{* ../../docs_src/pydantic_v1_in_v2/tutorial003_an_py310.py hl[2:3,6,12,21:22] *}

Im obigen Beispiel ist das Eingabemodell ein Pydantic‑v1‑Modell, und das Ausgabemodell (definiert in `response_model=ItemV2`) ist ein Pydantic‑v2‑Modell.

### Pydantic v1 Parameter { #pydantic-v1-parameters }

    return item


def dependency(item2: Item):
    return item2


def sub_duplicate_dependency(
    item: Item, sub_item: Item = Depends(duplicate_dependency)
):
    return [item, sub_item]


@app.post("/with-duplicates")
async def with_duplicates(item: Item, item2: Item = Depends(duplicate_dependency)):
    return [item, item2]


@app.post("/no-duplicates")

        item_id: str = Path(
            examples=["item_1", "item_2"],
        ),
    ):
        return item_id

    with pytest.warns(FastAPIDeprecationWarning):

        @app.get("/path_example_examples/{item_id}")
        def path_example_examples(
            item_id: str = Path(
                example="item_overridden",
                examples=["item_1", "item_2"],
            ),
        ):

                "summary": "Path One Summary",
                "description": "Path One Description",
                "value": "item_1",
            },
            "Path Two": {
                "value": "item_2",
            },
        },
    ),
):
    return item_id


@app.get("/query_examples/")
def query_examples(
    data: Union[str, None] = Query(
        default=None,
        examples=[

    assert response.json() == {
        "description": "All my friends drive a low rider",
        "type": "car",
    }


def test_get_plane(client: TestClient):
    response = client.get("/items/item2")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "description": "Music is my aeroplane, it's my aeroplane",
        "type": "plane",
        "size": 5,
    }

from pydantic.v1 import BaseModel


class Item(BaseModel):
    name: str
    description: str | None = None


class ItemV2(BaseModelV2):
    title: str
    summary: str | None = None


app = FastAPI()


@app.post("/items/", response_model=ItemV2)
def create_item(item: Item):
    return {"title": item.name, "summary": item.description}
```