```Python
# db._state = PeeweeConnectionState()
```

And in the file `sql_app/main.py` file, comment the body of the `async` dependency `reset_db_state()` and replace it with a `pass`:

```Python
async def reset_db_state():
#     database.db._state._state.set(db_state_default.copy())
#     database.db._state.reset()
    pass

* مستندسازی خودکار data model با <a href="https://json-schema.org/" class="external-link" target="_blank"><strong>JSON Schema</strong></a> (همانطور که OpenAPI خود نیز مبتنی بر JSON Schema است).

    - 如果驗證失敗，將會返回清楚有用的錯誤訊息。
- 查看 `GET` 請求中是否有命名為 `q` 的查詢參數 (例如 `http://127.0.0.1:8000/items/foo?q=somequery`)。
    - 因為 `q` 參數被宣告為 `= None`，所以是選填的。
    - 如果沒有宣告 `None`，則此參數將會是必填 (例如 `PUT` 範例的請求 body)。
- 對於 `PUT` 的請求 `/items/{item_id}`，將會讀取 body 為 JSON：
    - 驗證是否有必填屬性 `name` 且型別是 `str`。
    - 驗證是否有必填屬性 `price` 且型別是 `float`。
    - 驗證是否有選填屬性 `is_offer` 且型別是 `bool`。
    - 以上驗證都適用於多層次巢狀 JSON 物件。
- 自動轉換 JSON 格式。

```Python hl_lines="2  7  9"
{!../../../docs_src/custom_response/tutorial006c.py!}
```

### `StreamingResponse`

Takes an async generator or a normal generator/iterator and streams the response body.

```Python hl_lines="2  14"
{!../../../docs_src/custom_response/tutorial007.py!}
```

#### Using `StreamingResponse` with file-like objects

```JSON hl_lines="12-15"
{
  "detail": [
    {
      "loc": [
        "body",
        "size"
      ],
      "msg": "value is not a valid integer",
      "type": "type_error.integer"
    }
  ],
  "body": {
    "title": "towel",
    "size": "XL"
  }
}
```

#### `HTTPException` в FastAPI или в Starlette

        Prefer to use the `Annotated` version if possible.

    ```Python hl_lines="4  76"
    {!> ../../../docs_src/security/tutorial003.py!}
    ```

`OAuth2PasswordRequestForm` is a class dependency that declares a form body with:

* The `username`.
* The `password`.
* An optional `scope` field as a big string, composed of strings separated by spaces.
* An optional `grant_type`.

!!! tip

![ReDoc](https://fastapi.tiangolo.com/img/index/index-02-redoc-simple.png)

## Örneği Güncelleyelim

Şimdi `main.py` dosyasını, `PUT` isteğiyle birlikte bir gövde alacak şekilde değiştirelim.

<abbr title="Gövde: Body">Gövde</abbr>yi Pydantic sayesinde standart python tiplerini kullanarak tanımlayalım.

```Python hl_lines="4  9-12  25-27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

    "foo",
    "bar"
  ]
}
```

!!! tip
    To declare a query parameter with a type of `list`, like in the example above, you need to explicitly use `Query`, otherwise it would be interpreted as a request body.

The interactive API docs will update accordingly, to allow multiple values:

<img src="/img/tutorial/query-params-str-validations/image02.png">

### Query parameter list / multiple values with defaults

![ReDoc](https://fastapi.tiangolo.com/img/index/index-02-redoc-simple.png)

## 예제 심화

이제 `PUT` 요청에 있는 본문(Body)을 받기 위해 `main.py`를 수정해봅시다.

Pydantic을 이용해 파이썬 표준 타입으로 본문을 선언합니다.

```Python hl_lines="4  9 10 11 12  25 26 27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

![ReDoc](https://fastapi.tiangolo.com/img/index/index-02-redoc-simple.png)

## تغییر مثال

حال فایل `main.py` را مطابق زیر ویرایش کنید تا بتوانید <abbr title="Body">بدنه</abbr> یک درخواست `PUT` را دریافت کنید.

به کمک Pydantic بدنه درخواست را با <abbr title="Type">انواع</abbr> استاندارد پایتون تعریف کنید.

```Python hl_lines="4  9-12  25-27"
from typing import Optional