.common.exc import VariableOperatorNodeError
 from factories import variable_factory
-from models import ConversationVariable
 from models.workflow import WorkflowNodeExecutionStatus
 
-from .exc import VariableAssignerNodeError
 from .node_data import VariableAssignerData, WriteMode
 
 
 class VariableAssignerNode(BaseNode[VariableAssignerData]):
     _node_data_cls: type[BaseNodeData] = VariableAssignerData
-    _node_type: NodeType = NodeType.CONVERSATION_VARIABLE_ASSIGNER
+    _node_type = NodeType.VARIABLE_ASSIGNER
 
     def _run(self) -> NodeRunResult:
         # Should be String, Number, Object, ArrayString, ArrayNumber, ArrayObject
         original_variable = self.graph_runtime_state.variable_pool.get(self.node_data.assigned_variable_selector)
         if not isinstance(original_variable, Variable):
-            raise VariableAssignerNodeError("assigned variable not found")
+            raise VariableOperatorNodeError("assigned variable not found")
 
         match self.node_data.write_mode:
             case WriteMode.OVER_WRITE:
                 income_value = self.graph_runtime_state.variable_pool.get(self.node_data.input_variable_selector)
                 if not income_value:
-                    raise VariableAssignerNodeError("input value not found")
+                    raise VariableOperatorNodeError("input value not found")
                 updated_variable = original_variable.model_copy(update={"value": income_value.value})
 
             case WriteMode.APPEND:
                 income_value = self.graph_runtime_state.variable_pool.get(self.node_data.input_variable_selector)
                 if not income_value:
-                    raise VariableAssignerNodeError("input value not found")
+                    raise VariableOperatorNodeError("input value not found")
                 updated_value = original_variable.value + [income_value.value]
                 updated_variable = original_variable.model_copy(update={"value": updated_value})
 
@@ -43,7 +39,7 @@ class VariableAssignerNode(BaseNode[VariableAssignerData]):
                 updated_variable = original_variable.model_copy(update={"value": income_value.to_object()})
 
             case _:
-                raise VariableAssignerNodeError(f"unsupported write mode: {self.node_data.write_mode}")
+                raise VariableOperatorNodeError(f"unsupported write mode: {self.node_data.write_mode}")
 
         # Over write the variable.
         self.graph_runtime_state.variable_pool.add(self.node_data.assigned_variable_selector, updated_variable)
@@ -52,8 +48,8 @@ class VariableAssignerNode(BaseNode[VariableAssignerData]):
         # Update conversation variable.
         conversation_id = self.graph_runtime_state.variable_pool.get(["sys", "conversation_id"])
         if not conversation_id:
-            raise VariableAssignerNodeError("conversation_id not found")
-        update_conversation_variable(conversation_id=conversation_id.text, variable=updated_variable)
+            raise VariableOperatorNodeError("conversation_id not found")
+        common_helpers.update_conversation_variable(conversation_id=conversation_id.text, variable=updated_variable)
 
         return NodeRunResult(
             status=WorkflowNodeExecutionStatus.SUCCEEDED,
@@ -63,18 +59,6 @@ class VariableAssignerNode(BaseNode[VariableAssignerData]):
         )
 
 
-def update_conversation_variable(conversation_id: str, variable: Variable):
-    stmt = select(ConversationVariable).where(
-        ConversationVariable.id == variable.id, ConversationVariable.conversation_id == conversation_id
-    )
-    with Session(db.engine) as session:
-        row = session.scalar(stmt)
-        if not row:
-            raise VariableAssignerNodeError("conversation variable not found in the database")
-        row.data = variable.model_dump_json()
-        session.commit()
-
-
 def get_zero_value(t: SegmentType):
     match t:
         case SegmentType.ARRAY_OBJECT | SegmentType.ARRAY_STRING | SegmentType.ARRAY_NUMBER:
@@ -86,4 +70,4 @@ def get_zero_value(t: SegmentType):
         case SegmentType.NUMBER:
             return variable_factory.build_segment(0)
         case _:
-            raise VariableAssignerNodeError(f"unsupported variable type: {t}")
+            raise VariableOperatorNodeError(f"unsupported variable type: {t}")

api/core/workflow/nodes/variable_assigner/v1/node_data.py

@@ -1,6 +1,5 @@
 from collections.abc import Sequence
 from enum import StrEnum
-from typing import Optional
 
 from core.workflow.nodes.base import BaseNodeData
 
@@ -12,8 +11,6 @@ class WriteMode(StrEnum):
 
 
 class VariableAssignerData(BaseNodeData):
-    title: str = "Variable Assigner"
-    desc: Optional[str] = "Assign a value to a variable"
     assigned_variable_selector: Sequence[str]
     write_mode: WriteMode
     input_variable_selector: Sequence[str]

api/core/workflow/nodes/variable_assigner/v2/__init__.py

@@ -0,0 +1,3 @@
+from .node import VariableAssignerNode
+
+__all__ = ["VariableAssignerNode"]

api/core/workflow/nodes/variable_assigner/v2/constants.py

@@ -0,0 +1,11 @@
+from core.variables import SegmentType
+
+EMPTY_VALUE_MAPPING = {
+    SegmentType.STRING: "",
+    SegmentType.NUMBER: 0,
+    SegmentType.OBJECT: {},
+    SegmentType.ARRAY_ANY: [],
+    SegmentType.ARRAY_STRING: [],
+    SegmentType.ARRAY_NUMBER: [],
+    SegmentType.ARRAY_OBJECT: [],
+}

api/core/workflow/nodes/variable_assigner/v2/entities.py

@@ -0,0 +1,20 @@
+from collections.abc import Sequence
+from typing import Any
+
+from pydantic import BaseModel
+
+from core.workflow.nodes.base import BaseNodeData
+
+from .enums import InputType, Operation
+
+
+class VariableOperationItem(BaseModel):
+    variable_selector: Sequence[str]
+    input_type: InputType
+    operation: Operation
+    value: Any | None = None
+
+
+class VariableAssignerNodeData(BaseNodeData):
+    version: str = "2"
+    items: Sequence[VariableOperationItem]

api/core/workflow/nodes/variable_assigner/v2/enums.py

@@ -0,0 +1,18 @@
+from enum import StrEnum
+
+
+class Operation(StrEnum):
+    OVER_WRITE = "over-write"
+    CLEAR = "clear"
+    APPEND = "append"
+    EXTEND = "extend"
+    SET = "set"
+    ADD = "+="
+    SUBTRACT = "-="
+    MULTIPLY = "*="
+    DIVIDE = "/="
+
+
+class InputType(StrEnum):
+    VARIABLE = "variable"
+    CONSTANT = "constant"

api/core/workflow/nodes/variable_assigner/v2/exc.py

@@ -0,0 +1,31 @@
+from collections.abc import Sequence
+from typing import Any
+
+from core.workflow.nodes.variable_assigner.common.exc import VariableOperatorNodeError
+
+from .enums import InputType, Operation
+
+
+class OperationNotSupportedError(VariableOperatorNodeError):
+    def __init__(self, *, operation: Operation, varialbe_type: str):
+        super().__init__(f"Operation {operation} is not supported for type {varialbe_type}")
+
+
+class InputTypeNotSupportedError(VariableOperatorNodeError):
+    def __init__(self, *, input_type: InputType, operation: Operation):
+        super().__init__(f"Input type {input_type} is not supported for operation {operation}")
+
+
+class VariableNotFoundError(VariableOperatorNodeError):
+    def __init__(self, *, variable_selector: Sequence[str]):
+        super().__init__(f"Variable {variable_selector} not found")
+
+
+class InvalidInputValueError(VariableOperatorNodeError):
+    def __init__(self, *, value: Any):
+        super().__init__(f"Invalid input value {value}")
+
+
+class ConversationIDNotFoundError(VariableOperatorNodeError):
+    def __init__(self):
+        super().__init__("conversation_id not found")

api/core/workflow/nodes/variable_assigner/v2/helpers.py

@@ -0,0 +1,91 @@
+from typing import Any
+
+from core.variables import SegmentType
+
+from .enums import Operation
+
+
+def is_operation_supported(*, variable_type: SegmentType, operation: Operation):
+    match operation:
+        case Operation.OVER_WRITE | Operation.CLEAR:
+            return True
+        case Operation.SET:
+            return variable_type in {SegmentType.OBJECT, SegmentType.STRING, SegmentType.NUMBER}
+        case Operation.ADD | Operation.SUBTRACT | Operation.MULTIPLY | Operation.DIVIDE:
+            # Only number variable can be added, subtracted, multiplied or divided
+            return variable_type == SegmentType.NUMBER
+        case Operation.APPEND | Operation.EXTEND:
+            # Only array variable can be appended or extended
+            return variable_type in {
+                SegmentType.ARRAY_ANY,
+                SegmentType.ARRAY_OBJECT,
+                SegmentType.ARRAY_STRING,
+                SegmentType.ARRAY_NUMBER,
+                SegmentType.ARRAY_FILE,
+            }
+        case _:
+            return False
+
+
+def is_variable_input_supported(*, operation: Operation):
+    if operation in {Operation.SET, Operation.ADD, Operation.SUBTRACT, Operation.MULTIPLY, Operation.DIVIDE}:
+        return False
+    return True
+
+
+def is_constant_input_supported(*, variable_type: SegmentType, operation: Operation):
+    match variable_type:
+        case SegmentType.STRING | SegmentType.OBJECT:
+            return operation in {Operation.OVER_WRITE, Operation.SET}
+        case SegmentType.NUMBER:
+            return operation in {
+                Operation.OVER_WRITE,
+                Operation.SET,
+                Operation.ADD,
+                Operation.SUBTRACT,
+                Operation.MULTIPLY,
+                Operation.DIVIDE,
+            }
+        case _:
+            return False
+
+
+def is_input_value_valid(*, variable_type: SegmentType, operation: Operation, value: Any):
+    if operation == Operation.CLEAR:
+        return True
+    match variable_type:
+        case SegmentType.STRING:
+            return isinstance(value, str)
+
+        case SegmentType.NUMBER:
+            if not isinstance(value, int | float):
+                return False
+            if operation == Operation.DIVIDE and value == 0:
+                return False
+            return True
+
+        case SegmentType.OBJECT:
+            return isinstance(value, dict)
+
+        # Array & Append
+        case SegmentType.ARRAY_ANY if operation == Operation.APPEND:
+            return isinstance(value, str | float | int | dict)
+        case SegmentType.ARRAY_STRING if operation == Operation.APPEND:
+            return isinstance(value, str)
+        case SegmentType.ARRAY_NUMBER if operation == Operation.APPEND:
+            return isinstance(value, int | float)
+        case SegmentType.ARRAY_OBJECT if operation == Operation.APPEND:
+            return isinstance(value, dict)
+
+        # Array & Extend / Overwrite
+        case SegmentType.ARRAY_ANY if operation in {Operation.EXTEND, Operation.OVER_WRITE}:
+            return isinstance(value, list) and all(isinstance(item, str | float | int | dict) for item in value)
+        case SegmentType.ARRAY_STRING if operation in {Operation.EXTEND, Operation.OVER_WRITE}:
+            return isinstance(value, list) and all(isinstance(item, str) for item in value)
+        case SegmentType.ARRAY_NUMBER if operation in {Operation.EXTEND, Operation.OVER_WRITE}:
+            return isinstance(value, list) and all(isinstance(item, int | float) for item in value)
+        case SegmentType.ARRAY_OBJECT if operation in {Operation.EXTEND, Operation.OVER_WRITE}:
+            return isinstance(value, list) and all(isinstance(item, dict) for item in value)
+
+        case _:
+            return False

api/core/workflow/nodes/variable_assigner/v2/node.py

@@ -0,0 +1,159 @@
+import json
+from typing import Any
+
+from core.variables import SegmentType, Variable
+from core.workflow.constants import CONVERSATION_VARIABLE_NODE_ID
+from core.workflow.entities.node_entities import NodeRunResult
+from core.workflow.nodes.base import BaseNode
+from core.workflow.nodes.enums import NodeType
+from core.workflow.nodes.variable_assigner.common import helpers as common_helpers
+from core.workflow.nodes.variable_assigner.common.exc import VariableOperatorNodeError
+from models.workflow import WorkflowNodeExecutionStatus
+
+from . import helpers
+from .constants import EMPTY_VALUE_MAPPING
+from .entities import VariableAssignerNodeData
+from .enums import InputType, Operation
+from .exc import (
+    ConversationIDNotFoundError,
+    InputTypeNotSupportedError,
+    InvalidInputValueError,
+    OperationNotSupportedError,
+    VariableNotFoundError,
+)
+
+
+class VariableAssignerNode(BaseNode[VariableAssignerNodeData]):
+    _node_data_cls = VariableAssignerNodeData
+    _node_type = NodeType.VARIABLE_ASSIGNER
+
+    def _run(self) -> NodeRunResult:
+        inputs = self.node_data.model_dump()
+        process_data = {}
+        # NOTE: This node has no outputs
+        updated_variables: list[Variable] = []
+
+        try:
+            for item in self.node_data.items:
+                variable = self.graph_runtime_state.variable_pool.get(item.variable_selector)
+
+                # ==================== Validation Part
+
+                # Check if variable exists
+                if not isinstance(variable, Variable):
+                    raise VariableNotFoundError(variable_selector=item.variable_selector)
+
+                # Check if operation is supported
+                if not helpers.is_operation_supported(variable_type=variable.value_type, operation=item.operation):
+                    raise OperationNotSupportedError(operation=item.operation, varialbe_type=variable.value_type)
+
+                # Check if variable input is supported
+                if item.input_type == InputType.VARIABLE and not helpers.is_variable_input_supported(
+                    operation=item.operation
+                ):
+                    raise InputTypeNotSupportedError(input_type=InputType.VARIABLE, operation=item.operation)
+
+                # Check if constant input is supported
+                if item.input_type == InputType.CONSTANT and not helpers.is_constant_input_supported(
+                    variable_type=variable.value_type, operation=item.operation
+                ):
+                    raise InputTypeNotSupportedError(input_type=InputType.CONSTANT, operation=item.operation)
+
+                # Get value from variable pool
+                if (
+                    item.input_type == InputType.VARIABLE
+                    and item.operation != Operation.CLEAR
+                    and item.value is not None
+                ):
+                    value = self.graph_runtime_state.variable_pool.get(item.value)
+                    if value is None:
+                        raise VariableNotFoundError(variable_selector=item.value)
+                    # Skip if value is NoneSegment
+                    if value.value_type == SegmentType.NONE:
+                        continue
+                    item.value = value.value
+
+                # If set string / bytes / bytearray to object, try convert string to object.
+                if (
+                    item.operation == Operation.SET
+                    and variable.value_type == SegmentType.OBJECT
+                    and isinstance(item.value, str | bytes | bytearray)
+                ):
+                    try:
+                        item.value = json.loads(item.value)
+                    except json.JSONDecodeError:
+                        raise InvalidInputValueError(value=item.value)
+
+                # Check if input value is valid
+                if not helpers.is_input_value_valid(
+                    variable_type=variable.value_type, operation=item.operation, value=item.value
+                ):
+                    raise InvalidInputValueError(value=item.value)
+
+                # ==================== Execution Part
+
+                updated_value = self._handle_item(
+                    variable=variable,
+                    operation=item.operation,
+                    value=item.value,
+                )
+                variable = variable.model_copy(update={"value": updated_value})
+                updated_variables.append(variable)
+        except VariableOperatorNodeError as e:
+            return NodeRunResult(
+                status=WorkflowNodeExecutionStatus.FAILED,
+                inputs=inputs,
+                process_data=process_data,
+                error=str(e),
+            )
+
+        # Update variables
+        for variable in updated_variables:
+            self.graph_runtime_state.variable_pool.add(variable.selector, variable)
+            process_data[variable.name] = variable.value
+
+            if variable.selector[0] == CONVERSATION_VARIABLE_NODE_ID:
+                conversation_id = self.graph_runtime_state.variable_pool.get(["sys", "conversation_id"])
+                if not conversation_id:
+                    raise ConversationIDNotFoundError
+                else:
+                    conversation_id = conversation_id.value
+                common_helpers.update_conversation_variable(
+                    conversation_id=conversation_id,
+                    variable=variable,
+                )
+
+        return NodeRunResult(
+            status=WorkflowNodeExecutionStatus.SUCCEEDED,
+            inputs=inputs,
+            process_data=process_data,
+        )
+
+    def _handle_item(
+        self,
+        *,
+        variable: Variable,
+        operation: Operation,
+        value: Any,
+    ):
+        match operation:
+            case Operation.OVER_WRITE:
+                return value
+            case Operation.CLEAR:
+                return EMPTY_VALUE_MAPPING[variable.value_type]
+            case Operation.APPEND:
+                return variable.value + [value]
+            case Operation.EXTEND:
+                return variable.value + value
+            case Operation.SET:
+                return value
+            case Operation.ADD:
+                return variable.value + value
+            case Operation.SUBTRACT:
+                return variable.value - value
+            case Operation.MULTIPLY:
+                return variable.value * value
+            case Operation.DIVIDE:
+                return variable.value / value
+            case _:
+                raise OperationNotSupportedError(operation=operation, varialbe_type=variable.value_type)

api/core/workflow/workflow_entry.py

@@ -2,7 +2,7 @@ import logging
 import time
 import uuid
 from collections.abc import Generator, Mapping, Sequence
-from typing import Any, Optional, cast
+from typing import Any, Optional
 
 from configs import dify_config
 from core.app.apps.base_app_queue_manager import GenerateTaskStoppedError
@@ -19,7 +19,7 @@ from core.workflow.graph_engine.graph_engine import GraphEngine
 from core.workflow.nodes import NodeType
 from core.workflow.nodes.base import BaseNode
 from core.workflow.nodes.event import NodeEvent
-from core.workflow.nodes.node_mapping import node_type_classes_mapping
+from core.workflow.nodes.node_mapping import NODE_TYPE_CLASSES_MAPPING
 from factories import file_factory
 from models.enums import UserFrom
 from models.workflow import (
@@ -145,11 +145,8 @@ class WorkflowEntry:
 
         # Get node class
         node_type = NodeType(node_config.get("data", {}).get("type"))
-        node_cls = node_type_classes_mapping.get(node_type)
-        node_cls = cast(type[BaseNode], node_cls)
-
-        if not node_cls:
-            raise ValueError(f"Node class not found for node type {node_type}")
+        node_version = node_config.get("data", {}).get("version", "1")
+        node_cls = NODE_TYPE_CLASSES_MAPPING[node_type][node_version]
 
         # init variable pool
         variable_pool = VariablePool(environment_variables=workflow.environment_variables)

api/factories/variable_factory.py

@@ -36,6 +36,7 @@ from core.variables.variables import (
     StringVariable,
     Variable,
 )
+from core.workflow.constants import CONVERSATION_VARIABLE_NODE_ID, ENVIRONMENT_VARIABLE_NODE_ID
 
 
 class InvalidSelectorError(ValueError):
@@ -62,11 +63,25 @@ SEGMENT_TO_VARIABLE_MAP = {
 }
 
 
-def build_variable_from_mapping(mapping: Mapping[str, Any], /) -> Variable:
-    if (value_type := mapping.get("value_type")) is None:
-        raise VariableError("missing value type")
+def build_conversation_variable_from_mapping(mapping: Mapping[str, Any], /) -> Variable:
     if not mapping.get("name"):
         raise VariableError("missing name")
+    return _build_variable_from_mapping(mapping=mapping, selector=[CONVERSATION_VARIABLE_NODE_ID, mapping["name"]])
+
+
+def build_environment_variable_from_mapping(mapping: Mapping[str, Any], /) -> Variable:
+    if not mapping.get("name"):
+        raise VariableError("missing name")
+    return _build_variable_from_mapping(mapping=mapping, selector=[ENVIRONMENT_VARIABLE_NODE_ID, mapping["name"]])
+
+
+def _build_variable_from_mapping(*, mapping: Mapping[str, Any], selector: Sequence[str]) -> Variable:
+    """
+    This factory function is used to create the environment variable or the conversation variable,
+    not support the File type.
+    """
+    if (value_type := mapping.get("value_type")) is None:
+        raise VariableError("missing value type")
     if (value := mapping.get("value")) is None:
         raise VariableError("missing value")
     match value_type:
@@ -92,6 +107,8 @@ def build_variable_from_mapping(mapping: Mapping[str, Any], /) -> Variable:
             raise VariableError(f"not supported value type {value_type}")
     if result.size > dify_config.MAX_VARIABLE_SIZE:
         raise VariableError(f"variable size {result.size} exceeds limit {dify_config.MAX_VARIABLE_SIZE}")
+    if not result.selector:
+        result = result.model_copy(update={"selector": selector})
     return result
 
 

api/models/workflow.py

@@ -238,7 +238,9 @@ class Workflow(db.Model):
         tenant_id = contexts.tenant_id.get()
 
         environment_variables_dict: dict[str, Any] = json.loads(self._environment_variables)
-        results = [variable_factory.build_variable_from_mapping(v) for v in environment_variables_dict.values()]
+        results = [
+            variable_factory.build_environment_variable_from_mapping(v) for v in environment_variables_dict.values()
+        ]
 
         # decrypt secret variables value
         decrypt_func = (
@@ -303,7 +305,7 @@ class Workflow(db.Model):
             self._conversation_variables = "{}"
 
         variables_dict: dict[str, Any] = json.loads(self._conversation_variables)
-        results = [variable_factory.build_variable_from_mapping(v) for v in variables_dict.values()]
+        results = [variable_factory.build_conversation_variable_from_mapping(v) for v in variables_dict.values()]
         return results
 
     @conversation_variables.setter
@@ -793,4 +795,4 @@ class ConversationVariable(db.Model):
 
     def to_variable(self) -> Variable:
         mapping = json.loads(self.data)
-        return variable_factory.build_variable_from_mapping(mapping)
+        return variable_factory.build_conversation_variable_from_mapping(mapping)

api/services/app_dsl_service.py

@@ -387,11 +387,11 @@ class AppDslService:
 
             environment_variables_list = workflow_data.get("environment_variables", [])
             environment_variables = [
-                variable_factory.build_variable_from_mapping(obj) for obj in environment_variables_list
+                variable_factory.build_environment_variable_from_mapping(obj) for obj in environment_variables_list
             ]
             conversation_variables_list = workflow_data.get("conversation_variables", [])
             conversation_variables = [
-                variable_factory.build_variable_from_mapping(obj) for obj in conversation_variables_list
+                variable_factory.build_conversation_variable_from_mapping(obj) for obj in conversation_variables_list
             ]
 
             workflow_service = WorkflowService()

api/services/workflow_service.py

@@ -12,7 +12,7 @@ from core.workflow.entities.node_entities import NodeRunResult
 from core.workflow.errors import WorkflowNodeRunFailedError
 from core.workflow.nodes import NodeType
 from core.workflow.nodes.event import RunCompletedEvent
-from core.workflow.nodes.node_mapping import node_type_classes_mapping
+from core.workflow.nodes.node_mapping import LATEST_VERSION, NODE_TYPE_CLASSES_MAPPING
 from core.workflow.workflow_entry import WorkflowEntry
 from events.app_event import app_draft_workflow_was_synced, app_published_workflow_was_updated
 from extensions.ext_database import db
@@ -176,7 +176,8 @@ class WorkflowService:
         """
         # return default block config
         default_block_configs = []
-        for node_type, node_class in node_type_classes_mapping.items():
+        for node_class_mapping in NODE_TYPE_CLASSES_MAPPING.values():
+            node_class = node_class_mapping[LATEST_VERSION]
             default_config = node_class.get_default_config()
             if default_config:
                 default_block_configs.append(default_config)
@@ -190,13 +191,13 @@ class WorkflowService:
         :param filters: filter by node config parameters.
         :return:
         """
-        node_type_enum: NodeType = NodeType(node_type)
+        node_type_enum = NodeType(node_type)
 
         # return default block config
-        node_class = node_type_classes_mapping.get(node_type_enum)
-        if not node_class:
+        if node_type_enum not in NODE_TYPE_CLASSES_MAPPING:
             return None
 
+        node_class = NODE_TYPE_CLASSES_MAPPING[node_type_enum][LATEST_VERSION]
         default_config = node_class.get_default_config(filters=filters)
         if not default_config:
             return None

api/tests/integration_tests/vdb/analyticdb/test_analyticdb.py

@@ -1,4 +1,4 @@
-from core.rag.datasource.vdb.analyticdb.analyticdb_vector import AnalyticdbConfig, AnalyticdbVector
+from core.rag.datasource.vdb.analyticdb.analyticdb_vector import AnalyticdbVector
 from core.rag.datasource.vdb.analyticdb.analyticdb_vector_openapi import AnalyticdbVectorOpenAPIConfig
 from core.rag.datasource.vdb.analyticdb.analyticdb_vector_sql import AnalyticdbVectorBySqlConfig
 from tests.integration_tests.vdb.test_vector_store import AbstractVectorTest, setup_mock_redis

api/tests/unit_tests/core/app/segments/test_factory.py

@@ -19,36 +19,36 @@ from factories import variable_factory
 
 def test_string_variable():
     test_data = {"value_type": "string", "name": "test_text", "value": "Hello, World!"}
-    result = variable_factory.build_variable_from_mapping(test_data)
+    result = variable_factory.build_conversation_variable_from_mapping(test_data)
     assert isinstance(result, StringVariable)
 
 
 def test_integer_variable():
     test_data = {"value_type": "number", "name": "test_int", "value": 42}
-    result = variable_factory.build_variable_from_mapping(test_data)
+    result = variable_factory.build_conversation_variable_from_mapping(test_data)
     assert isinstance(result, IntegerVariable)
 
 
 def test_float_variable():
     test_data = {"value_type": "number", "name": "test_float", "value": 3.14}
-    result = variable_factory.build_variable_from_mapping(test_data)
+    result = variable_factory.build_conversation_variable_from_mapping(test_data)
     assert isinstance(result, FloatVariable)
 
 
 def test_secret_variable():
     test_data = {"value_type": "secret", "name": "test_secret", "value": "secret_value"}
-    result = variable_factory.build_variable_from_mapping(test_data)
+    result = variable_factory.build_conversation_variable_from_mapping(test_data)
     assert isinstance(result, SecretVariable)
 
 
 def test_invalid_value_type():
     test_data = {"value_type": "unknown", "name": "test_invalid", "value": "value"}
     with pytest.raises(VariableError):
-        variable_factory.build_variable_from_mapping(test_data)
+        variable_factory.build_conversation_variable_from_mapping(test_data)
 
 
 def test_build_a_blank_string():
-    result = variable_factory.build_variable_from_mapping(
+    result = variable_factory.build_conversation_variable_from_mapping(
         {
             "value_type": "string",
             "name": "blank",
@@ -80,7 +80,7 @@ def test_object_variable():
             "key2": 2,
         },
     }
-    variable = variable_factory.build_variable_from_mapping(mapping)
+    variable = variable_factory.build_conversation_variable_from_mapping(mapping)
     assert isinstance(variable, ObjectSegment)
     assert isinstance(variable.value["key1"], str)
     assert isinstance(variable.value["key2"], int)
@@ -97,7 +97,7 @@ def test_array_string_variable():
             "text",
         ],
     }
-    variable = variable_factory.build_variable_from_mapping(mapping)
+    variable = variable_factory.build_conversation_variable_from_mapping(mapping)
     assert isinstance(variable, ArrayStringVariable)
     assert isinstance(variable.value[0], str)
     assert isinstance(variable.value[1], str)
@@ -114,7 +114,7 @@ def test_array_number_variable():
             2.0,
         ],
     }
-    variable = variable_factory.build_variable_from_mapping(mapping)
+    variable = variable_factory.build_conversation_variable_from_mapping(mapping)
     assert isinstance(variable, ArrayNumberVariable)
     assert isinstance(variable.value[0], int)
     assert isinstance(variable.value[1], float)
@@ -137,7 +137,7 @@ def test_array_object_variable():
             },
         ],
     }
-    variable = variable_factory.build_variable_from_mapping(mapping)
+    variable = variable_factory.build_conversation_variable_from_mapping(mapping)
     assert isinstance(variable, ArrayObjectVariable)
     assert isinstance(variable.value[0], dict)
     assert isinstance(variable.value[1], dict)
@@ -149,7 +149,7 @@ def test_array_object_variable():
 
 def test_variable_cannot_large_than_200_kb():
     with pytest.raises(VariableError):
-        variable_factory.build_variable_from_mapping(
+        variable_factory.build_conversation_variable_from_mapping(
             {
                 "id": str(uuid4()),
                 "value_type": "string",

api/tests/unit_tests/core/workflow/nodes/variable_assigner/v1/test_variable_assigner_v1.py

@@ -10,7 +10,8 @@ from core.workflow.enums import SystemVariableKey
 from core.workflow.graph_engine.entities.graph import Graph
 from core.workflow.graph_engine.entities.graph_init_params import GraphInitParams
 from core.workflow.graph_engine.entities.graph_runtime_state import GraphRuntimeState
-from core.workflow.nodes.variable_assigner import VariableAssignerNode, WriteMode
+from core.workflow.nodes.variable_assigner.v1 import VariableAssignerNode
+from core.workflow.nodes.variable_assigner.v1.node_data import WriteMode
 from models.enums import UserFrom
 from models.workflow import WorkflowType
 
@@ -84,6 +85,7 @@ def test_overwrite_string_variable():
         config={
             "id": "node_id",
             "data": {
+                "title": "test",
                 "assigned_variable_selector": ["conversation", conversation_variable.name],
                 "write_mode": WriteMode.OVER_WRITE.value,
                 "input_variable_selector": [DEFAULT_NODE_ID, input_variable.name],
@@ -91,7 +93,7 @@ def test_overwrite_string_variable():
         },
     )
 
-    with mock.patch("core.workflow.nodes.variable_assigner.node.update_conversation_variable") as mock_run:
+    with mock.patch("core.workflow.nodes.variable_assigner.common.helpers.update_conversation_variable") as mock_run:
         list(node.run())
         mock_run.assert_called_once()
 
@@ -166,6 +168,7 @@ def test_append_variable_to_array():
         config={
             "id": "node_id",
             "data": {
+                "title": "test",
                 "assigned_variable_selector": ["conversation", conversation_variable.name],
                 "write_mode": WriteMode.APPEND.value,
                 "input_variable_selector": [DEFAULT_NODE_ID, input_variable.name],
@@ -173,7 +176,7 @@ def test_append_variable_to_array():
         },
     )
 
-    with mock.patch("core.workflow.nodes.variable_assigner.node.update_conversation_variable") as mock_run:
+    with mock.patch("core.workflow.nodes.variable_assigner.common.helpers.update_conversation_variable") as mock_run:
         list(node.run())
         mock_run.assert_called_once()
 
@@ -237,6 +240,7 @@ def test_clear_array():
         config={
             "id": "node_id",
             "data": {
+                "title": "test",
                 "assigned_variable_selector": ["conversation", conversation_variable.name],
                 "write_mode": WriteMode.CLEAR.value,
                 "input_variable_selector": [],
@@ -244,7 +248,7 @@ def test_clear_array():
         },
     )
 
-    with mock.patch("core.workflow.nodes.variable_assigner.node.update_conversation_variable") as mock_run:
+    with mock.patch("core.workflow.nodes.variable_assigner.common.helpers.update_conversation_variable") as mock_run:
         list(node.run())
         mock_run.assert_called_once()
 

api/tests/unit_tests/core/workflow/nodes/variable_assigner/v2/test_helpers.py

@@ -0,0 +1,24 @@
+import pytest
+
+from core.variables import SegmentType
+from core.workflow.nodes.variable_assigner.v2.enums import Operation
+from core.workflow.nodes.variable_assigner.v2.helpers import is_input_value_valid
+
+
+def test_is_input_value_valid_overwrite_array_string():
+    # Valid cases
+    assert is_input_value_valid(
+        variable_type=SegmentType.ARRAY_STRING, operation=Operation.OVER_WRITE, value=["hello", "world"]
+    )
+    assert is_input_value_valid(variable_type=SegmentType.ARRAY_STRING, operation=Operation.OVER_WRITE, value=[])
+
+    # Invalid cases
+    assert not is_input_value_valid(
+        variable_type=SegmentType.ARRAY_STRING, operation=Operation.OVER_WRITE, value="not an array"
+    )
+    assert not is_input_value_valid(
+        variable_type=SegmentType.ARRAY_STRING, operation=Operation.OVER_WRITE, value=[1, 2, 3]
+    )
+    assert not is_input_value_valid(
+        variable_type=SegmentType.ARRAY_STRING, operation=Operation.OVER_WRITE, value=["valid", 123, "invalid"]
+    )

api/tests/unit_tests/models/test_conversation_variable.py

@@ -6,7 +6,7 @@ from models import ConversationVariable
 
 
 def test_from_variable_and_to_variable():
-    variable = variable_factory.build_variable_from_mapping(
+    variable = variable_factory.build_conversation_variable_from_mapping(
         {
             "id": str(uuid4()),
             "name": "name",

api/tests/unit_tests/models/test_workflow.py

@@ -24,10 +24,18 @@ def test_environment_variables():
     )
 
     # Create some EnvironmentVariable instances
-    variable1 = StringVariable.model_validate({"name": "var1", "value": "value1", "id": str(uuid4())})
-    variable2 = IntegerVariable.model_validate({"name": "var2", "value": 123, "id": str(uuid4())})
-    variable3 = SecretVariable.model_validate({"name": "var3", "value": "secret", "id": str(uuid4())})
-    variable4 = FloatVariable.model_validate({"name": "var4", "value": 3.14, "id": str(uuid4())})
+    variable1 = StringVariable.model_validate(
+        {"name": "var1", "value": "value1", "id": str(uuid4()), "selector": ["env", "var1"]}
+    )
+    variable2 = IntegerVariable.model_validate(
+        {"name": "var2", "value": 123, "id": str(uuid4()), "selector": ["env", "var2"]}
+    )
+    variable3 = SecretVariable.model_validate(
+        {"name": "var3", "value": "secret", "id": str(uuid4()), "selector": ["env", "var3"]}
+    )
+    variable4 = FloatVariable.model_validate(
+        {"name": "var4", "value": 3.14, "id": str(uuid4()), "selector": ["env", "var4"]}
+    )
 
     with (
         mock.patch("core.helper.encrypter.encrypt_token", return_value="encrypted_token"),
@@ -58,10 +66,18 @@ def test_update_environment_variables():
     )
 
     # Create some EnvironmentVariable instances
-    variable1 = StringVariable.model_validate({"name": "var1", "value": "value1", "id": str(uuid4())})
-    variable2 = IntegerVariable.model_validate({"name": "var2", "value": 123, "id": str(uuid4())})
-    variable3 = SecretVariable.model_validate({"name": "var3", "value": "secret", "id": str(uuid4())})
-    variable4 = FloatVariable.model_validate({"name": "var4", "value": 3.14, "id": str(uuid4())})
+    variable1 = StringVariable.model_validate(
+        {"name": "var1", "value": "value1", "id": str(uuid4()), "selector": ["env", "var1"]}
+    )
+    variable2 = IntegerVariable.model_validate(
+        {"name": "var2", "value": 123, "id": str(uuid4()), "selector": ["env", "var2"]}
+    )
+    variable3 = SecretVariable.model_validate(
+        {"name": "var3", "value": "secret", "id": str(uuid4()), "selector": ["env", "var3"]}
+    )
+    variable4 = FloatVariable.model_validate(
+        {"name": "var4", "value": 3.14, "id": str(uuid4()), "selector": ["env", "var4"]}
+    )
 
     with (
         mock.patch("core.helper.encrypter.encrypt_token", return_value="encrypted_token"),

web/app/components/base/input/index.tsx

@@ -64,7 +64,9 @@ const Input = ({
           destructive && 'bg-components-input-bg-destructive border-components-input-border-destructive text-components-input-text-filled hover:bg-components-input-bg-destructive hover:border-components-input-border-destructive focus:bg-components-input-bg-destructive focus:border-components-input-border-destructive',
           className,
         )}
-        placeholder={placeholder ?? (showLeftIcon ? t('common.operation.search') ?? '' : t('common.placeholder.input'))}
+        placeholder={placeholder ?? (showLeftIcon
+          ? (t('common.operation.search') || '')
+          : (t('common.placeholder.input') || ''))}
         value={value}
         onChange={onChange}
         disabled={disabled}

web/app/components/base/list-empty/horizontal-line.tsx

@@ -0,0 +1,21 @@
+type HorizontalLineProps = {
+  className?: string
+}
+const HorizontalLine = ({
+  className,
+}: HorizontalLineProps) => {
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" width="240" height="2" viewBox="0 0 240 2" fill="none" className={className}>
+      <path d="M0 1H240" stroke="url(#paint0_linear_8619_59125)"/>
+      <defs>
+        <linearGradient id="paint0_linear_8619_59125" x1="240" y1="9.99584" x2="3.95539e-05" y2="9.88094" gradientUnits="userSpaceOnUse">
+          <stop stopColor="white" stopOpacity="0.01"/>
+          <stop offset="0.9031" stopColor="#101828" stopOpacity="0.04"/>
+          <stop offset="1" stopColor="white" stopOpacity="0.01"/>
+        </linearGradient>
+      </defs>
+    </svg>
+  )
+}
+
+export default HorizontalLine

web/app/components/base/list-empty/index.tsx

@@ -0,0 +1,35 @@
+import React from 'react'
+import { Variable02 } from '../icons/src/vender/solid/development'
+import VerticalLine from './vertical-line'
+import HorizontalLine from './horizontal-line'
+
+type ListEmptyProps = {
+  title?: string
+  description?: React.ReactNode
+}
+
+const ListEmpty = ({
+  title,
+  description,
+}: ListEmptyProps) => {
+  return (
+    <div className='flex w-[320px] p-4 flex-col items-start gap-2 rounded-[10px] bg-workflow-process-bg'>
+      <div className='flex w-10 h-10 justify-center items-center gap-2 rounded-[10px]'>
+        <div className='flex relative p-1 justify-center items-center gap-2 grow self-stretch rounded-[10px]
+          border-[0.5px] border-components-card-border bg-components-card-bg shadow-lg'>
+          <Variable02 className='w-5 h-5 shrink-0 text-text-accent' />
+          <VerticalLine className='absolute -right-[1px] top-1/2 -translate-y-1/4'/>
+          <VerticalLine className='absolute -left-[1px] top-1/2 -translate-y-1/4'/>
+          <HorizontalLine className='absolute top-0 left-3/4 -translate-x-1/4 -translate-y-1/2'/>
+          <HorizontalLine className='absolute top-full left-3/4 -translate-x-1/4 -translate-y-1/2' />
+        </div>
+      </div>
+      <div className='flex flex-col items-start gap-1 self-stretch'>
+        <div className='text-text-secondary system-sm-medium'>{title}</div>
+        {description}
+      </div>
+    </div>
+  )
+}
+
+export default ListEmpty

web/app/components/base/list-empty/vertical-line.tsx

@@ -0,0 +1,21 @@
+type VerticalLineProps = {
+  className?: string
+}
+const VerticalLine = ({
+  className,
+}: VerticalLineProps) => {
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" width="2" height="132" viewBox="0 0 2 132" fill="none" className={className}>
+      <path d="M1 0L1 132" stroke="url(#paint0_linear_8619_59128)"/>
+      <defs>
+        <linearGradient id="paint0_linear_8619_59128" x1="-7.99584" y1="132" x2="-7.96108" y2="6.4974e-07" gradientUnits="userSpaceOnUse">
+          <stop stopColor="white" stopOpacity="0.01"/>
+          <stop offset="0.877606" stopColor="#101828" stopOpacity="0.04"/>
+          <stop offset="1" stopColor="white" stopOpacity="0.01"/>
+        </linearGradient>
+      </defs>
+    </svg>
+  )
+}
+
+export default VerticalLine

web/app/components/workflow/block-icon.tsx

@@ -48,6 +48,7 @@ const getIcon = (type: BlockEnum, className: string) => {
     [BlockEnum.VariableAggregator]: <VariableX className={className} />,
     [BlockEnum.Assigner]: <Assigner className={className} />,
     [BlockEnum.Tool]: <VariableX className={className} />,
+    [BlockEnum.IterationStart]: <VariableX className={className} />,
     [BlockEnum.Iteration]: <Iteration className={className} />,
     [BlockEnum.ParameterExtractor]: <ParameterExtractor className={className} />,
     [BlockEnum.DocExtractor]: <DocsExtractor className={className} />,

web/app/components/workflow/nodes/_base/components/editor/code-editor/index.tsx

@@ -33,6 +33,7 @@ export type Props = {
   showFileList?: boolean
   onGenerated?: (value: string) => void
   showCodeGenerator?: boolean
+  className?: string
 }
 
 export const languageMap = {
@@ -67,6 +68,7 @@ const CodeEditor: FC<Props> = ({
   showFileList,
   onGenerated,
   showCodeGenerator = false,
+  className,
 }) => {
   const [isFocus, setIsFocus] = React.useState(false)
   const [isMounted, setIsMounted] = React.useState(false)
@@ -187,7 +189,7 @@ const CodeEditor: FC<Props> = ({
   )
 
   return (
-    <div className={cn(isExpand && 'h-full')}>
+    <div className={cn(isExpand && 'h-full', className)}>
       {noWrapper
         ? <div className='relative no-wrapper' style={{
           height: isExpand ? '100%' : (editorContentHeight) / 2 + CODE_EDITOR_LINE_HEIGHT, // In IDE, the last line can always be in lop line. So there is some blank space in the bottom.

web/app/components/workflow/nodes/_base/components/field.tsx

@@ -47,7 +47,6 @@ const Field: FC<Props> = ({
               triggerClassName='w-4 h-4 ml-1'
             />
           )}
-
         </div>
         <div className='flex'>
           {operations && <div>{operations}</div>}

web/app/components/workflow/nodes/_base/components/list-no-data-placeholder.tsx

@@ -10,7 +10,7 @@ const ListNoDataPlaceholder: FC<Props> = ({
   children,
 }) => {
   return (
-    <div className='flex rounded-md bg-gray-50 items-center min-h-[42px] justify-center leading-[18px] text-xs font-normal text-gray-500'>
+    <div className='flex w-full rounded-[10px] bg-background-section items-center min-h-[42px] justify-center system-xs-regular text-text-tertiary'>
       {children}
     </div>
   )

web/app/components/workflow/nodes/_base/components/variable/assigned-var-reference-popup.tsx

@@ -0,0 +1,39 @@
+'use client'
+import type { FC } from 'react'
+import React from 'react'
+import { useTranslation } from 'react-i18next'
+import VarReferenceVars from './var-reference-vars'
+import type { NodeOutPutVar, ValueSelector, Var } from '@/app/components/workflow/types'
+import ListEmpty from '@/app/components/base/list-empty'
+
+type Props = {
+  vars: NodeOutPutVar[]
+  onChange: (value: ValueSelector, varDetail: Var) => void
+  itemWidth?: number
+}
+const AssignedVarReferencePopup: FC<Props> = ({
+  vars,
+  onChange,
+  itemWidth,
+}) => {
+  const { t } = useTranslation()
+  // max-h-[300px] overflow-y-auto todo: use portal to handle long list
+  return (
+    <div className='p-1 bg-components-panel-bg-bur rounded-lg border-[0.5px] border-components-panel-border shadow-lg w-[352px]' >
+      {(!vars || vars.length === 0)
+        ? <ListEmpty
+          title={t('workflow.nodes.assigner.noAssignedVars') || ''}
+          description={t('workflow.nodes.assigner.assignedVarsDescription')}
+        />
+        : <VarReferenceVars
+          searchBoxClassName='mt-1'
+          vars={vars}
+          onChange={onChange}
+          itemWidth={itemWidth}
+          isSupportFileVar
+        />
+      }
+    </div >
+  )
+}
+export default React.memo(AssignedVarReferencePopup)

web/app/components/workflow/nodes/_base/components/variable/var-reference-picker.tsx

@@ -60,6 +60,9 @@ type Props = {
   onRemove?: () => void
   typePlaceHolder?: string
   isSupportFileVar?: boolean
+  placeholder?: string
+  minWidth?: number
+  popupFor?: 'assigned' | 'toAssigned'
 }
 
 const VarReferencePicker: FC<Props> = ({
@@ -83,6 +86,9 @@ const VarReferencePicker: FC<Props> = ({
   onRemove,
   typePlaceHolder,
   isSupportFileVar = true,
+  placeholder,
+  minWidth,
+  popupFor,
 }) => {
   const { t } = useTranslation()
   const store = useStoreApi()
@@ -261,7 +267,7 @@ const VarReferencePicker: FC<Props> = ({
                   <AddButton onClick={() => { }}></AddButton>
                 </div>
               )
-              : (<div ref={!isSupportConstantValue ? triggerRef : null} className={cn((open || isFocus) ? 'border-gray-300' : 'border-gray-100', 'relative group/wrap flex items-center w-full h-8', !isSupportConstantValue && 'p-1 rounded-lg bg-gray-100 border', isInTable && 'bg-transparent border-none')}>
+              : (<div ref={!isSupportConstantValue ? triggerRef : null} className={cn((open || isFocus) ? 'border-gray-300' : 'border-gray-100', 'relative group/wrap flex items-center w-full h-8', !isSupportConstantValue && 'p-1 rounded-lg bg-gray-100 border', isInTable && 'bg-transparent border-none', readonly && 'bg-components-input-bg-disabled')}>
                 {isSupportConstantValue
                   ? <div onClick={(e) => {
                     e.stopPropagation()
@@ -285,7 +291,7 @@ const VarReferencePicker: FC<Props> = ({
                     />
                   </div>
                   : (!hasValue && <div className='ml-1.5 mr-1'>
-                    <Variable02 className='w-3.5 h-3.5 text-gray-400' />
+                    <Variable02 className={`w-4 h-4 ${readonly ? 'text-components-input-text-disabled' : 'text-components-input-text-placeholder'}`} />
                   </div>)}
                 {isConstant
                   ? (
@@ -329,17 +335,17 @@ const VarReferencePicker: FC<Props> = ({
                                     {!hasValue && <Variable02 className='w-3.5 h-3.5' />}
                                     {isEnv && <Env className='w-3.5 h-3.5 text-util-colors-violet-violet-600' />}
                                     {isChatVar && <BubbleX className='w-3.5 h-3.5 text-util-colors-teal-teal-700' />}
-                                    <div className={cn('ml-0.5 text-xs font-medium truncate', (isEnv || isChatVar) && '!text-text-secondary')} title={varName} style={{
+                                    <div className={cn('ml-0.5 text-xs font-medium truncate', isEnv && '!text-text-secondary', isChatVar && 'text-util-colors-teal-teal-700')} title={varName} style={{
                                       maxWidth: maxVarNameWidth,
                                     }}>{varName}</div>
                                   </div>
-                                  <div className='ml-0.5 text-xs font-normal text-gray-500 capitalize truncate' title={type} style={{
+                                  <div className='ml-0.5 capitalize truncate text-text-tertiary text-center system-xs-regular' title={type} style={{
                                     maxWidth: maxTypeWidth,
                                   }}>{type}</div>
                                   {!isValidVar && <RiErrorWarningFill className='ml-0.5 w-3 h-3 text-[#D92D20]' />}
                                 </>
                               )
-                              : <div className='text-[13px] font-normal text-gray-400'>{t('workflow.common.setVarValuePlaceholder')}</div>}
+                              : <div className={`overflow-hidden ${readonly ? 'text-components-input-text-disabled' : 'text-components-input-text-placeholder'} text-ellipsis system-sm-regular`}>{placeholder ?? t('workflow.common.setVarValuePlaceholder')}</div>}
                           </div>
                         </Tooltip>
                       </div>
@@ -378,12 +384,13 @@ const VarReferencePicker: FC<Props> = ({
         </WrapElem>
         <PortalToFollowElemContent style={{
           zIndex: 100,
-        }}>
+        }} className='mt-1'>
           {!isConstant && (
             <VarReferencePopup
               vars={outputVars}
+              popupFor={popupFor}
               onChange={handleVarReferenceChange}
-              itemWidth={isAddBtnTrigger ? 260 : triggerWidth}
+              itemWidth={isAddBtnTrigger ? 260 : (minWidth || triggerWidth)}
               isSupportFileVar={isSupportFileVar}
             />
           )}

web/app/components/workflow/nodes/_base/components/variable/var-reference-popup.tsx

@@ -1,33 +1,64 @@
 'use client'
 import type { FC } from 'react'
 import React from 'react'
+import { useTranslation } from 'react-i18next'
+import { useContext } from 'use-context-selector'
 import VarReferenceVars from './var-reference-vars'
 import type { NodeOutPutVar, ValueSelector, Var } from '@/app/components/workflow/types'
+import ListEmpty from '@/app/components/base/list-empty'
+import { LanguagesSupported } from '@/i18n/language'
+import I18n from '@/context/i18n'
 
 type Props = {
   vars: NodeOutPutVar[]
+  popupFor?: 'assigned' | 'toAssigned'
   onChange: (value: ValueSelector, varDetail: Var) => void
   itemWidth?: number
   isSupportFileVar?: boolean
 }
 const VarReferencePopup: FC<Props> = ({
   vars,
+  popupFor,
   onChange,
   itemWidth,
   isSupportFileVar = true,
 }) => {
+  const { t } = useTranslation()
+  const { locale } = useContext(I18n)
   // max-h-[300px] overflow-y-auto todo: use portal to handle long list
   return (
     <div className='p-1 bg-white rounded-lg border border-gray-200 shadow-lg space-y-1' style={{
       width: itemWidth || 228,
     }}>
-      <VarReferenceVars
+      {((!vars || vars.length === 0) && popupFor)
+        ? (popupFor === 'toAssigned'
+          ? (
+            <ListEmpty
+              title={t('workflow.variableReference.noAvailableVars') || ''}
+              description={<div className='text-text-tertiary system-xs-regular'>
+                {t('workflow.variableReference.noVarsForOperation')}
+              </div>}
+            />
+          )
+          : (
+            <ListEmpty
+              title={t('workflow.variableReference.noAssignedVars') || ''}
+              description={<div className='text-text-tertiary system-xs-regular'>
+                {t('workflow.variableReference.assignedVarsDescription')}
+                <a target='_blank' rel='noopener noreferrer'
+                  className='text-text-accent-secondary'
+                  href={locale !== LanguagesSupported[1] ? 'https://docs.dify.ai/guides/workflow/variables#conversation-variables' : `https://docs.dify.ai/${locale.toLowerCase()}/guides/workflow/variables#hui-hua-bian-liang`}>{t('workflow.variableReference.conversationVars')}</a>
+              </div>}
+            />
+          ))
+        : <VarReferenceVars
           searchBoxClassName='mt-1'
           vars={vars}
           onChange={onChange}
           itemWidth={itemWidth}
           isSupportFileVar={isSupportFileVar}
         />
+      }
     </div >
   )
 }

web/app/components/workflow/nodes/_base/hooks/use-one-step-run.ts

@@ -24,6 +24,7 @@ import QuestionClassifyDefault from '@/app/components/workflow/nodes/question-cl
 import HTTPDefault from '@/app/components/workflow/nodes/http/default'
 import ToolDefault from '@/app/components/workflow/nodes/tool/default'
 import VariableAssigner from '@/app/components/workflow/nodes/variable-assigner/default'
+import Assigner from '@/app/components/workflow/nodes/assigner/default'
 import ParameterExtractorDefault from '@/app/components/workflow/nodes/parameter-extractor/default'
 import IterationDefault from '@/app/components/workflow/nodes/iteration/default'
 import { ssePost } from '@/service/base'
@@ -39,6 +40,7 @@ const { checkValid: checkQuestionClassifyValid } = QuestionClassifyDefault
 const { checkValid: checkHttpValid } = HTTPDefault
 const { checkValid: checkToolValid } = ToolDefault
 const { checkValid: checkVariableAssignerValid } = VariableAssigner
+const { checkValid: checkAssignerValid } = Assigner
 const { checkValid: checkParameterExtractorValid } = ParameterExtractorDefault
 const { checkValid: checkIterationValid } = IterationDefault
 
@@ -51,7 +53,7 @@ const checkValidFns: Record<BlockEnum, Function> = {
   [BlockEnum.QuestionClassifier]: checkQuestionClassifyValid,
   [BlockEnum.HttpRequest]: checkHttpValid,
   [BlockEnum.Tool]: checkToolValid,
-  [BlockEnum.VariableAssigner]: checkVariableAssignerValid,
+  [BlockEnum.VariableAssigner]: checkAssignerValid,
   [BlockEnum.VariableAggregator]: checkVariableAssignerValid,
   [BlockEnum.ParameterExtractor]: checkParameterExtractorValid,
   [BlockEnum.Iteration]: checkIterationValid,

web/app/components/workflow/nodes/assigner/components/operation-selector.tsx

@@ -0,0 +1,128 @@
+import type { FC } from 'react'
+import { useState } from 'react'
+import {
+  RiArrowDownSLine,
+  RiCheckLine,
+} from '@remixicon/react'
+import classNames from 'classnames'
+import { useTranslation } from 'react-i18next'
+import type { WriteMode } from '../types'
+import { getOperationItems } from '../utils'
+import {
+  PortalToFollowElem,
+  PortalToFollowElemContent,
+  PortalToFollowElemTrigger,
+} from '@/app/components/base/portal-to-follow-elem'
+import type { VarType } from '@/app/components/workflow/types'
+import Divider from '@/app/components/base/divider'
+
+type Item = {
+  value: string | number
+  name: string
+}
+
+type OperationSelectorProps = {
+  value: string | number
+  onSelect: (value: Item) => void
+  placeholder?: string
+  disabled?: boolean
+  className?: string
+  popupClassName?: string
+  assignedVarType?: VarType
+  writeModeTypes?: WriteMode[]
+  writeModeTypesArr?: WriteMode[]
+  writeModeTypesNum?: WriteMode[]
+}
+
+const i18nPrefix = 'workflow.nodes.assigner'
+
+const OperationSelector: FC<OperationSelectorProps> = ({
+  value,
+  onSelect,
+  disabled = false,
+  className,
+  popupClassName,
+  assignedVarType,
+  writeModeTypes,
+  writeModeTypesArr,
+  writeModeTypesNum,
+}) => {
+  const { t } = useTranslation()
+  const [open, setOpen] = useState(false)
+
+  const items = getOperationItems(assignedVarType, writeModeTypes, writeModeTypesArr, writeModeTypesNum)
+
+  const selectedItem = items.find(item => item.value === value)
+
+  return (
+    <PortalToFollowElem
+      open={open}
+      onOpenChange={setOpen}
+      placement='bottom-start'
+      offset={4}
+    >
+      <PortalToFollowElemTrigger
+        onClick={() => !disabled && setOpen(v => !v)}
+      >
+        <div
+          className={classNames(
+            'flex items-center px-2 py-1 gap-0.5 rounded-lg bg-components-input-bg-normal',
+            disabled ? 'cursor-not-allowed !bg-components-input-bg-disabled' : 'cursor-pointer hover:bg-state-base-hover-alt',
+            open && 'bg-state-base-hover-alt',
+            className,
+          )}
+        >
+          <div className='flex p-1 items-center'>
+            <span
+              className={`truncate overflow-hidden text-ellipsis system-sm-regular
+                ${selectedItem ? 'text-components-input-text-filled' : 'text-components-input-text-disabled'}`}
+            >
+              {selectedItem?.name ? t(`${i18nPrefix}.operations.${selectedItem?.name}`) : t(`${i18nPrefix}.operations.title`)}
+            </span>
+          </div>
+          <RiArrowDownSLine className={`h-4 w-4 text-text-quaternary ${disabled && 'text-components-input-text-placeholder'} ${open && 'text-text-secondary'}`} />
+        </div>
+      </PortalToFollowElemTrigger>
+
+      <PortalToFollowElemContent className={`z-20 ${popupClassName}`}>
+        <div className='flex w-[140px] flex-col items-start rounded-xl border-[0.5px] border-components-panel-border bg-components-panel-bg-blur shadow-lg'>
+          <div className='flex p-1 flex-col items-start self-stretch'>
+            <div className='flex px-3 pt-1 pb-0.5 items-start self-stretch'>
+              <div className='flex grow text-text-tertiary system-xs-medium-uppercase'>{t(`${i18nPrefix}.operations.title`)}</div>
+            </div>
+            {items.map(item => (
+              item.value === 'divider'
+                ? (
+                  <Divider key="divider" className="my-1" />
+                )
+                : (
+                  <div
+                    key={item.value}
+                    className={classNames(
+                      'flex items-center px-2 py-1 gap-1 self-stretch rounded-lg',
+                      'cursor-pointer hover:bg-state-base-hover',
+                    )}
+                    onClick={() => {
+                      onSelect(item)
+                      setOpen(false)
+                    }}
+                  >
+                    <div className='flex min-h-5 px-1 items-center gap-1 grow'>
+                      <span className={'flex flex-grow text-text-secondary system-sm-medium'}>{t(`${i18nPrefix}.operations.${item.name}`)}</span>
+                    </div>
+                    {item.value === value && (
+                      <div className='flex justify-center items-center'>
+                        <RiCheckLine className='h-4 w-4 text-text-accent' />
+                      </div>
+                    )}
+                  </div>
+                )
+            ))}
+          </div>
+        </div>
+      </PortalToFollowElemContent>
+    </PortalToFollowElem>
+  )
+}
+
+export default OperationSelector

web/app/components/workflow/nodes/assigner/components/var-list/index.tsx

@@ -0,0 +1,227 @@
+'use client'
+import type { FC } from 'react'
+import { useTranslation } from 'react-i18next'
+import React, { useCallback } from 'react'
+import produce from 'immer'
+import { RiDeleteBinLine } from '@remixicon/react'
+import OperationSelector from '../operation-selector'
+import { AssignerNodeInputType, WriteMode } from '../../types'
+import type { AssignerNodeOperation } from '../../types'
+import ListNoDataPlaceholder from '@/app/components/workflow/nodes/_base/components/list-no-data-placeholder'
+import VarReferencePicker from '@/app/components/workflow/nodes/_base/components/variable/var-reference-picker'
+import type { ValueSelector, Var, VarType } from '@/app/components/workflow/types'
+import { CodeLanguage } from '@/app/components/workflow/nodes/code/types'
+import ActionButton from '@/app/components/base/action-button'
+import Input from '@/app/components/base/input'
+import Textarea from '@/app/components/base/textarea'
+import CodeEditor from '@/app/components/workflow/nodes/_base/components/editor/code-editor'
+
+type Props = {
+  readonly: boolean
+  nodeId: string
+  list: AssignerNodeOperation[]
+  onChange: (list: AssignerNodeOperation[], value?: ValueSelector) => void
+  onOpen?: (index: number) => void
+  filterVar?: (payload: Var, valueSelector: ValueSelector) => boolean
+  filterToAssignedVar?: (payload: Var, assignedVarType: VarType, write_mode: WriteMode) => boolean
+  getAssignedVarType?: (valueSelector: ValueSelector) => VarType
+  getToAssignedVarType?: (assignedVarType: VarType, write_mode: WriteMode) => VarType
+  writeModeTypes?: WriteMode[]
+  writeModeTypesArr?: WriteMode[]
+  writeModeTypesNum?: WriteMode[]
+}
+
+const VarList: FC<Props> = ({
+  readonly,
+  nodeId,
+  list,
+  onChange,
+  onOpen = () => { },
+  filterVar,
+  filterToAssignedVar,
+  getAssignedVarType,
+  getToAssignedVarType,
+  writeModeTypes,
+  writeModeTypesArr,
+  writeModeTypesNum,
+}) => {
+  const { t } = useTranslation()
+  const handleAssignedVarChange = useCallback((index: number) => {
+    return (value: ValueSelector | string) => {
+      const newList = produce(list, (draft) => {
+        draft[index].variable_selector = value as ValueSelector
+        draft[index].operation = WriteMode.overwrite
+        draft[index].value = undefined
+      })
+      onChange(newList, value as ValueSelector)
+    }
+  }, [list, onChange])
+
+  const handleOperationChange = useCallback((index: number) => {
+    return (item: { value: string | number }) => {
+      const newList = produce(list, (draft) => {
+        draft[index].operation = item.value as WriteMode
+        draft[index].value = '' // Clear value when operation changes
+        if (item.value === WriteMode.set || item.value === WriteMode.increment || item.value === WriteMode.decrement
+          || item.value === WriteMode.multiply || item.value === WriteMode.divide)
+          draft[index].input_type = AssignerNodeInputType.constant
+        else
+          draft[index].input_type = AssignerNodeInputType.variable
+      })
+      onChange(newList)
+    }
+  }, [list, onChange])
+
+  const handleToAssignedVarChange = useCallback((index: number) => {
+    return (value: ValueSelector | string | number) => {
+      const newList = produce(list, (draft) => {
+        draft[index].value = value as ValueSelector
+      })
+      onChange(newList, value as ValueSelector)
+    }
+  }, [list, onChange])
+
+  const handleVarRemove = useCallback((index: number) => {
+    return () => {
+      const newList = produce(list, (draft) => {
+        draft.splice(index, 1)
+      })
+      onChange(newList)
+    }
+  }, [list, onChange])
+
+  const handleOpen = useCallback((index: number) => {
+    return () => onOpen(index)
+  }, [onOpen])
+
+  const handleFilterToAssignedVar = useCallback((index: number) => {
+    return (payload: Var, valueSelector: ValueSelector) => {
+      const item = list[index]
+      const assignedVarType = item.variable_selector ? getAssignedVarType?.(item.variable_selector) : undefined
+
+      if (!filterToAssignedVar || !item.variable_selector || !assignedVarType || !item.operation)
+        return true
+
+      return filterToAssignedVar(
+        payload,
+        assignedVarType,
+        item.operation,
+      )
+    }
+  }, [list, filterToAssignedVar, getAssignedVarType])
+
+  if (list.length === 0) {
+    return (
+      <ListNoDataPlaceholder>
+        {t('workflow.nodes.assigner.noVarTip')}
+      </ListNoDataPlaceholder>
+    )
+  }
+
+  return (
+    <div className='flex flex-col items-start gap-4 self-stretch'>
+      {list.map((item, index) => {
+        const assignedVarType = item.variable_selector ? getAssignedVarType?.(item.variable_selector) : undefined
+        const toAssignedVarType = (assignedVarType && item.operation && getToAssignedVarType)
+          ? getToAssignedVarType(assignedVarType, item.operation)
+          : undefined
+
+        return (
+          <div className='flex items-start gap-1 self-stretch' key={index}>
+            <div className='flex flex-col items-start gap-1 flex-grow'>
+              <div className='flex items-center gap-1 self-stretch'>
+                <VarReferencePicker
+                  readonly={readonly}
+                  nodeId={nodeId}
+                  isShowNodeName
+                  value={item.variable_selector || []}
+                  onChange={handleAssignedVarChange(index)}
+                  onOpen={handleOpen(index)}
+                  filterVar={filterVar}
+                  placeholder={t('workflow.nodes.assigner.selectAssignedVariable') as string}
+                  minWidth={352}
+                  popupFor='assigned'
+                  className='w-full'
+                />
+                <OperationSelector
+                  value={item.operation}
+                  placeholder='Operation'
+                  disabled={!item.variable_selector || item.variable_selector.length === 0}
+                  onSelect={handleOperationChange(index)}
+                  assignedVarType={assignedVarType}
+                  writeModeTypes={writeModeTypes}
+                  writeModeTypesArr={writeModeTypesArr}
+                  writeModeTypesNum={writeModeTypesNum}
+                />
+              </div>
+              {item.operation !== WriteMode.clear && item.operation !== WriteMode.set
+                && !writeModeTypesNum?.includes(item.operation)
+                && (
+                  <VarReferencePicker
+                    readonly={readonly || !item.variable_selector || !item.operation}
+                    nodeId={nodeId}
+                    isShowNodeName
+                    value={item.value}
+                    onChange={handleToAssignedVarChange(index)}
+                    filterVar={handleFilterToAssignedVar(index)}
+                    valueTypePlaceHolder={toAssignedVarType}
+                    placeholder={t('workflow.nodes.assigner.setParameter') as string}
+                    minWidth={352}
+                    popupFor='toAssigned'
+                    className='w-full'
+                  />
+                )
+              }
+              {item.operation === WriteMode.set && assignedVarType && (
+                <>
+                  {assignedVarType === 'number' && (
+                    <Input
+                      type="number"
+                      value={item.value as number}
+                      onChange={e => handleToAssignedVarChange(index)(Number(e.target.value))}
+                      className='w-full'
+                    />
+                  )}
+                  {assignedVarType === 'string' && (
+                    <Textarea
+                      value={item.value as string}
+                      onChange={e => handleToAssignedVarChange(index)(e.target.value)}
+                      className='w-full'
+                    />
+                  )}
+                  {assignedVarType === 'object' && (
+                    <CodeEditor
+                      value={item.value as string}
+                      language={CodeLanguage.json}
+                      onChange={value => handleToAssignedVarChange(index)(value)}
+                      className='w-full'
+                      readOnly={readonly}
+                    />
+                  )}
+                </>
+              )}
+              {writeModeTypesNum?.includes(item.operation)
+                && <Input
+                  type="number"
+                  value={item.value as number}
+                  onChange={e => handleToAssignedVarChange(index)(Number(e.target.value))}
+                  placeholder="Enter number value..."
+                  className='w-full'
+                />
+              }
+            </div>
+            <ActionButton
+              size='l'
+              className='flex-shrink-0 group hover:!bg-state-destructive-hover'
+              onClick={handleVarRemove(index)}
+            >
+              <RiDeleteBinLine className='text-text-tertiary w-4 h-4 group-hover:text-text-destructive' />
+            </ActionButton>
+          </div>
+        )
+      },
+      )}
+    </div>
+  )
+}
+export default React.memo(VarList)

web/app/components/workflow/nodes/assigner/components/var-list/use-var-list.ts

@@ -0,0 +1,39 @@
+import { useCallback } from 'react'
+import produce from 'immer'
+import type { AssignerNodeOperation, AssignerNodeType } from '../../types'
+import { AssignerNodeInputType, WriteMode } from '../../types'
+
+type Params = {
+  id: string
+  inputs: AssignerNodeType
+  setInputs: (newInputs: AssignerNodeType) => void
+}
+function useVarList({
+  inputs,
+  setInputs,
+}: Params) {
+  const handleVarListChange = useCallback((newList: AssignerNodeOperation[]) => {
+    const newInputs = produce(inputs, (draft) => {
+      draft.items = newList
+    })
+    setInputs(newInputs)
+  }, [inputs, setInputs])
+
+  const handleAddVariable = useCallback(() => {
+    const newInputs = produce(inputs, (draft) => {
+      draft.items.push({
+        variable_selector: [],
+        input_type: AssignerNodeInputType.constant,
+        operation: WriteMode.overwrite,
+        value: '',
+      })
+    })
+    setInputs(newInputs)
+  }, [inputs, setInputs])
+  return {
+    handleVarListChange,
+    handleAddVariable,
+  }
+}
+
+export default useVarList

web/app/components/workflow/nodes/assigner/default.ts

@@ -6,9 +6,8 @@ const i18nPrefix = 'workflow.errorMsg'
 
 const nodeDefault: NodeDefault<AssignerNodeType> = {
   defaultValue: {
-    assigned_variable_selector: [],
-    write_mode: WriteMode.Overwrite,
-    input_variable_selector: [],
+    version: '2',
+    items: [],
   },
   getAvailablePrevNodes(isChatMode: boolean) {
     const nodes = isChatMode
@@ -23,18 +22,23 @@ const nodeDefault: NodeDefault<AssignerNodeType> = {
   checkValid(payload: AssignerNodeType, t: any) {
     let errorMessages = ''
     const {
-      assigned_variable_selector: assignedVarSelector,
-      write_mode: writeMode,
-      input_variable_selector: toAssignerVarSelector,
+      items: operationItems,
     } = payload
 
-    if (!errorMessages && !assignedVarSelector?.length)
+    operationItems?.forEach((value) => {
+      if (!errorMessages && !value.variable_selector?.length)
         errorMessages = t(`${i18nPrefix}.fieldRequired`, { field: t('workflow.nodes.assigner.assignedVariable') })
 
-    if (!errorMessages && writeMode !== WriteMode.Clear) {
-      if (!toAssignerVarSelector?.length)
+      if (!errorMessages && value.operation !== WriteMode.clear) {
+        if (value.operation === WriteMode.set) {
+          if (!value.value && typeof value.value !== 'number')
             errorMessages = t(`${i18nPrefix}.fieldRequired`, { field: t('workflow.nodes.assigner.variable') })
         }
+        else if (!value.value?.length) {
+          errorMessages = t(`${i18nPrefix}.fieldRequired`, { field: t('workflow.nodes.assigner.variable') })
+        }
+      }
+    })
 
     return {
       isValid: !errorMessages,

web/app/components/workflow/nodes/assigner/hooks.ts

@@ -0,0 +1,70 @@
+import { useCallback } from 'react'
+import {
+  useNodes,
+} from 'reactflow'
+import { uniqBy } from 'lodash-es'
+import {
+  useIsChatMode,
+  useWorkflow,
+  useWorkflowVariables,
+} from '../../hooks'
+import type {
+  Node,
+  Var,
+} from '../../types'
+import { AssignerNodeInputType, WriteMode } from './types'
+
+export const useGetAvailableVars = () => {
+  const nodes: Node[] = useNodes()
+  const { getBeforeNodesInSameBranchIncludeParent } = useWorkflow()
+  const { getNodeAvailableVars } = useWorkflowVariables()
+  const isChatMode = useIsChatMode()
+  const getAvailableVars = useCallback((nodeId: string, handleId: string, filterVar: (v: Var) => boolean, hideEnv = false) => {
+    const availableNodes: Node[] = []
+    const currentNode = nodes.find(node => node.id === nodeId)!
+
+    if (!currentNode)
+      return []
+
+    const beforeNodes = getBeforeNodesInSameBranchIncludeParent(nodeId)
+    availableNodes.push(...beforeNodes)
+    const parentNode = nodes.find(node => node.id === currentNode.parentId)
+
+    if (hideEnv) {
+      return getNodeAvailableVars({
+        parentNode,
+        beforeNodes: uniqBy(availableNodes, 'id').filter(node => node.id !== nodeId),
+        isChatMode,
+        hideEnv,
+        hideChatVar: hideEnv,
+        filterVar,
+      })
+        .map(node => ({
+          ...node,
+          vars: node.isStartNode ? node.vars.filter(v => !v.variable.startsWith('sys.')) : node.vars,
+        }))
+        .filter(item => item.vars.length > 0)
+    }
+
+    return getNodeAvailableVars({
+      parentNode,
+      beforeNodes: uniqBy(availableNodes, 'id').filter(node => node.id !== nodeId),
+      isChatMode,
+      filterVar,
+    })
+  }, [nodes, getBeforeNodesInSameBranchIncludeParent, getNodeAvailableVars, isChatMode])
+
+  return getAvailableVars
+}
+
+export const useHandleAddOperationItem = () => {
+  return useCallback((list: any[]) => {
+    const newItem = {
+      variable_selector: [],
+      write_mode: WriteMode.overwrite,
+      input_type: AssignerNodeInputType.variable,
+      value: '',
+    }
+    return [...list, newItem]
+  }, [])
+}

web/app/components/workflow/nodes/assigner/node.tsx

@@ -15,31 +15,71 @@ const NodeComponent: FC<NodeProps<AssignerNodeType>> = ({
   const { t } = useTranslation()
 
   const nodes: Node[] = useNodes()
-  const { assigned_variable_selector: variable, write_mode: writeMode } = data
+  if (data.version === '2') {
+    const { items: operationItems } = data
+    const validOperationItems = operationItems?.filter(item =>
+      item.variable_selector && item.variable_selector.length > 0,
+    ) || []
+
+    if (validOperationItems.length === 0) {
+      return (
+        <div className='relative flex flex-col px-3 py-1 gap-0.5 items-start self-stretch'>
+          <div className='flex flex-col items-start gap-1 self-stretch'>
+            <div className='flex px-[5px] py-1 items-center gap-1 self-stretch rounded-md bg-workflow-block-parma-bg'>
+              <div className='flex-1 text-text-tertiary system-xs-medium'>{t(`${i18nPrefix}.varNotSet`)}</div>
+            </div>
+          </div>
+        </div>
+      )
+    }
+    return (
+      <div className='relative flex flex-col px-3 py-1 gap-0.5 items-start self-stretch'>
+        {operationItems.map((value, index) => {
+          const variable = value.variable_selector
+          if (!variable || variable.length === 0)
+            return null
+          const isSystem = isSystemVar(variable)
+          const isEnv = isENV(variable)
+          const isChatVar = isConversationVar(variable)
+          const node = isSystem ? nodes.find(node => node.data.type === BlockEnum.Start) : nodes.find(node => node.id === variable[0])
+          const varName = isSystem ? `sys.${variable[variable.length - 1]}` : variable.slice(1).join('.')
+          return (
+            <NodeVariableItem
+              key={index}
+              node={node as Node}
+              isEnv={isEnv}
+              isChatVar={isChatVar}
+              writeMode={value.operation}
+              varName={varName}
+              className='bg-workflow-block-parma-bg'
+            />
+          )
+        })}
+      </div>
+    )
+  }
+  // Legacy version
+  const { assigned_variable_selector: variable, write_mode: writeMode } = data as any
 
   if (!variable || variable.length === 0)
     return null
-
   const isSystem = isSystemVar(variable)
   const isEnv = isENV(variable)
   const isChatVar = isConversationVar(variable)
 
   const node = isSystem ? nodes.find(node => node.data.type === BlockEnum.Start) : nodes.find(node => node.id === variable[0])
   const varName = isSystem ? `sys.${variable[variable.length - 1]}` : variable.slice(1).join('.')
+
   return (
-    <div className='relative px-3'>
-      <div className='mb-1 system-2xs-medium-uppercase text-text-tertiary'>{t(`${i18nPrefix}.assignedVariable`)}</div>
+    <div className='relative flex flex-col px-3 py-1 gap-0.5 items-start self-stretch'>
       <NodeVariableItem
         node={node as Node}
         isEnv={isEnv}
         isChatVar={isChatVar}
         varName={varName}
+        writeMode={writeMode}
         className='bg-workflow-block-parma-bg'
       />
-      <div className='my-2 flex justify-between items-center h-[22px] px-[5px] bg-workflow-block-parma-bg radius-sm'>
-        <div className='system-xs-medium-uppercase text-text-tertiary'>{t(`${i18nPrefix}.writeMode`)}</div>
-        <div className='system-xs-medium text-text-secondary'>{t(`${i18nPrefix}.${writeMode}`)}</div>
-      </div>
     </div>
   )
 }

web/app/components/workflow/nodes/assigner/panel.tsx

@@ -1,15 +1,15 @@
 import type { FC } from 'react'
 import React from 'react'
 import { useTranslation } from 'react-i18next'
-
-import VarReferencePicker from '../_base/components/variable/var-reference-picker'
-import OptionCard from '../_base/components/option-card'
+import {
+  RiAddLine,
+} from '@remixicon/react'
+import VarList from './components/var-list'
 import useConfig from './use-config'
-import { WriteMode } from './types'
 import type { AssignerNodeType } from './types'
-import Field from '@/app/components/workflow/nodes/_base/components/field'
+import { useHandleAddOperationItem } from './hooks'
+import ActionButton from '@/app/components/base/action-button'
 import { type NodePanelProps } from '@/app/components/workflow/types'
-import cn from '@/utils/classnames'
 
 const i18nPrefix = 'workflow.nodes.assigner'
 
@@ -18,67 +18,48 @@ const Panel: FC<NodePanelProps<AssignerNodeType>> = ({
   data,
 }) => {
   const { t } = useTranslation()
-
+  const handleAddOperationItem = useHandleAddOperationItem()
   const {
     readOnly,
     inputs,
-    handleAssignedVarChanges,
-    isSupportAppend,
+    handleOperationListChanges,
+    getAssignedVarType,
+    getToAssignedVarType,
+    writeModeTypesNum,
+    writeModeTypesArr,
     writeModeTypes,
-    handleWriteModeChange,
     filterAssignedVar,
     filterToAssignedVar,
-    handleToAssignedVarChange,
-    toAssignedVarType,
   } = useConfig(id, data)
+  const handleAddOperation = () => {
+    const newList = handleAddOperationItem(inputs.items || [])
+    handleOperationListChanges(newList)
+  }
 
   return (
-    <div className='mt-2'>
-      <div className='px-4 pb-4 space-y-4'>
-        <Field
-          title={t(`${i18nPrefix}.assignedVariable`)}
-        >
-          <VarReferencePicker
-            readonly={readOnly}
-            nodeId={id}
-            isShowNodeName
-            value={inputs.assigned_variable_selector || []}
-            onChange={handleAssignedVarChanges}
-            filterVar={filterAssignedVar}
-          />
-        </Field>
-        <Field
-          title={t(`${i18nPrefix}.writeMode`)}
-        >
-          <div className={cn('grid gap-2 grid-cols-3')}>
-            {writeModeTypes.map(type => (
-              <OptionCard
-                key={type}
-                title={t(`${i18nPrefix}.${type}`)}
-                onSelect={handleWriteModeChange(type)}
-                selected={inputs.write_mode === type}
-                disabled={!isSupportAppend && type === WriteMode.Append}
-                tooltip={type === WriteMode.Append ? t(`${i18nPrefix}.writeModeTip`)! : undefined}
-              />
-            ))}
+    <div className='flex py-2 flex-col items-start self-stretch'>
+      <div className='flex flex-col justify-center items-start gap-1 px-4 py-2 w-full self-stretch'>
+        <div className='flex items-start gap-2 self-stretch'>
+          <div className='flex flex-col justify-center items-start flex-grow text-text-secondary system-sm-semibold-uppercase'>{t(`${i18nPrefix}.variables`)}</div>
+          <ActionButton onClick={handleAddOperation}>
+            <RiAddLine className='w-4 h-4 shrink-0 text-text-tertiary' />
+          </ActionButton>
         </div>
-        </Field>
-        {inputs.write_mode !== WriteMode.Clear && (
-          <Field
-            title={t(`${i18nPrefix}.setVariable`)}
-          >
-            <VarReferencePicker
+        <VarList
           readonly={readOnly}
           nodeId={id}
-              isShowNodeName
-              value={inputs.input_variable_selector || []}
-              onChange={handleToAssignedVarChange}
-              filterVar={filterToAssignedVar}
-              valueTypePlaceHolder={toAssignedVarType}
+          list={inputs.items || []}
+          onChange={(newList) => {
+            handleOperationListChanges(newList)
+          }}
+          filterVar={filterAssignedVar}
+          filterToAssignedVar={filterToAssignedVar}
+          getAssignedVarType={getAssignedVarType}
+          writeModeTypes={writeModeTypes}
+          writeModeTypesArr={writeModeTypesArr}
+          writeModeTypesNum={writeModeTypesNum}
+          getToAssignedVarType={getToAssignedVarType}
         />
-          </Field>
-        )}
-
       </div>
     </div>
   )

web/app/components/workflow/nodes/assigner/types.ts

@@ -1,13 +1,30 @@
 import type { CommonNodeType, ValueSelector } from '@/app/components/workflow/types'
 
 export enum WriteMode {
-  Overwrite = 'over-write',
-  Append = 'append',
-  Clear = 'clear',
+  overwrite = 'over-write',
+  clear = 'clear',
+  append = 'append',
+  extend = 'extend',
+  set = 'set',
+  increment = '+=',
+  decrement = '-=',
+  multiply = '*=',
+  divide = '/=',
+}
+
+export enum AssignerNodeInputType {
+  variable = 'variable',
+  constant = 'constant',
+}
+
+export type AssignerNodeOperation = {
+  variable_selector: ValueSelector
+  input_type: AssignerNodeInputType
+  operation: WriteMode
+  value: any
 }
 
 export type AssignerNodeType = CommonNodeType & {
-  assigned_variable_selector: ValueSelector
-  write_mode: WriteMode
-  input_variable_selector: ValueSelector
+  version?: '1' | '2'
+  items: AssignerNodeOperation[]
 }

web/app/components/workflow/nodes/assigner/use-config.ts

@@ -1,10 +1,12 @@
 import { useCallback, useMemo } from 'react'
 import produce from 'immer'
 import { useStoreApi } from 'reactflow'
-import { isEqual } from 'lodash-es'
 import { VarType } from '../../types'
 import type { ValueSelector, Var } from '../../types'
-import { type AssignerNodeType, WriteMode } from './types'
+import { WriteMode } from './types'
+import type { AssignerNodeOperation, AssignerNodeType } from './types'
+import { useGetAvailableVars } from './hooks'
+import { convertV1ToV2 } from './utils'
 import useNodeCrud from '@/app/components/workflow/nodes/_base/hooks/use-node-crud'
 import {
   useIsChatMode,
@@ -13,9 +15,20 @@ import {
   useWorkflowVariables,
 } from '@/app/components/workflow/hooks'
 
-const useConfig = (id: string, payload: AssignerNodeType) => {
+const useConfig = (id: string, rawPayload: AssignerNodeType) => {
+  const payload = useMemo(() => convertV1ToV2(rawPayload), [rawPayload])
   const { nodesReadOnly: readOnly } = useNodesReadOnly()
   const isChatMode = useIsChatMode()
+  const getAvailableVars = useGetAvailableVars()
+  const filterVar = (varType: VarType) => {
+    return (v: Var) => {
+      if (varType === VarType.any)
+        return true
+      if (v.type === VarType.any)
+        return true
+      return v.type === varType
+    }
+  }
 
   const store = useStoreApi()
   const { getBeforeNodesInSameBranch } = useWorkflow()
@@ -30,59 +43,41 @@ const useConfig = (id: string, payload: AssignerNodeType) => {
     return getBeforeNodesInSameBranch(id)
   }, [getBeforeNodesInSameBranch, id])
   const { inputs, setInputs } = useNodeCrud<AssignerNodeType>(id, payload)
+  const newSetInputs = useCallback((newInputs: AssignerNodeType) => {
+    const finalInputs = produce(newInputs, (draft) => {
+      if (draft.version !== '2')
+        draft.version = '2'
+    })
+    setInputs(finalInputs)
+  }, [setInputs])
 
   const { getCurrentVariableType } = useWorkflowVariables()
-  const assignedVarType = getCurrentVariableType({
+  const getAssignedVarType = useCallback((valueSelector: ValueSelector) => {
+    return getCurrentVariableType({
       parentNode: iterationNode,
-    valueSelector: inputs.assigned_variable_selector || [],
+      valueSelector: valueSelector || [],
       availableNodes,
       isChatMode,
       isConstant: false,
     })
+  }, [getCurrentVariableType, iterationNode, availableNodes, isChatMode])
 
-  const isSupportAppend = useCallback((varType: VarType) => {
-    return [VarType.arrayString, VarType.arrayNumber, VarType.arrayObject].includes(varType)
-  }, [])
-
-  const isCurrSupportAppend = useMemo(() => isSupportAppend(assignedVarType), [assignedVarType, isSupportAppend])
-
-  const handleAssignedVarChanges = useCallback((variable: ValueSelector | string) => {
+  const handleOperationListChanges = useCallback((items: AssignerNodeOperation[]) => {
     const newInputs = produce(inputs, (draft) => {
-      draft.assigned_variable_selector = variable as ValueSelector
-      draft.input_variable_selector = []
-
-      const newVarType = getCurrentVariableType({
-        parentNode: iterationNode,
-        valueSelector: draft.assigned_variable_selector || [],
-        availableNodes,
-        isChatMode,
-        isConstant: false,
+      draft.items = [...items]
     })
+    newSetInputs(newInputs)
+  }, [inputs, newSetInputs])
 
-      if (inputs.write_mode === WriteMode.Append && !isSupportAppend(newVarType))
-        draft.write_mode = WriteMode.Overwrite
-    })
-    setInputs(newInputs)
-  }, [inputs, setInputs, getCurrentVariableType, iterationNode, availableNodes, isChatMode, isSupportAppend])
+  const writeModeTypesArr = [WriteMode.overwrite, WriteMode.clear, WriteMode.append, WriteMode.extend]
+  const writeModeTypes = [WriteMode.overwrite, WriteMode.clear, WriteMode.set]
+  const writeModeTypesNum = [WriteMode.increment, WriteMode.decrement, WriteMode.multiply, WriteMode.divide]
 
-  const writeModeTypes = [WriteMode.Overwrite, WriteMode.Append, WriteMode.Clear]
-
-  const handleWriteModeChange = useCallback((writeMode: WriteMode) => {
-    return () => {
-      const newInputs = produce(inputs, (draft) => {
-        draft.write_mode = writeMode
-        if (inputs.write_mode === WriteMode.Clear)
-          draft.input_variable_selector = []
-      })
-      setInputs(newInputs)
-    }
-  }, [inputs, setInputs])
-
-  const toAssignedVarType = useMemo(() => {
-    const { write_mode } = inputs
-    if (write_mode === WriteMode.Overwrite)
+  const getToAssignedVarType = useCallback((assignedVarType: VarType, write_mode: WriteMode) => {
+    if (write_mode === WriteMode.overwrite || write_mode === WriteMode.increment || write_mode === WriteMode.decrement
+      || write_mode === WriteMode.multiply || write_mode === WriteMode.divide || write_mode === WriteMode.extend)
       return assignedVarType
-    if (write_mode === WriteMode.Append) {
+    if (write_mode === WriteMode.append) {
       if (assignedVarType === VarType.arrayString)
         return VarType.string
       if (assignedVarType === VarType.arrayNumber)
@@ -91,20 +86,18 @@ const useConfig = (id: string, payload: AssignerNodeType) => {
         return VarType.object
     }
     return VarType.string
-  }, [assignedVarType, inputs])
+  }, [])
 
   const filterAssignedVar = useCallback((varPayload: Var, selector: ValueSelector) => {
     return selector.join('.').startsWith('conversation')
   }, [])
 
-  const filterToAssignedVar = useCallback((varPayload: Var, selector: ValueSelector) => {
-    if (isEqual(selector, inputs.assigned_variable_selector))
-      return false
-
-    if (inputs.write_mode === WriteMode.Overwrite) {
+  const filterToAssignedVar = useCallback((varPayload: Var, assignedVarType: VarType, write_mode: WriteMode) => {
+    if (write_mode === WriteMode.overwrite || write_mode === WriteMode.extend || write_mode === WriteMode.increment
+      || write_mode === WriteMode.decrement || write_mode === WriteMode.multiply || write_mode === WriteMode.divide) {
       return varPayload.type === assignedVarType
     }
-    else if (inputs.write_mode === WriteMode.Append) {
+    else if (write_mode === WriteMode.append) {
       switch (assignedVarType) {
         case VarType.arrayString:
           return varPayload.type === VarType.string
@@ -117,27 +110,21 @@ const useConfig = (id: string, payload: AssignerNodeType) => {
       }
     }
     return true
-  }, [inputs.assigned_variable_selector, inputs.write_mode, assignedVarType])
-
-  const handleToAssignedVarChange = useCallback((value: ValueSelector | string) => {
-    const newInputs = produce(inputs, (draft) => {
-      draft.input_variable_selector = value as ValueSelector
-    })
-    setInputs(newInputs)
-  }, [inputs, setInputs])
+  }, [])
 
   return {
     readOnly,
     inputs,
-    handleAssignedVarChanges,
-    assignedVarType,
-    isSupportAppend: isCurrSupportAppend,
+    handleOperationListChanges,
+    getAssignedVarType,
+    getToAssignedVarType,
     writeModeTypes,
-    handleWriteModeChange,
+    writeModeTypesArr,
+    writeModeTypesNum,
     filterAssignedVar,
     filterToAssignedVar,
-    handleToAssignedVarChange,
-    toAssignedVarType,
+    getAvailableVars,
+    filterVar,
   }
 }
 

web/app/components/workflow/nodes/assigner/utils.ts

@@ -1,5 +1,83 @@
 import type { AssignerNodeType } from './types'
+import { AssignerNodeInputType, WriteMode } from './types'
 
 export const checkNodeValid = (payload: AssignerNodeType) => {
   return true
 }
+
+export const formatOperationName = (type: string) => {
+  if (type === 'over-write')
+    return 'Overwrite'
+  return type.charAt(0).toUpperCase() + type.slice(1)
+}
+
+type Item = {
+  value: string | number
+  name: string
+}
+
+export const getOperationItems = (
+  assignedVarType?: string,
+  writeModeTypes?: WriteMode[],
+  writeModeTypesArr?: WriteMode[],
+  writeModeTypesNum?: WriteMode[],
+): Item[] => {
+  if (assignedVarType?.startsWith('array') && writeModeTypesArr) {
+    return writeModeTypesArr.map(type => ({
+      value: type,
+      name: type,
+    }))
+  }
+
+  if (assignedVarType === 'number' && writeModeTypes && writeModeTypesNum) {
+    return [
+      ...writeModeTypes.map(type => ({
+        value: type,
+        name: type,
+      })),
+      { value: 'divider', name: 'divider' } as Item,
+      ...writeModeTypesNum.map(type => ({
+        value: type,
+        name: type,
+      })),
+    ]
+  }
+
+  if (writeModeTypes && ['string', 'object'].includes(assignedVarType || '')) {
+    return writeModeTypes.map(type => ({
+      value: type,
+      name: type,
+    }))
+  }
+
+  return []
+}
+
+const convertOldWriteMode = (oldMode: string): WriteMode => {
+  switch (oldMode) {
+    case 'over-write':
+      return WriteMode.overwrite
+    case 'append':
+      return WriteMode.append
+    case 'clear':
+      return WriteMode.clear
+    default:
+      return WriteMode.overwrite
+  }
+}
+
+export const convertV1ToV2 = (payload: any): AssignerNodeType => {
+  if (payload.version === '2' && payload.items)
+    return payload as AssignerNodeType
+
+  return {
+    version: '2',
+    items: [{
+      variable_selector: payload.assigned_variable_selector || [],
+      input_type: AssignerNodeInputType.variable,
+      operation: convertOldWriteMode(payload.write_mode),
+      value: payload.input_variable_selector || [],
+    }],
+    ...payload,
+  }
+}

web/app/components/workflow/nodes/variable-assigner/components/node-variable-item.tsx

@@ -1,9 +1,11 @@
 import { memo } from 'react'
+import { useTranslation } from 'react-i18next'
 import cn from '@/utils/classnames'
 import { VarBlockIcon } from '@/app/components/workflow/block-icon'
 import { Line3 } from '@/app/components/base/icons/src/public/common'
 import { Variable02 } from '@/app/components/base/icons/src/vender/solid/development'
 import { BubbleX, Env } from '@/app/components/base/icons/src/vender/line/others'
+import Badge from '@/app/components/base/badge'
 import type { Node } from '@/app/components/workflow/types'
 import { BlockEnum } from '@/app/components/workflow/types'
 
@@ -12,20 +14,26 @@ type NodeVariableItemProps = {
   isChatVar: boolean
   node: Node
   varName: string
+  writeMode?: string
   showBorder?: boolean
   className?: string
 }
+
+const i18nPrefix = 'workflow.nodes.assigner'
+
 const NodeVariableItem = ({
   isEnv,
   isChatVar,
   node,
   varName,
+  writeMode,
   showBorder,
   className,
 }: NodeVariableItemProps) => {
+  const { t } = useTranslation()
   return (
     <div className={cn(
-      'relative flex items-center mt-0.5 h-6 bg-gray-100 rounded-md  px-1 text-xs font-normal text-gray-700',
+      'relative flex items-center p-[3px] pl-[5px] gap-1 self-stretch rounded-md bg-workflow-block-param-bg',
       showBorder && '!bg-black/[0.02]',
       className,
     )}>
@@ -41,11 +49,19 @@ const NodeVariableItem = ({
           <Line3 className='mr-0.5'></Line3>
         </div>
       )}
-      <div className='flex items-center text-primary-600'>
+      <div className='flex items-center text-primary-600 w-full'>
         {!isEnv && !isChatVar && <Variable02 className='shrink-0 w-3.5 h-3.5 text-primary-500' />}
         {isEnv && <Env className='shrink-0 w-3.5 h-3.5 text-util-colors-violet-violet-600' />}
-        {isChatVar && <BubbleX className='w-3.5 h-3.5 text-util-colors-teal-teal-700' />}
-        <div className={cn('max-w-[75px] truncate ml-0.5 text-xs font-medium', (isEnv || isChatVar) && 'text-gray-900')} title={varName}>{varName}</div>
+        {!isChatVar && <div className={cn('max-w-[75px] truncate ml-0.5 system-xs-medium overflow-hidden text-ellipsis', isEnv && 'text-gray-900')} title={varName}>{varName}</div>}
+        {isChatVar
+          && <div className='flex items-center w-full gap-1'>
+            <div className='flex h-[18px] min-w-[18px] items-center gap-0.5 flex-1'>
+              <BubbleX className='w-3.5 h-3.5 text-util-colors-teal-teal-700' />
+              <div className='max-w-[75px] truncate ml-0.5 system-xs-medium overflow-hidden text-ellipsis text-util-colors-teal-teal-700'>{varName}</div>
+            </div>
+            {writeMode && <Badge className='shrink-0' text={t(`${i18nPrefix}.operations.${writeMode}`)} />}
+          </div>
+        }
       </div>
     </div>
   )

web/i18n/en-US/workflow.ts

@@ -260,6 +260,13 @@ const translation = {
     zoomTo100: 'Zoom to 100%',
     zoomToFit: 'Zoom to Fit',
   },
+  variableReference: {
+    noAvailableVars: 'No available variables',
+    noVarsForOperation: 'There are no variables available for assignment with the selected operation.',
+    noAssignedVars: 'No available assigned variables',
+    assignedVarsDescription: 'Assigned variables must be writable variables, such as ',
+    conversationVars: 'conversation variables',
+  },
   panel: {
     userInputField: 'User Input Field',
     changeBlock: 'Change Block',
@@ -491,6 +498,9 @@ const translation = {
     },
     assigner: {
       'assignedVariable': 'Assigned Variable',
+      'varNotSet': 'Variable NOT Set',
+      'variables': 'Variables',
+      'noVarTip': 'Click the "+" button to add variables',
       'writeMode': 'Write Mode',
       'writeModeTip': 'Append mode: Available for array variables only.',
       'over-write': 'Overwrite',
@@ -498,7 +508,24 @@ const translation = {
       'plus': 'Plus',
       'clear': 'Clear',
       'setVariable': 'Set Variable',
+      'selectAssignedVariable': 'Select assigned variable...',
+      'setParameter': 'Set parameter...',
+      'operations': {
+        'title': 'Operation',
+        'over-write': 'Overwrite',
+        'overwrite': 'Overwrite',
+        'set': 'Set',
+        'clear': 'Clear',
+        'extend': 'Extend',
+        'append': 'Append',
+        '+=': '+=',
+        '-=': '-=',
+        '*=': '*=',
+        '/=': '/=',
+      },
       'variable': 'Variable',
+      'noAssignedVars': 'No available assigned variables',
+      'assignedVarsDescription': 'Assigned variables must be writable variables, such as conversation variables.',
     },
     tool: {
       toAuthorize: 'To authorize',

web/i18n/zh-Hans/workflow.ts

@@ -225,7 +225,7 @@ const translation = {
     'code': '代码执行',
     'template-transform': '模板转换',
     'http-request': 'HTTP 请求',
-    'variable-assigner': '变量聚合器',
+    'variable-assigner': '变量赋值器',
     'variable-aggregator': '变量聚合器',
     'assigner': '变量赋值',
     'iteration-start': '迭代开始',
@@ -260,6 +260,13 @@ const translation = {
     zoomTo100: '放大到 100%',
     zoomToFit: '自适应视图',
   },
+  variableReference: {
+    noAvailableVars: '没有可用变量',
+    noVarsForOperation: '当前选择的操作没有可用的变量进行赋值。',
+    noAssignedVars: '没有可用的赋值变量',
+    assignedVarsDescription: '赋值变量必须是可写入的变量，例如：',
+    conversationVars: '会话变量',
+  },
   panel: {
     userInputField: '用户输入字段',
     changeBlock: '更改节点',
@@ -491,6 +498,8 @@ const translation = {
     },
     assigner: {
       'assignedVariable': '赋值的变量',
+      'varNotSet': '未设置变量',
+      'noVarTip': '点击 "+" 按钮添加变量',
       'writeMode': '写入模式',
       'writeModeTip': '使用追加模式时，赋值的变量必须是数组类型。',
       'over-write': '覆盖',
@@ -498,7 +507,25 @@ const translation = {
       'plus': '加',
       'clear': '清空',
       'setVariable': '设置变量',
+      'selectAssignedVariable': '选择要赋值的变量...',
+      'setParameter': '设置参数...',
+      'operations': {
+        'title': '操作',
+        'over-write': '覆盖',
+        'overwrite': '覆盖',
+        'set': '设置',
+        'clear': '清空',
+        'extend': '扩展',
+        'append': '追加',
+        '+=': '+=',
+        '-=': '-=',
+        '*=': '*=',
+        '/=': '/=',
+      },
       'variable': '变量',
+      'variables': '变量',
+      'noAssignedVars': '没有可用的赋值变量',
+      'assignedVarsDescription': '赋值变量必须是可写入的变量，例如会话变量。',
     },
     tool: {
       toAuthorize: '授权',