key="labels.reqheader_web_crawling_config"/></th>
                                        <td><c:forEach var="item" items="${webConfigItems}">
                                            <c:if test="${webConfigId==item.value}">${f:h(item.label)}</c:if>
                                        </c:forEach> <la:hidden property="webConfigId"/></td>
                                    </tr>

    /** The key of the message: {item} must be false. */
    public static final String CONSTRAINTS_AssertFalse_MESSAGE = "{constraints.AssertFalse.message}";

    /** The key of the message: {item} must be true. */
    public static final String CONSTRAINTS_AssertTrue_MESSAGE = "{constraints.AssertTrue.message}";

    /** The key of the message: {item} must be less than {value}. */

@app.get("/items-header/{item_id}")
async def read_item_header(item_id: str):
    if item_id not in items:
        raise HTTPException(
            status_code=404,
            detail="Item not found",
            headers={"X-Error": "There goes my error"},
        )

from pydantic.v1 import BaseModel


class Item(BaseModel):
    name: str
    description: str | None = None
    size: float


class ItemV2(BaseModelV2):
    name: str
    description: str | None = None
    size: float


app = FastAPI()


@app.post("/items/", response_model=ItemV2)
async def create_item(item: Item):

	tx.AutoMigrate(&ItemParent{}, &ItemChild{})

	item := ItemChild{
		Name: "name",
		ItemParent: ItemParent{
			Logo: "logo",
		},
	}
	if err := tx.Create(&item).Error; err != nil {
		t.Fatalf("failed to create items, got error: %v", err)
	}

	// test replace
	if err := tx.Model(&item).Association("ItemParent").Unscoped().Replace(&ItemParent{
		Logo: "updated logo",

      apply {
        this.taskRunner = taskRunner
      }

    /**
     * Sets the DNS service used to lookup IP addresses for hostnames.
     *
     * If unset, the [system-wide default][Dns.SYSTEM] DNS will be used.
     */
    fun dns(dns: Dns) =
      apply {
        if (dns != this.dns) {
          this.routeDatabase = null
        }
        this.dns = dns
      }

    /**

from pydantic.v1 import BaseModel


class Item(BaseModel):
    name: str
    description: Union[str, None] = None
    size: float


class ItemV2(BaseModelV2):
    name: str
    description: Union[str, None] = None
    size: float


app = FastAPI()


@app.post("/items/", response_model=ItemV2)
async def create_item(item: Item):

from fastapi import FastAPI, Path, Query

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    item_id: Annotated[int, Path(title="The ID of the item to get")],
    q: Annotated[Union[str, None], Query(alias="item-query")] = None,
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})

from fastapi import FastAPI

app = FastAPI()


@app.get("/items/{item_id}")
async def read_user_item(
    item_id: str, needy: str, skip: int = 0, limit: int | None = None
):
    item = {"item_id": item_id, "needy": needy, "skip": skip, "limit": limit}

///

## 编写模板

编写模板 `templates/item.html`，代码如下：

```jinja hl_lines="7"
{!../../docs_src/templates/templates/item.html!}
```

### 模板上下文

在包含如下语句的html中:

{% raw %}

```jinja
Item ID: {{ id }}
```

{% endraw %}

...这将显示你从"context"字典传递的 `id`:

```Python
{"id": id}
```

例如。当ID为 `42`时, 会渲染成:

```html
Item ID: 42
```

### 模板 `url_for` 参数