Коли ви імпортуєте `Query`, `Path`, `Depends`, `Security` та інші з `fastapi`, це насправді функції, що повертають спеціальні класи.

///

## Використовуйте `SecurityScopes` { #use-securityscopes }

Тепер оновіть залежність `get_current_user`.

Вона використовується наведеними вище залежностями.

## 创建实例 { #create-an-instance }

我们可以这样创建该类的实例：

{* ../../docs_src/dependencies/tutorial011_an_py310.py hl[18] *}

这样就把依赖项“参数化”了，现在它内部带有属性 `checker.fixed_content` 的值 `"bar"`。

## 把实例作为依赖项 { #use-the-instance-as-a-dependency }

然后，我们可以在 `Depends(checker)` 中使用这个 `checker`，而不是 `Depends(FixedContentQueryChecker)`，因为依赖项是实例 `checker`，不是类本身。

解析依赖项时，**FastAPI** 会像这样调用 `checker`：

```Python
checker(q="somequery")

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

pkg debug/elf, method (*File) DynamicSymbols() ([]Symbol, error)
pkg debug/elf, var ErrNoSymbols error

# CL 106460044 debug/plan9obj, cmd/addr2line: on Plan 9 use a.out header, Aram Hăvărneanu <******@****.***>
pkg debug/plan9obj, type FileHeader struct, HdrSize uint64
pkg debug/plan9obj, type FileHeader struct, LoadAddress uint64

/// tip | İpucu

Kullandığınız tüm tag'ler için metadata eklemek zorunda değilsiniz.

///

### Tag'lerinizi kullanın { #use-your-tags }

*path operation*'larınızı (ve `APIRouter`'ları) farklı tag'lere atamak için `tags` parametresini kullanın:

{* ../../docs_src/metadata/tutorial004_py310.py hl[21,26] *}

/// info | Bilgi

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

      <span style="background-color:#007166"><font color="#D3D7CF"> tip </font></span>  Running in development mode, for production use:
             <b>fastapi run</b>

             Logs:

     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Will watch for changes in these directories:

      <span style="background-color:#007166"><font color="#D3D7CF"> tip </font></span>  Running in development mode, for production use:
             <b>fastapi run</b>

             Logs:

     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Will watch for changes in these directories:

/// tip | Tipp

Sie müssen nicht für alle von Ihnen verwendeten Tags Metadaten hinzufügen.

///

### Ihre Tags verwenden { #use-your-tags }

Verwenden Sie den Parameter `tags` mit Ihren *Pfadoperationen* (und `APIRouter`n), um diese verschiedenen Tags zuzuweisen:

{* ../../docs_src/metadata/tutorial004_py310.py hl[21,26] *}

/// info | Info