# Global Dependencies { #global-dependencies }

Bazı uygulama türlerinde, tüm uygulama için dependency eklemek isteyebilirsiniz.

[`dependencies`'i *path operation decorator*'larına ekleyebildiğiniz](dependencies-in-path-operation-decorators.md) gibi, `FastAPI` uygulamasına da ekleyebilirsiniz.

Bu durumda, uygulamadaki tüm *path operation*'lara uygulanırlar:

{* ../../docs_src/dependencies/tutorial012_an_py310.py hl[17] *}

Está diseñado para ser muy simple de usar, y para hacer que cualquier desarrollador integre otros componentes con **FastAPI** de forma muy sencilla.

## Qué es la "Inyección de Dependencias" { #what-is-dependency-injection }

**"Inyección de Dependencias"** significa, en programación, que hay una manera para que tu código (en este caso, tus *path operation functions*) declare las cosas que necesita para funcionar y utilizar: "dependencias".

* parent class
* subclass
* child class
* sibling class
* class method

* header
* headers
* authorization header
* `Authorization` header
* forwarded header

* dependency injection system
* dependency
* dependable
* dependant

* I/O bound
* CPU bound
* concurrency
* parallelism
* multiprocessing

* env var
* environment variable
* `PATH`
* `PATH` variable

            Doc(
                """
                A dictionary with overrides for the dependencies.

                Each key is the original dependency callable, and the value is the
                actual dependency that should be called.

                This is for testing, to replace expensive dependencies with testing
                versions.

                Read more about it in the

* die Kindklasse
* die Geschwisterklasse
* die Klassenmethode

* der Header
* die Header
* der Autorisierungsheader
* der `Authorization`-Header
* der Forwarded-Header

* das Dependency-Injection-System
* die Dependency
* das Dependable
* der Dependant

* I/O-lastig
* CPU-lastig
* Nebenläufigkeit
* Parallelität
* Multiprocessing

* die Umgebungsvariable
* die Umgebungsvariable

        QueryContext context = queryHelper.build(SearchRequestType.ADMIN_SEARCH, "test", ctx -> {
            // Admin search should not add virtual host filter
            ctx.skipRoleQuery(); // Skip role query to avoid complex dependency issues
        });

        assertNotNull(context);
    }

    @Test
    public void test_buildRoleQuery_emptyRoleSet() {
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

Esse sistema foi pensado para ser fácil de usar, e permitir que qualquer desenvolvedor possa integrar facilmente outros componentes ao **FastAPI**.

## O que é "Injeção de Dependência" { #what-is-dependency-injection }

{* ../../docs_src/security/tutorial002_an_py310.py hl[5,12:6] *}

## Crear una dependencia `get_current_user` { #create-a-get-current-user-dependency }

Vamos a crear una dependencia `get_current_user`.

¿Recuerdas que las dependencias pueden tener sub-dependencias?

`get_current_user` tendrá una dependencia con el mismo `oauth2_scheme` que creamos antes.

# 依赖项 { #dependencies }

**FastAPI** 提供了简单直观但功能强大的**<dfn title="也称为：组件、资源、提供者、服务、可注入项">依赖注入</dfn>**系统。

它被设计得非常易用，能让任何开发者都能轻松把其他组件与 **FastAPI** 集成。

## 什么是「依赖注入」 { #what-is-dependency-injection }

在编程中，**「依赖注入」**指的是，你的代码（本文中为*路径操作函数*）声明其运行所需并要使用的东西：“依赖”。

然后，由该系统（本文中为 **FastAPI**）负责执行所有必要的逻辑，为你的代码提供这些所需的依赖（“注入”依赖）。

当你需要以下内容时，这非常有用：

* 共享业务逻辑（同一段代码逻辑反复复用）
* 共享数据库连接
* 实施安全、认证、角色权限等要求
* 以及更多其他内容...

同时尽量减少代码重复。

then asking for the old pre-Go 1.21 `panic(nil)` behavior and the
new Go 1.23 `asynctimerchan=0` behavior.

Only the work module's `go.mod` is consulted for `godebug` directives.
Any directives in required dependency modules are ignored.
It is an error to list a `godebug` with an unrecognized setting.
(Toolchains older than Go 1.23 reject all `godebug` lines, since they do not