* `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;

```{ .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.

	"Upgrade Required":                http.StatusUpgradeRequired,
	"Precondition Required":           http.StatusPreconditionRequired,
	"Too Many Requests":               http.StatusTooManyRequests,
	"Request Header Fields Too Large": http.StatusRequestHeaderFieldsTooLarge,
	"Unavailable For Legal Reasons":   http.StatusUnavailableForLegalReasons,
	"Internal Server Error":           http.StatusInternalServerError,

	DeadlineMS uint32    // If non-zero, milliseconds until deadline (max 1193h2m47.295s, ~49 days)
	Handler    HandlerID // ID of handler if invoking a remote handler.
	Op         Op        // Operation. Other fields change based on this value.
	Flags      Flags     // Optional flags.
	Payload    []byte    // Optional payload.
}

// Flags is a set of flags set on a message.
type Flags uint8

            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);

		principalID = cred.ParentUser
	}

	// Success.
	m := map[string]string{
		"region":          region,
		"principalId":     principalID,
		"sourceIPAddress": handlers.GetSourceIP(r),
		// Add more fields here.
	}
	if rangeField := r.Header.Get(xhttp.Range); rangeField != "" {
		m["range"] = rangeField
	}

	if _, ok := r.Header[xhttp.MinIOSourceReplicationRequest]; ok {

   END OF TERMS AND CONDITIONS

   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "{}"
      replaced with your own identifying information. (Don't include
      the brackets!)  The text should be enclosed in the appropriate
      comment syntax for the file format. We also recommend that a

func (j *xlMetaV2Version) unmarshalV(v uint8, bts []byte) (o []byte, err error) {
	if v > xlMetaVersion {
		return bts, fmt.Errorf("unknown xlMetaVersion: %d", v)
	}

	// Clear omitempty fields:
	if j.ObjectV2 != nil && len(j.ObjectV2.PartIndices) > 0 {
		j.ObjectV2.PartIndices = j.ObjectV2.PartIndices[:0]
	}
	o, err = j.UnmarshalMsg(bts)