Этого можно добиться, используя [`AfterValidator` Pydantic](https://docs.pydantic.dev/latest/concepts/validators/#field-after-validator) внутри `Annotated`.

/// tip | Совет

В Pydantic также есть [`BeforeValidator`](https://docs.pydantic.dev/latest/concepts/validators/#field-before-validator) и другие. 🤓

///

        // Verify the interface extends Serializable
        assertTrue(user instanceof java.io.Serializable);
    }

    @Test
    public void test_allFieldsCombination() {
        // Test with all fields populated
        String name = "complexUser";
        String[] roles = { "admin", "user", "viewer" };
        String[] groups = { "developers", "managers", "qa" };

We have 3 different things that we synchronize on.

#### Http2Connection

This lock guards internal state of each connection. This lock is never held for blocking operations. That means that we acquire the lock, read or write a few fields and release the lock. No I/O and no application-layer callbacks.

#### Http2Stream

  }

  private static final int ENDPOINT = -2;

  // TODO(user): predecessors and successors should be collocated (reducing cache misses).
  // Might also explore collocating all of [hash, next, predecessor, successor] fields of an
  // entry in a *single* long[], though that reduces the maximum size of the set by a factor of 2

  /**
   * Pointer to the predecessor of an entry in insertion order. ENDPOINT indicates a node is the

  }

  private static final int ENDPOINT = -2;

  // TODO(user): predecessors and successors should be collocated (reducing cache misses).
  // Might also explore collocating all of [hash, next, predecessor, successor] fields of an
  // entry in a *single* long[], though that reduces the maximum size of the set by a factor of 2

  /**
   * Pointer to the predecessor of an entry in insertion order. ENDPOINT indicates a node is the

 *   <li>TRACE</li>
 * </ul>
 *
 * <p>The Curl class also defines an enum {@link Method} which lists all supported HTTP methods.</p>
 *
 * <p>The temporary directory used by Curl is defined by the {@code tmpDir} field, which is initialized
 * to the system's temporary directory.</p>
 */
public class Curl {

    /**
     * The temporary directory used by Curl. It is initialized to the system's temporary directory.
     */

```JSON
{
  "detail": [
    {
      "type": "missing",
      "loc": [
        "query",
        "needy"
      ],
      "msg": "Field required",
      "input": null
    }
  ]
}
```

Comme `needy` est un paramètre requis, vous devez le définir dans l'URL :

```
http://127.0.0.1:8000/items/foo-item?needy=sooooneedy
```

///

### Aynı Uygulamada Pydantic v1 ve v2 { #pydantic-v1-and-v2-on-the-same-app }

Pydantic açısından, alanları (field) Pydantic v1 modelleriyle tanımlanmış bir Pydantic v2 modeli (ya da tersi) kullanmak **desteklenmez**.

```mermaid
graph TB
    subgraph "❌ Not Supported"
        direction TB
        subgraph V2["Pydantic v2 Model"]

### `StreamingResponse` { #streamingresponse }

接收一個 async 產生器或一般的產生器／疊代器（帶有 `yield` 的函式），並以串流方式傳送回應本文。

{* ../../docs_src/custom_response/tutorial007_py310.py hl[3,16] *}

/// note | 技術細節

一個 `async` 任務只能在抵達某個 `await` 時才能被取消。如果沒有 `await`，該產生器（帶有 `yield` 的函式）將無法被正確取消，甚至在請求取消後仍可能持續執行。

因為這個小範例不需要任何 `await` 陳述式，我們加入 `await anyio.sleep(0)`，讓事件迴圈有機會處理取消。

對於大型或無限的串流來說，這點更為重要。

    static final GetCheckedTypeValidator BEST_VALIDATOR = getBestValidator();

    enum WeakSetValidator implements GetCheckedTypeValidator {
      INSTANCE;

      /*
       * Static final fields are presumed to be fastest, based on our experience with
       * UnsignedBytesBenchmark. TODO(cpovirk): benchmark this
       */
      /*