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}\n}\n\n/**\n * ------------------------------------------------------------------------\n * jQuery\n * ------------------------------------------------------------------------\n */\n\n$.fn[NAME]             = Toast._jQueryInterface\n$.fn[NAME].Constructor = Toast\n$.fn[NAME].noConflict  = () => {\n  $.fn[NAME] = JQUERY_NO_CONFLICT\n  return Toast._jQueryInterface\n}\n\nexport default Toast\n","import $ from 'jquery'\nimport Alert from './alert'\nimport Button from './button'\nimport Carousel from './carousel'\nimport...

n    ControlSidebar._jQueryInterface.call($(this), 'toggle')\n  })\n\n  /**\n   * jQuery API\n   * ====================================================\n   */\n\n  $.fn[NAME] = ControlSidebar._jQueryInterface\n  $.fn[NAME].Constructor = ControlSidebar\n  $.fn[NAME].noConflict  = function () {\n    $.fn[NAME] = JQUERY_NO_CONFLICT\n    return ControlSidebar._jQueryInterface\n  }\n\n  return ControlSidebar\n})(jQuery)\n\nexport default ControlSidebar\n  \n","/**\n * --------------------------------------------\n...

null\n    }\n\n    return Util.findShadowRoot(element.parentNode)\n  },\n\n  jQueryDetection() {\n    if (typeof $ === 'undefined') {\n      throw new TypeError('Bootstrap\\'s JavaScript requires jQuery. jQuery must be included before Bootstrap\\'s JavaScript.')\n    }\n\n    const version = $.fn.jquery.split(' ')[0].split('.')\n    const minMajor = 1\n    const ltMajor = 2\n    const minMinor = 9\n    const minPatch = 1\n    const maxMajor = 4\n\n    if (version[0] < ltMajor && version[1] < minMinor...

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```Python hl_lines="9"
{!../../../docs_src/query_params/tutorial002.py!}
```

この場合、関数パラメータ `q` はオプショナルとなり、デフォルトでは `None` になります。

!!! check "確認"
    パスパラメータ `item_id` はパスパラメータであり、`q` はそれとは違ってクエリパラメータであると判別できるほど**FastAPI** が賢いということにも注意してください。

## クエリパラメータの型変換

`bool` 型も宣言できます。これは以下の様に変換されます:

```Python hl_lines="9"
{!../../../docs_src/query_params/tutorial003.py!}
```

この場合、以下にアクセスすると:

```

q: Union[str, None] = None
```

Но у нас query-параметр определён как `Query`. Например:

=== "Annotated"

    ```Python
    q: Annotated[Union[str, None], Query(min_length=3)] = None
    ```

=== "без Annotated"

    ```Python
    q: Union[str, None] = Query(default=None, min_length=3)
    ```

Wie in:

```
http://127.0.0.1:8000/items/?item-query=foobaritems
```

Aber `item-query` ist kein gültiger Name für eine Variable in Python.

Am ähnlichsten wäre `item_query`.

Aber Sie möchten dennoch exakt `item-query` verwenden.

Dann können Sie einen `alias` deklarieren, und dieser Alias wird verwendet, um den Parameter-Wert zu finden:

=== "Python 3.10+"

### Importe `Query`

Para isso, primeiro importe `Query` de `fastapi`:

```Python hl_lines="3"
{!../../../docs_src/query_params_str_validations/tutorial002.py!}
```

## Use `Query` como o valor padrão

Agora utilize-o como valor padrão do seu parâmetro, definindo o parâmetro `max_length` para 50:

```Python hl_lines="9"
{!../../../docs_src/query_params_str_validations/tutorial002.py!}
```