```JSON
{
    "name": "Foo",
    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...`description` et `tax` étant des attributs optionnels (avec `None` comme valeur par défaut), cet "objet" JSON serait aussi valide :

```JSON
{
    "name": "Foo",
    "price": 45.2
}
```

## Déclarez-le comme paramètre

```Python hl_lines="20"
{!../../../docs_src/body_nested_models/tutorial004.py!}
```

이는 **FastAPI**가 다음과 유사한 본문을 기대한다는 것을 의미합니다:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

```Python
    return {"item_name": item.name, "item_id": item_id}
```

...de:

```Python
        ... "item_name": item.name ...
```

...para:

```Python
        ... "item_price": item.price ...
```

...e veja como seu editor irá auto-completar os atributos e saberá os tipos:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

```Python
    return {"item_name": item.name, "item_id": item_id}
```

...bundan:

```Python
        ... "item_name": item.name ...
```

...buna:

```Python
        ... "item_price": item.price ...
```

...və redaktorun məlumat tiplərini bildiyini və avtomatik tamaladığını görəcəksiniz:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

```Python
    return {"item_name": item.name, "item_id": item_id}
```

...từ:

```Python
        ... "item_name": item.name ...
```

...sang:

```Python
        ... "item_price": item.price ...
```

...và thấy trình soạn thảo của bạn nhận biết kiểu dữ liệu và gợi ý hoàn thiện các thuộc tính.

![trình soạn thảo hỗ trợ](https://fastapi.tiangolo.com/img/vscode-completion.png)

Sie erhalten außerdem automatische Vervollständigung für die zu sendende Payload:

<img src="/img/tutorial/generate-clients/image03.png">

!!! tip "Tipp"
    Beachten Sie die automatische Vervollständigung für `name` und `price`, welche in der FastAPI-Anwendung im `Item`-Modell definiert wurden.

Sie erhalten Inline-Fehlerberichte für die von Ihnen gesendeten Daten:

<img src="/img/tutorial/generate-clients/image04.png">

    ```

This would mean that **FastAPI** would expect a body similar to:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

例えば、上記のモデルは以下の様なJSON「`オブジェクト`」(もしくはPythonの `dict` ) を宣言しています:

```JSON
{
    "name": "Foo",
    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...`description` と `tax` はオプショナル (デフォルト値は `None`) なので、以下のJSON「`オブジェクト`」も有効です:

```JSON
{
    "name": "Foo",
    "price": 45.2
}
```

## パラメータとして宣言

*パスオペレーション* に加えるために、パスパラメータやクエリパラメータと同じ様に宣言します:

```Python hl_lines="16"

```Python
    return {"item_name": item.name, "item_id": item_id}
```

...láti:

```Python
        ... "item_name": item.name ...
```

...ṣí:

```Python
        ... "item_price": item.price ...
```

.. kí o sì wo bí olóòtú rẹ yóò ṣe parí àwọn àbùdá náà fúnra rẹ̀, yóò sì mọ irúfẹ́ wọn:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

```Python
    return {"item_name": item.name, "item_id": item_id}
```

...以下を:

```Python
        ... "item_name": item.name ...
```

...以下のように:

```Python
        ... "item_price": item.price ...
```

...そして、エディタが属性を自動補完し、そのタイプを知る方法を確認してください。:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)