<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## Actualizar la App con Múltiples Modelos { #update-the-app-with-multiple-models }

Ahora vamos a **refactorizar** un poco esta aplicación para aumentar la **seguridad** y la **versatilidad**.

Con cualquiera de los métodos anteriores se vería así en los `/docs`:

<img src="/img/tutorial/body-fields/image01.png">

### `Body` con múltiples `examples` { #body-with-multiple-examples }

Por supuesto, también puedes pasar múltiples `examples`:

{* ../../docs_src/schema_extra_example/tutorial004_an_py310.py hl[23:38] *}

Damit können Sie den WebSocket verbinden und dann Nachrichten senden und empfangen:

<img src="/img/tutorial/websockets/image05.png">

## Verbindungsabbrüche und mehrere Clients handhaben { #handling-disconnections-and-multiple-clients }

Wenn eine WebSocket-Verbindung geschlossen wird, löst `await websocket.receive_text()` eine `WebSocketDisconnect`-Exception aus, die Sie dann wie in folgendem Beispiel abfangen und behandeln können.

`Optional[str]` の`Optional` はFastAPIでは使用されていません（FastAPIは`str`の部分のみ使用します）。しかし、`Optional[str]` はエディタがコードのエラーを見つけるのを助けてくれます。

///

## Pydanticを使わない方法

   * all super-classes, that are annotated with {@code @Subscribe}. The cache is shared across all
   * instances of this class; this greatly improves performance if multiple EventBus instances are
   * created and objects of the same class are registered on all of them.
   */
  private static final LoadingCache<Class<?>, ImmutableList<Method>> subscriberMethodsCache =

  private final Set<Feature<?>> features = new LinkedHashSet<>();

  /**
   * Configures this builder to produce tests appropriate for the given features. This method may be
   * called more than once to add features in multiple groups.
   */
  @CanIgnoreReturnValue
  public B withFeatures(Feature<?>... features) {
    return withFeatures(asList(features));
  }

  @CanIgnoreReturnValue

*   Fixes multiple `CHECK`-failures during Grappler's `IsSimplifiableReshape`
    ([CVE-2022-23581](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23581))
*   Fixes multiple `CHECK`-failures during Grappler's `SafeToRemoveIdentity`
    ([CVE-2022-23579](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23579))
*   Fixes multiple `CHECK`-failures in `TensorByteSize`

  private final Set<Feature<?>> features = new LinkedHashSet<>();

  /**
   * Configures this builder to produce tests appropriate for the given features. This method may be
   * called more than once to add features in multiple groups.
   */
  @CanIgnoreReturnValue
  public B withFeatures(Feature<?>... features) {
    return withFeatures(asList(features));
  }

  @CanIgnoreReturnValue

///

## Несколько воркеров { #multiple-workers }

Можно запустить несколько воркеров с помощью опции командной строки `--workers`:

//// tab | `fastapi`

Если вы используете команду `fastapi`:

<div class="termy">

```console

### Ein Load Balancer – mehrere Workercontainer { #one-load-balancer-multiple-worker-containers }