📝 Add source for examples for migration from Pydantic v1 to Pydantic v2

docs_src/pydantic_v1_in_v2/tutorial001_an.py

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+from typing import Union
+
+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: Union[str, None] = None
+    size: float

docs_src/pydantic_v1_in_v2/tutorial001_an_py310.py

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+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: str | None = None
+    size: float

docs_src/pydantic_v1_in_v2/tutorial002_an.py

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+from typing import Union
+
+from fastapi import FastAPI
+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: Union[str, None] = None
+    size: float
+
+
+app = FastAPI()
+
+
+@app.post("/items/")
+async def create_item(item: Item) -> Item:
+    return item

docs_src/pydantic_v1_in_v2/tutorial002_an_py310.py

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+from fastapi import FastAPI
+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: str | None = None
+    size: float
+
+
+app = FastAPI()
+
+
+@app.post("/items/")
+async def create_item(item: Item) -> Item:
+    return item

docs_src/pydantic_v1_in_v2/tutorial003_an.py

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+from typing import Union
+
+from fastapi import FastAPI
+from pydantic import BaseModel as BaseModelV2
+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: Union[str, None] = None
+    size: float
+
+
+class ItemV2(BaseModelV2):
+    name: str
+    description: Union[str, None] = None
+    size: float
+
+
+app = FastAPI()
+
+
+@app.post("/items/", response_model=ItemV2)
+async def create_item(item: Item):
+    return item

docs_src/pydantic_v1_in_v2/tutorial003_an_py310.py

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+from fastapi import FastAPI
+from pydantic import BaseModel as BaseModelV2
+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: str | None = None
+    size: float
+
+
+class ItemV2(BaseModelV2):
+    name: str
+    description: str | None = None
+    size: float
+
+
+app = FastAPI()
+
+
+@app.post("/items/", response_model=ItemV2)
+async def create_item(item: Item):
+    return item

docs_src/pydantic_v1_in_v2/tutorial004_an.py

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+from typing import Union
+
+from fastapi import FastAPI
+from fastapi.temp_pydantic_v1_params import Body
+from pydantic.v1 import BaseModel
+from typing_extensions import Annotated
+
+
+class Item(BaseModel):
+    name: str
+    description: Union[str, None] = None
+    size: float
+
+
+app = FastAPI()
+
+
+@app.post("/items/")
+async def create_item(item: Annotated[Item, Body(embed=True)]) -> Item:
+    return item

docs_src/pydantic_v1_in_v2/tutorial004_an_py310.py

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+from typing import Annotated
+
+from fastapi import FastAPI
+from fastapi.temp_pydantic_v1_params import Body
+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: str | None = None
+    size: float
+
+
+app = FastAPI()
+
+
+@app.post("/items/")
+async def create_item(item: Annotated[Item, Body(embed=True)]) -> Item:
+    return item

docs_src/pydantic_v1_in_v2/tutorial004_an_py39.py

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+from typing import Annotated, Union
+
+from fastapi import FastAPI
+from fastapi.temp_pydantic_v1_params import Body
+from pydantic.v1 import BaseModel
+
+
+class Item(BaseModel):
+    name: str
+    description: Union[str, None] = None
+    size: float
+
+
+app = FastAPI()
+
+
+@app.post("/items/")
+async def create_item(item: Annotated[Item, Body(embed=True)]) -> Item:
+    return item