assertTrue(result instanceof DefaultQueryBuilder);

        // Verify query was processed
        // Note: Field logging behavior depends on implementation
    }

    @Test
    public void test_convertPhraseQuery_singleTerm_defaultField_dismax() {
        // Test with single term in default field with boost > 1
        PhraseQuery.Builder builder = new PhraseQuery.Builder();

func (z *ActiveWorkerStat) DecodeMsg(dc *msgp.Reader) (err error) {
	var field []byte
	_ = field
	var zb0001 uint32
	zb0001, err = dc.ReadMapHeader()
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	for zb0001 > 0 {
		zb0001--
		field, err = dc.ReadMapKeyPtr()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		switch msgp.UnsafeString(field) {
		case "Curr":
			z.Curr, err = dc.ReadInt()

与在*路径操作函数*中使用 `Query`、`Path` 、`Body` 声明校验与元数据的方式一样，可以使用 Pydantic 的 `Field` 在 Pydantic 模型内部声明校验和元数据。

## 导入 `Field` { #import-field }

首先，从 Pydantic 中导入 `Field`：

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}

/// warning | 警告

注意，与从 `fastapi` 导入 `Query`，`Path`、`Body` 不同，要直接从 `pydantic` 导入 `Field` 。

///

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

然后，使用 `Field` 定义模型的属性：

    yield ServerSentEvent(comment="just a comment")
    yield ServerSentEvent(data="retry-test", retry=5000)


@app.get("/items/stream-mixed", response_class=EventSourceResponse)
async def sse_items_mixed() -> AsyncIterable[Item]:
    yield items[0]
    yield ServerSentEvent(data="custom-event", event="special")
    yield items[1]


@app.get("/items/stream-string", response_class=EventSourceResponse)

                Field field = null;
                Class<?> clazz = this.getClass();
                while (clazz != null && field == null) {
                    try {
                        field = clazz.getDeclaredField(fieldName);
                    } catch (NoSuchFieldException e) {
                        clazz = clazz.getSuperclass();
                    }
                }
                if (field == null) {

## Імпорт `Field` { #import-field }

Спочатку вам потрібно імпортувати це:

{* ../../docs_src/body_fields/tutorial001_an_py310.py hl[4] *}


/// warning | Попередження

Зверніть увагу, що `Field` імпортується безпосередньо з `pydantic`, а не з `fastapi`, як усе інше (`Query`, `Path`, `Body` тощо).

///

				tx.AddError(rel.Field.Set(tx.Statement.Context, reflectValue.Index(i), reflect.MakeSlice(rel.Field.IndirectFieldType, 0, 10).Interface()))
			default:
				tx.AddError(rel.Field.Set(tx.Statement.Context, reflectValue.Index(i), reflect.New(rel.Field.FieldType).Interface()))
			}
		}
	}

	for i := 0; i < reflectResults.Len(); i++ {
		elem := reflectResults.Index(i)
		for idx, field := range relForeignFields {

## Stream JSON Lines

To stream JSON Lines, declare the return type and use `yield` to return the data.

```python
@app.get("/items/stream")
async def stream_items() -> AsyncIterable[Item]:
    for item in items:
        yield item
```

## Server-Sent Events (SSE)

To stream Server-Sent Events, use `response_class=EventSourceResponse` and `yield` items from the endpoint.

Подробнее читайте в документации: [Зависимости с `yield` — раннее завершение и `scope`](../tutorial/dependencies/dependencies-with-yield.md#early-exit-and-scope).

### Зависимости с `yield` и `StreamingResponse`, технические детали { #dependencies-with-yield-and-streamingresponse-technical-details }

    }

    // Test field assignment
    @Test
    public void test_fieldAssignment() {
        String[] fields = new String[] { "field1", "field2", "field3" };
        facetInfo.field = fields;
        assertNotNull(facetInfo.field);
        assertEquals(3, facetInfo.field.length);
        assertSame(fields, facetInfo.field);
    }