İstediğiniz kadar derin iç içe modeller tanımlayabilirsiniz:

{* ../../docs_src/body_nested_models/tutorial007_py310.py hl[7,12,18,21,25] *}

/// info | Bilgi

`Offer`’ın bir `Item` list’i olduğuna, `Item`’ların da opsiyonel bir `Image` list’ine sahip olduğuna dikkat edin.

///

## Sadece list olan body’ler { #bodies-of-pure-lists }

                                </a>
                                <c:forEach var="item" varStatus="s" items="${pathItems}">
                                    / <span><a
                                        href="${contextPath}/admin/storage/list/${f:u(item.id)}/">${f:h(item.name)}</a></span>
                                </c:forEach>

Esto significa:

* La variable `prices` es un `dict`:
    * Las claves de este `dict` son del tipo `str` (digamos, el nombre de cada ítem).
    * Los valores de este `dict` son del tipo `float` (digamos, el precio de cada ítem).

#### Union { #union }

Puedes declarar que una variable puede ser cualquiera de **varios tipos**, por ejemplo, un `int` o un `str`.

                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item"><la:link href="/admin/crawlinginfo">
                                <la:message key="labels.joblog_link_list"/>
                            </la:link></li>
                            <li class="breadcrumb-item active"><la:message
                                    key="labels.joblog_link_details"/></li>
                        </ol>

     * Returns the last ExecutionPlanItem in the supplied phase. If no items are in the specified phase,
     * the closest executionPlanItem from an earlier phase item will be returned.
     *
     * @param requestedPhase the requested phase
     *                       The execution plan item
     * @return The ExecutionPlanItem or null if none can be found
     */
    public ExecutionPlanItem findLastInPhase(String requestedPhase) {

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[1:25] hl[4,22] *}

Yield edilen her öğe JSON olarak kodlanır ve bir SSE olayının `data:` alanında gönderilir.

Dönüş tipini `AsyncIterable[Item]` olarak bildirirseniz, FastAPI bunu Pydantic ile veriyi **doğrulamak**, **belgelemek** ve **serileştirmek** için kullanır.

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[1:25] hl[10:12,23] *}

/// tip | İpucu

Каждый возвращаемый через `yield` элемент кодируется как JSON и отправляется в поле `data:` события SSE.

Если вы объявите тип возврата как `AsyncIterable[Item]`, FastAPI будет использовать его, чтобы выполнить **валидацию**, добавить **документацию** и **сериализовать** данные с помощью Pydantic.

{* ../../docs_src/server_sent_events/tutorial001_py310.py ln[1:25] hl[10:12,23] *}

    }
  }

  @Override
  final Iterator<E> elementIterator() {
    return new Itr<E>() {
      @Override
      @ParametricNullness
      E result(int entryIndex) {
        return backingMap.getKey(entryIndex);
      }
    };
  }

  @Override
  final Iterator<Entry<E>> entryIterator() {
    return new Itr<Entry<E>>() {
      @Override
      Entry<E> result(int entryIndex) {

    Random r = new Random(9);
    for (int i = 0; i < ITERS; i++) {
      countRemaps(r.nextLong(), map);
    }
    for (int shard = 2; shard <= MAX_SHARDS; shard++) {
      // Rough: don't exceed 1.2x the expected number of remaps by more than 20
      assertThat((double) map.get(shard)).isAtMost(1.2 * ITERS / shard + 20);
    }
  }

        }
        RenderDataUtil.register(data, "webConfigItems", itemList);
    }

    /**
     * Creates a map item with label and value for use in dropdown lists and form options.
     *
     * @param label the display label for the item
     * @param value the value associated with the item
     * @return a map containing the label and value
     */