* stream.collect(MoreCollectors.onlyElement())}.
   *
   * @throws NoSuchElementException if the iterable is empty
   * @throws IllegalArgumentException if the iterable contains multiple elements
   */
  @ParametricNullness
  public static <T extends @Nullable Object> T getOnlyElement(Iterable<T> iterable) {
    return Iterators.getOnlyElement(iterable.iterator());
  }

  /**

   *         .addCopies(Bean.RED, 8)
   *         .addCopies(Bean.BLACK_EYED, 10)
   *         .build();
   * }
   *
   * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build
   * multiple multisets in series.
   *
   * @since 2.0
   */
  public static class Builder<E> extends ImmutableCollection.Builder<E> {
    final Multiset<E> contents;

    /**

Wenn Sie nicht wissen, was das ist, werden Sie in den [Sicherheitskapiteln](security/simple-oauth2.md#password-hashing){.internal-link target=_blank} lernen, was ein „Passworthash“ ist.

///

## Mehrere Modelle { #multiple-models }

Hier ist eine allgemeine Idee, wie die Modelle mit ihren Passwortfeldern aussehen könnten und an welchen Stellen sie verwendet werden:

///

## Без Pydantic { #without-pydantic }

Если вам это не знакомо, вы можете узнать про "хэш пароля" в [главах о безопасности](security/simple-oauth2.md#password-hashing){.internal-link target=_blank}.

///

## Множественные модели { #multiple-models }

Ниже изложена основная идея того, как могут выглядеть эти модели с полями для паролей, а также описаны места, где они используются:

   *         .putAll("several", 1, 2, 3)
   *         .putAll("many", 1, 2, 3, 4, 5)
   *         .build();
   * }
   *
   * <p>Builder instances can be reused; it is safe to call {@link #build} multiple times to build
   * multiple multimaps in series. Each multimap contains the key-value mappings in the previously
   * created multimaps.
   *
   * @since 2.0
   */
  @DoNotMock
  public static class Builder<K, V> {

///

## Combining information { #combining-information }

You can also combine response information from multiple places, including the `response_model`, `status_code`, and `responses` parameters.

Mas em muitos casos, você desejará executar vários processos de trabalho ao mesmo tempo.

### Processos Múltiplos - Trabalhadores { #multiple-processes-workers }

<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] *}