This would allow you to **re-use the model** in **multiple places** and also to declare validations and metadata for all the parameters at once. 😎

/// note

This is supported since FastAPI version `0.115.0`. 🤓

///

/// tip

This same technique applies to `Query`, `Cookie`, and `Header`. 😎

///

 *   <li><b>collision-resistant:</b> while the definition above requires making at least <i>some</i>
 *       token attempt, one measure of the quality of a hash function is <i>how well</i> it succeeds
 *       at this goal. Important note: it may be easy to achieve the theoretical minimum collision
 *       rate when using completely <i>random</i> sample input. The true test of a hash function is

    putEdge(N1, N1);
    assertThat(graph.outDegree(N1)).isEqualTo(1);
    putEdge(N1, N2);
    assertThat(graph.outDegree(N1)).isEqualTo(2);
  }

  // Stable order tests

  // Note: Stable order means that the ordering doesn't change between iterations and versions.
  // Ideally, the ordering in test should never be updated.
  @Test
  public void stableIncidentEdgeOrder_edges_returnsInStableOrder() {

FastAPI はそのモデルから JSON Schema を生成し、OpenAPI の適切な場所に含めます。

例えば、ステータスコード `404` と Pydantic モデル `Message` を持つ別のレスポンスを宣言するには、次のように書けます:

{* ../../docs_src/additional_responses/tutorial001_py310.py hl[18,22] *}

/// note | 備考

`JSONResponse` を直接返す必要がある点に注意してください。

///

/// info | 情報

`model` キーは OpenAPI の一部ではありません。

FastAPI はそこから Pydantic モデルを取得して JSON Schema を生成し、適切な場所に配置します。

適切な場所は次のとおりです:

bucket exists already # purge: false # # set versioning for # # bucket [true|false] # versioning: false # # set objectlocking for # # bucket [true|false] NOTE: versioning is enabled by default if you use locking # objectlocking: false # - name: bucket2 # policy: none # purge: false # versioning: true # # set objectlocking for # # bucket [true|false] NOTE: versioning is enabled by default if you use locking # objectlocking: false ## Additional Annotations for the Kubernetes Job makeBucketJob makeBucketJob:...

# # bucket [true|false] # versioning: false # remove this key if you do not want versioning feature # # set objectlocking for # # bucket [true|false] NOTE: versioning is enabled by default if you use locking # objectlocking: false # - name: bucket2 # policy: none # purge: false # versioning: true # # set objectlocking for # # bucket [true|false] NOTE: versioning is enabled by default if you use locking # objectlocking: false ## Additional Annotations for the Kubernetes Job makeBucketJob makeBucketJob:...

            UpgradeContext context = createMockContext();
            UpgradeResult result = strategy.doApply(context, pomMap);

            assertTrue(result.success(), "Plugin upgrade should succeed");
            // Note: POM may or may not be modified depending on whether upgrades are needed

            // Verify the plugin version was upgraded
            Editor editor = new Editor(document);
            Element root = editor.root();

///

## 声明模型属性 { #declare-model-attributes }

然后，使用 `Field` 定义模型的属性：

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[11:14] *}

`Field` 的工作方式和 `Query`、`Path`、`Body` 相同，参数也相同。

/// note | 技术细节

实际上，`Query`、`Path` 以及你接下来会看到的其它对象，会创建公共 `Param` 类的子类的对象，而 `Param` 本身是 Pydantic 中 `FieldInfo` 的子类。

Pydantic 的 `Field` 返回也是 `FieldInfo` 的类实例。

`Body` 直接返回的也是 `FieldInfo` 的子类的对象。后文还会介绍一些 `Body` 的子类。

			return true
		}
		x[t.Key] = struct{}{}
	}

	return false
}

// BySize returns true when sz satisfies a
// ObjectSizeLessThan/ObjectSizeGreaterthan or a logical AND of these predicates
// Note: And combines size and other predicates like Tags, Prefix, etc. This
// method applies exclusively to size predicates only.
func (a And) BySize(sz int64) bool {
	if a.ObjectSizeGreaterThan > 0 &&
		sz <= a.ObjectSizeGreaterThan {

 *     String name = header.getName();
 *     String value = header.getValue();
 *     boolean isValid = header.isValid();
 * </pre>
 *
 * <p>Note: The name should not be blank and the value should not be null for the header to be considered valid.</p>
 *
 * @see java.io.Serializable
 */
public class RequestHeader implements Serializable {