/**
 * A set multimap which forwards all its method calls to another set multimap. Subclasses should
 * override one or more methods to modify the behavior of the backing multimap as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code

 * service. Subclasses should override one or more methods to modify the behavior of the backing
 * executor service as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>{@code default} method warning:</b> This class does <i>not</i> forward calls to {@code

Par exemple, elle ne reçoit pas d'objets `datetime`, car ceux-ci ne sont pas compatibles avec JSON.

Ainsi, un objet `datetime` doit être converti en une `str` contenant les données au [format ISO](https://en.wikipedia.org/wiki/ISO_8601).

De la même manière, cette base de données n'accepterait pas un modèle Pydantic (un objet avec des attributs), seulement un `dict`.

Vous pouvez utiliser `jsonable_encoder` pour cela.

Por exemplo, ele não recebe objetos `datetime`, pois estes objetos não são compatíveis com JSON.

Então, um objeto `datetime` teria que ser convertido em um `str` contendo os dados no [formato ISO](https://en.wikipedia.org/wiki/ISO_8601).

Da mesma forma, este banco de dados não receberia um modelo Pydantic (um objeto com atributos), apenas um `dict`.

Você pode usar a função `jsonable_encoder` para resolver isso.

*Path operation function* içinde client'ın IP adresini/host'unu almak istediğinizi düşünelim.

Bunun için request'e doğrudan erişmeniz gerekir.

{* ../../docs_src/using_request_directly/tutorial001_py310.py hl[1,7:8] *}

Tipi `Request` olan bir *path operation function* parameter'ı tanımladığınızda **FastAPI**, o parameter'a `Request` nesnesini geçmesi gerektiğini anlar.

/// tip | İpucu

## 使用 `jsonable_encoder` { #using-the-jsonable-encoder }

想像你有一個只接受與 JSON 相容資料的資料庫 `fake_db`。

例如，它不接受 `datetime` 物件，因為那與 JSON 不相容。

因此，必須將 `datetime` 物件轉為一個以 [ISO 格式](https://en.wikipedia.org/wiki/ISO_8601) 表示資料的 `str`。

同樣地，這個資料庫不會接受 Pydantic 模型（帶有屬性的物件），只接受 `dict`。

你可以使用 `jsonable_encoder` 來處理。

它接收一個物件（例如 Pydantic 模型），並回傳一個與 JSON 相容的版本：

{* ../../docs_src/encoder/tutorial001_py310.py hl[4,21] *}

 * the methods for which signedness is not an issue are in {@link Bytes}.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/PrimitivesExplained">primitive utilities</a>.
 *
 * @author Kevin Bourrillion
 * @since 1.0
 */
// TODO(kevinb): how to prevent warning on UnsignedBytes when building GWT
// javadoc?
@GwtCompatible

**Pydantic v2** yayınlandığından beri, üretilen OpenAPI eskisine göre biraz daha net ve **doğru**. 😎

Hatta bazı durumlarda, aynı Pydantic model için OpenAPI içinde input ve output tarafında, **default değerler** olup olmamasına bağlı olarak **iki farklı JSON Schema** bile görebilirsiniz.

Bunun nasıl çalıştığına ve gerekirse nasıl değiştirebileceğinize bir bakalım.

## Input ve Output için Pydantic Modelleri { #pydantic-models-for-input-and-output }

/**
 * A cache which forwards all its method calls to another cache. Subclasses should override one or
 * more methods to modify the behavior of the backing cache as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p>Note that {@link #get}, {@link #getUnchecked}, and {@link #apply} all expose the same
 * underlying functionality, so should probably be overridden as a group.
 *

/**
 * A {@link ListenableFuture} which forwards all its method calls to another future. Subclasses
 * should override one or more methods to modify the behavior of the backing future as desired per
 * the <a href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>Warning:</b> The methods of {@code ForwardingListenableFuture} forward
 * <b>indiscriminately</b> to the methods of the delegate. For example, overriding {@link #get(long,