* `Field(primary_key=True)` informa ao SQLModel que o `id` é a **chave primária** no banco de dados SQL (você pode aprender mais sobre chaves primárias SQL na documentação do SQLModel).

    Ao ter o tipo como `int | None`, o SQLModel saberá que essa coluna deve ser um `INTEGER` no banco de dados SQL e que ela deve ser `NULLABLE`.

   * constructor calls (as does readObject()).
   */
  @SuppressWarnings("nullness:initialization.field.uninitialized") // For J2KT (see above)
  private transient @Nullable BiEntry<K, V>[] hashTableKToV;

  @SuppressWarnings("nullness:initialization.field.uninitialized") // For J2KT (see above)
  private transient @Nullable BiEntry<K, V>[] hashTableVToK;

         * 
         * If signing is not active, the SecuritySignature field of the SMB Header for all messages sent, except
         * the SMB_COM_SESSION_SETUP_ANDX Response (section 2.2.4.53.2), MUST be set to
         * 0x0000000000000000. For the SMB_COM_SESSION_SETUP_ANDX Response, the SecuritySignature
         * field of the SMB Header SHOULD<226> be set to the SecuritySignature received in the

    input.addListener(future, rejectionPropagatingExecutor(executor, future));
    return future;
  }

  /*
   * In certain circumstances, this field might theoretically not be visible to an afterDone() call
   * triggered by cancel(). For details, see the comments on the fields of TimeoutFuture.
   */
  @CheckForNull @LazyInit ListenableFuture<? extends V> inputFuture;
  @CheckForNull @LazyInit Class<X> exceptionType;

in this list response. If the list request contained label or field selectors, then the number of remaining items is unknown and the field will be left unset and omitted during serialization. If the list is complete (either because it is not chunking or because this is the last chunk), then there are no more remaining items and this field will be left unset and omitted during serialization. Servers older than v1.15 do not set this field. The intended use of the remainingItemCount is *estimating* the...

            addFieldToSource(sourceMap, "x121Address", x121Address);
        }
        return sourceMap;
    }

    protected void addFieldToSource(Map<String, Object> sourceMap, String field, Object value) {
        sourceMap.put(field, value);
    }

    // ===================================================================================
    //                                                                      Basic Override

}

// MetricSpec specifies how to scale based on a single metric
// (only `type` and one other matching field should be set at once).
message MetricSpec {
  // type is the type of metric source.  It should be one of "ContainerResource",
  // "External", "Object", "Pods" or "Resource", each mapping to a matching field in the object.
  // Note: "ContainerResource" type is available on when the feature-gate
  // HPAContainerMetrics is enabled

```{ .python .annotate hl_lines="1  5  8-11  14-17  23-25  28" }
{!../../docs_src/dataclasses/tutorial003.py!}
```

1. Wir importieren `field` weiterhin von Standard-`dataclasses`.

2. `pydantic.dataclasses` ist ein direkter Ersatz für `dataclasses`.

3. Die Datenklasse `Author` enthält eine Liste von `Item`-Datenklassen.

In that case, you can simply swap the standard `dataclasses` with `pydantic.dataclasses`, which is a drop-in replacement:

{* ../../docs_src/dataclasses/tutorial003.py hl[1,5,8:11,14:17,23:25,28] *}

1. We still import `field` from standard `dataclasses`.

2. `pydantic.dataclasses` is a drop-in replacement for `dataclasses`.

3. The `Author` dataclass includes a list of `Item` dataclasses.

            queryRequestBuilder.setQuery(QueryBuilders.matchAllQuery());
            final TermsAggregationBuilder termsBuilder = AggregationBuilders.terms(fessConfig.getIndexFieldSegment())
                    .field(fessConfig.getIndexFieldSegment()).size(maxSessionIdsInList).order(BucketOrder.key(false));
            queryRequestBuilder.addAggregation(termsBuilder);
            queryRequestBuilder.setPreference(Constants.SEARCH_PREFERENCE_LOCAL);