✨ Add support for Pydantic v2 (while keeping support for v1 if v2 is not available), including initial work by AntonDeMeester (#722)

Co-authored-by: Mohamed Farahat <farahats9@yahoo.com>
Co-authored-by: Stefan Borer <stefan.borer@gmail.com>
Co-authored-by: Peter Landry <peter.landry@gmail.com>
Co-authored-by: Anton De Meester <antondemeester+github@gmail.com>

tests/test_instance_no_args.py

@@ -1,19 +1,16 @@
 from typing import Optional
 
-from sqlalchemy import create_engine, select
-from sqlalchemy.orm import Session
-from sqlmodel import Field, SQLModel
+import pytest
+from pydantic import ValidationError
+from sqlmodel import Field, Session, SQLModel, create_engine, select
 
 
 def test_allow_instantiation_without_arguments(clear_sqlmodel):
-    class Item(SQLModel):
+    class Item(SQLModel, table=True):
         id: Optional[int] = Field(default=None, primary_key=True)
         name: str
         description: Optional[str] = None
 
-        class Config:
-            table = True
-
     engine = create_engine("sqlite:///:memory:")
     SQLModel.metadata.create_all(engine)
     with Session(engine) as db:
@@ -21,7 +18,18 @@ def test_allow_instantiation_without_arguments(clear_sqlmodel):
         item.name = "Rick"
         db.add(item)
         db.commit()
-        result = db.execute(select(Item)).scalars().all()
+        statement = select(Item)
+        result = db.exec(statement).all()
     assert len(result) == 1
     assert isinstance(item.id, int)
     SQLModel.metadata.clear()
+
+
+def test_not_allow_instantiation_without_arguments_if_not_table():
+    class Item(SQLModel):
+        id: Optional[int] = Field(default=None, primary_key=True)
+        name: str
+        description: Optional[str] = None
+
+    with pytest.raises(ValidationError):
+        Item()