✨ Do not allow invalid combinations of field parameters for columns and relationships, sa_column excludes sa_column_args, primary_key, nullable, etc. (#681)

* ♻️ Make sa_column exclusive, do not allow incompatible arguments, sa_column_args, primary_key, etc

* ✅ Add tests for new errors when incorrectly using sa_column

* ✅ Add tests for sa_column_args and sa_column_kwargs

* ♻️ Do not allow sa_relationship with sa_relationship_args or sa_relationship_kwargs

* ✅ Add tests for relationship errors

* ✅ Fix test for sa_column_args

tests/test_field_sa_relationship.py

@@ -0,0 +1,53 @@
+from typing import List, Optional
+
+import pytest
+from sqlalchemy.orm import relationship
+from sqlmodel import Field, Relationship, SQLModel
+
+
+def test_sa_relationship_no_args() -> None:
+    with pytest.raises(RuntimeError):
+
+        class Team(SQLModel, table=True):
+            id: Optional[int] = Field(default=None, primary_key=True)
+            name: str = Field(index=True)
+            headquarters: str
+
+            heroes: List["Hero"] = Relationship(
+                back_populates="team",
+                sa_relationship_args=["Hero"],
+                sa_relationship=relationship("Hero", back_populates="team"),
+            )
+
+        class Hero(SQLModel, table=True):
+            id: Optional[int] = Field(default=None, primary_key=True)
+            name: str = Field(index=True)
+            secret_name: str
+            age: Optional[int] = Field(default=None, index=True)
+
+            team_id: Optional[int] = Field(default=None, foreign_key="team.id")
+            team: Optional[Team] = Relationship(back_populates="heroes")
+
+
+def test_sa_relationship_no_kwargs() -> None:
+    with pytest.raises(RuntimeError):
+
+        class Team(SQLModel, table=True):
+            id: Optional[int] = Field(default=None, primary_key=True)
+            name: str = Field(index=True)
+            headquarters: str
+
+            heroes: List["Hero"] = Relationship(
+                back_populates="team",
+                sa_relationship_kwargs={"lazy": "selectin"},
+                sa_relationship=relationship("Hero", back_populates="team"),
+            )
+
+        class Hero(SQLModel, table=True):
+            id: Optional[int] = Field(default=None, primary_key=True)
+            name: str = Field(index=True)
+            secret_name: str
+            age: Optional[int] = Field(default=None, index=True)
+
+            team_id: Optional[int] = Field(default=None, foreign_key="team.id")
+            team: Optional[Team] = Relationship(back_populates="heroes")