🐛 Fix enum type checks ordering in get_sqlalchemy_type (#669)

Co-authored-by: Pierre Cheynier <p.cheynier@criteo.com>

sqlmodel/main.py

@@ -384,6 +384,9 @@ class SQLModelMetaclass(ModelMetaclass, DeclarativeMeta):
 
 def get_sqlalchemy_type(field: ModelField) -> Any:
     if isinstance(field.type_, type) and field.shape == SHAPE_SINGLETON:
+        # Check enums first as an enum can also be a str, needed by Pydantic/FastAPI
+        if issubclass(field.type_, Enum):
+            return sa_Enum(field.type_)
         if issubclass(field.type_, str):
             if field.field_info.max_length:
                 return AutoString(length=field.field_info.max_length)
@@ -402,8 +405,6 @@ def get_sqlalchemy_type(field: ModelField) -> Any:
             return Interval
         if issubclass(field.type_, time):
             return Time
-        if issubclass(field.type_, Enum):
-            return sa_Enum(field.type_)
         if issubclass(field.type_, bytes):
             return LargeBinary
         if issubclass(field.type_, Decimal):

tests/test_enums.py

@@ -14,12 +14,12 @@ Associated issues:
 """
 
 
-class MyEnum1(enum.Enum):
+class MyEnum1(str, enum.Enum):
     A = "A"
     B = "B"
 
 
-class MyEnum2(enum.Enum):
+class MyEnum2(str, enum.Enum):
     C = "C"
     D = "D"
 
@@ -70,3 +70,43 @@ def test_sqlite_ddl_sql(capsys):
     captured = capsys.readouterr()
     assert "enum_field VARCHAR(1) NOT NULL" in captured.out
     assert "CREATE TYPE" not in captured.out
+
+
+def test_json_schema_flat_model():
+    assert FlatModel.schema() == {
+        "title": "FlatModel",
+        "type": "object",
+        "properties": {
+            "id": {"title": "Id", "type": "string", "format": "uuid"},
+            "enum_field": {"$ref": "#/definitions/MyEnum1"},
+        },
+        "required": ["id", "enum_field"],
+        "definitions": {
+            "MyEnum1": {
+                "title": "MyEnum1",
+                "description": "An enumeration.",
+                "enum": ["A", "B"],
+                "type": "string",
+            }
+        },
+    }
+
+
+def test_json_schema_inherit_model():
+    assert InheritModel.schema() == {
+        "title": "InheritModel",
+        "type": "object",
+        "properties": {
+            "id": {"title": "Id", "type": "string", "format": "uuid"},
+            "enum_field": {"$ref": "#/definitions/MyEnum2"},
+        },
+        "required": ["id", "enum_field"],
+        "definitions": {
+            "MyEnum2": {
+                "title": "MyEnum2",
+                "description": "An enumeration.",
+                "enum": ["C", "D"],
+                "type": "string",
+            }
+        },
+    }