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):

В этом случае, если вы сделаете запрос:

```
http://127.0.0.1:8000/items/foo?short=1
```

или

```
http://127.0.0.1:8000/items/foo?short=True
```

или

```
http://127.0.0.1:8000/items/foo?short=true
```

или

```
http://127.0.0.1:8000/items/foo?short=on
```

или

```
http://127.0.0.1:8000/items/foo?short=yes
```

## Pathのインポート

まず初めに、`fastapi`から`Path`をインポートします:

{* ../../docs_src/path_params_numeric_validations/tutorial001.py hl[1] *}

## メタデータの宣言

パラメータは`Query`と同じものを宣言することができます。

例えば、パスパラメータ`item_id`に対して`title`のメタデータを宣言するには以下のようにします:

{* ../../docs_src/path_params_numeric_validations/tutorial001.py hl[8] *}

/// note | 備考

パスの一部でなければならないので、パスパラメータは常に必須です。

そのため、`...`を使用して必須と示す必要があります。

    client = TestClient(mod.app)
    return client


def test_get_custom_response(client: TestClient):
    response = client.get("/items/")
    assert response.status_code == 200, response.text
    assert response.json() == [{"item_id": "Foo"}]


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text

///

## Another module with `APIRouter` { #another-module-with-apirouter }

Let's say you also have the endpoints dedicated to handling "items" from your application in the module at `app/routers/items.py`.

You have *path operations* for:

* `/items/`
* `/items/{item_id}`

It's all the same structure as with `app/routers/users.py`.

But we want to be smarter and simplify the code a bit.

Avec ce code, en allant sur :

```
http://127.0.0.1:8000/items/foo?short=1
```

ou

```
http://127.0.0.1:8000/items/foo?short=True
```

ou

```
http://127.0.0.1:8000/items/foo?short=true
```

ou

```
http://127.0.0.1:8000/items/foo?short=on
```

ou

```
http://127.0.0.1:8000/items/foo?short=yes
```

Nesse caso, se você for para:

```
http://127.0.0.1:8000/items/foo?short=1
```

ou

```
http://127.0.0.1:8000/items/foo?short=True
```

ou

```
http://127.0.0.1:8000/items/foo?short=true
```

ou

```
http://127.0.0.1:8000/items/foo?short=on
```

ou

```
http://127.0.0.1:8000/items/foo?short=yes
```

En este caso, si vas a:

```
http://127.0.0.1:8000/items/foo?short=1
```

o

```
http://127.0.0.1:8000/items/foo?short=True
```

o

```
http://127.0.0.1:8000/items/foo?short=true
```

o

```
http://127.0.0.1:8000/items/foo?short=on
```

o

```
http://127.0.0.1:8000/items/foo?short=yes
```

이 경우, 아래로 이동하면:

```
http://127.0.0.1:8000/items/foo?short=1
```

또는

```
http://127.0.0.1:8000/items/foo?short=True
```

또는

```
http://127.0.0.1:8000/items/foo?short=true
```

또는

```
http://127.0.0.1:8000/items/foo?short=on
```

또는

```
http://127.0.0.1:8000/items/foo?short=yes
```

///

Bunun anlamı şudur: "`items` değişkeni bir `list`tir ve bu listedeki öğelerin her biri bir `str`dir".

Bunu yaparak, düzenleyicinizin listedeki öğeleri işlerken bile destek sağlamasını sağlayabilirsiniz:

<img src="/img/python-types/image05.png">

Tip belirteçleri olmadan, bunu başarmak neredeyse imkansızdır.

`item` değişkeninin `items` listesindeki öğelerden biri olduğuna dikkat edin.