Por exemplo, `dependency_c` pode depender de `dependency_b`, e `dependency_b` depender de `dependency_a`:

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

E todas elas podem utilizar `yield`.

Neste caso, `dependency_c`, para executar seu código de saída, precisa que o valor de `dependency_b` (nomeado de `dep_b` aqui) continue disponível.

For example, `dependency_c` can have a dependency on `dependency_b`, and `dependency_b` on `dependency_a`:

{* ../../docs_src/dependencies/tutorial008_an_py39.py hl[6,14,22] *}

And all of them can use `yield`.

In this case `dependency_c`, to execute its exit code, needs the value from `dependency_b` (here named `dep_b`) to still be available.

```Python
item: Item = Body(embed=True)
```

as in:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}


In this case **FastAPI** will expect a body like:

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,

```Python
item: Item = Body(embed=True)
```

so wie in:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}

In diesem Fall erwartet **FastAPI** einen Body wie:

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,

```Python
item: Item = Body(embed=True)
```

так же, как в этом примере:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}

В этом случае **FastAPI** будет ожидать тело запроса в формате:

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",

Pydantic의 모델 구성을 사용하여 추가(`extra`) 필드를 금지(`forbid`)할 수 있습니다:

{* ../../docs_src/cookie_param_models/tutorial002_an_py39.py hl[10] *}

클라이언트가 **추가 쿠키**를 보내려고 시도하면, **오류** 응답을 받게 됩니다.

<abbr title="이건 또 다른 농담입니다. 제 말에 귀 기울이지 마세요. 커피랑 쿠키 좀 드세요. ☕">API가 거부</abbr>하는데도 동의를 얻기 위해 애쓰는 불쌍한 쿠키 배너(팝업)들. 🍪

Pydanticのモデルの Configuration を利用して、 `extra` フィールドを `forbid` とすることができます。

{* ../../docs_src/cookie_param_models/tutorial002_an_py39.py hl[10] *}

もしクライアントが**余分なクッキー**を送ろうとすると、**エラー**レスポンスが返されます。

```Python
item: Item = Body(embed=True)
```

como em:

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}

Neste caso o **FastAPI** esperará um corpo como:

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,

```Python
item: Item = Body(embed=True)
```

Voici un exemple complet :

{* ../../docs_src/body_multiple_params/tutorial005_an_py310.py hl[17] *}

Dans ce cas **FastAPI** attendra un body semblable à :

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,

# Get Current User { #get-current-user }

In the previous chapter the security system (which is based on the dependency injection system) was giving the *path operation function* a `token` as a `str`:

{* ../../docs_src/security/tutorial001_an_py39.py hl[12] *}

But that is still not that useful.

Let's make it give us the current user.

## Create a user model { #create-a-user-model }

First, let's create a Pydantic user model.