# Dependências Globais { #global-dependencies }

Para alguns tipos de aplicação você pode querer adicionar dependências para toda a aplicação.

De forma semelhante a [adicionar `dependencies` aos *decoradores de operação de rota*](dependencies-in-path-operation-decorators.md), você pode adicioná-las à aplicação `FastAPI`.

Nesse caso, elas serão aplicadas a todas as *operações de rota* da aplicação:

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

{* ../../docs_src/dependencies/tutorial007_py310.py hl[3,5] *}

## `yield`を持つサブ依存関係 { #sub-dependencies-with-yield }

任意の大きさや形のサブ依存関係やサブ依存関係の「ツリー」を持つことができ、その中で`yield`を使用することができます。

**FastAPI** は、`yield`を持つ各依存関係の「終了コード」が正しい順番で実行されていることを確認します。

例えば、`dependency_c`は`dependency_b`に、そして`dependency_b`は`dependency_a`に依存することができます:

{* ../../docs_src/dependencies/tutorial008_an_py310.py hl[6,14,22] *}

# Sub-dependencies { #sub-dependencies }

You can create dependencies that have **sub-dependencies**.

They can be as **deep** as you need them to be.

**FastAPI** will take care of solving them.

## First dependency "dependable" { #first-dependency-dependable }

You could create a first dependency ("dependable") like:

{* ../../docs_src/dependencies/tutorial005_an_py310.py hl[8:9] *}

{* ../../docs_src/dependencies/tutorial008_an_py310.py hl[6,14,22] *}

И все они могут использовать `yield`.

В этом случае `dependency_c` для выполнения своего кода выхода нуждается в том, чтобы значение из `dependency_b` (здесь `dep_b`) всё ещё было доступно.

И, в свою очередь, `dependency_b` нуждается в том, чтобы значение из `dependency_a` (здесь `dep_a`) было доступно для её кода выхода.

# Advanced Dependencies { #advanced-dependencies }

## Parameterized dependencies { #parameterized-dependencies }

All the dependencies we have seen are a fixed function or class.

But there could be cases where you want to be able to set parameters on the dependency, without having to declare many different functions or classes.

Let's imagine that we want to have a dependency that checks if the query parameter `q` contains some fixed content.

# Dependencias Globales { #global-dependencies }

Para algunos tipos de aplicaciones, podrías querer agregar dependencias a toda la aplicación.

Similar a como puedes [agregar `dependencies` a los *path operation decorators*](dependencies-in-path-operation-decorators.md), puedes agregarlos a la aplicación de `FastAPI`.

En ese caso, se aplicarán a todas las *path operations* en la aplicación:

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

    private Project project;

    /**
     * <p>setUp.</p>
     */
    @BeforeEach
    void setUp() {
        Dependency dependency1 = new Dependency();
        dependency1.setArtifactId("dep1");
        Dependency dependency2 = new Dependency();
        dependency2.setArtifactId("dep2");

        project = new Project();
        project.setModelVersion("4.0.0");
        project.setGroupId("org.apache.maven");

# Testing Dependencies with Overrides { #testing-dependencies-with-overrides }

## Overriding dependencies during testing { #overriding-dependencies-during-testing }

There are some scenarios where you might want to override a dependency during testing.

You don't want the original dependency to run (nor any of the sub-dependencies it might have).

# Unterabhängigkeiten { #sub-dependencies }

Sie können Abhängigkeiten erstellen, die **Unterabhängigkeiten** haben.

Diese können so **tief** verschachtelt sein, wie nötig.

**FastAPI** kümmert sich darum, sie aufzulösen.

## Erste Abhängigkeit, „Dependable“ { #first-dependency-dependable }

Sie könnten eine erste Abhängigkeit („Dependable“) wie folgt erstellen:

{* ../../docs_src/dependencies/tutorial005_an_py310.py hl[8:9] *}

Beispielsweise kann `dependency_c` von `dependency_b` und `dependency_b` von `dependency_a` abhängen:

{* ../../docs_src/dependencies/tutorial008_an_py310.py hl[6,14,22] *}

Und alle können `yield` verwenden.

In diesem Fall benötigt `dependency_c` zum Ausführen seines Exit-Codes, dass der Wert von `dependency_b` (hier `dep_b` genannt) verfügbar ist.

Und wiederum benötigt `dependency_b` den Wert von `dependency_a` (hier `dep_a` genannt) für seinen Exit-Code.