return item

    @app.get("/items/")
    def read_items() -> list[Item]:
        return [
            Item(
                name="Portal Gun",
                description="Device to travel through the multi-rick-verse",
                sub=SubItem(subname="subname"),
            ),
            Item(name="Plumbus"),
        ]

    @app.post("/with-computed-field/")
    def create_with_computed_field(

    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick", salutation="Mr.")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

```Python
q: Annotated[str, Query(default="rick")] = "morty"
```

...because it's not clear if the default value should be `"rick"` or `"morty"`.

So, you would use (preferably):

```Python
q: Annotated[str, Query()] = "rick"
```

...or in older code bases you will find:

```Python
q: str = Query(default="rick")
```

    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick", salutation="Mr.")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick", salutation="Mr.")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

예를 들어, 다음은 허용되지 않습니다:

```Python
q: Annotated[str, Query(default="rick")] = "morty"
```

...왜냐하면 기본값이 `"rick"`인지 `"morty"`인지 명확하지 않기 때문입니다.

따라서 (가능하면) 다음과 같이 사용합니다:

```Python
q: Annotated[str, Query()] = "rick"
```

...또는 오래된 코드베이스에서는 다음과 같은 코드를 찾게 될 것입니다:

```Python
q: str = Query(default="rick")
```

### `Annotated`의 장점 { #advantages-of-annotated }

    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick", salutation="Mr.")
        function ->> execute: execute function code
        execute ->> code: return the result
    end

        code ->> function: say_hi(name="Rick")
        function ->> execute: 执行函数代码
        execute ->> code: 返回结果
    end

    rect rgba(0, 255, 0, .1)
        code ->> function: say_hi(name="Rick", salutation="Mr.")
        function ->> execute: 执行函数代码
        execute ->> code: 返回结果
    end

    rect rgba(0, 255, 255, .1)
        code ->> function: say_hi(name="Rick")
        function ->> code: 返回存储的结果

相反，应使用函数参数本身的实际默认值。否则会不一致。

例如，下面这样是不允许的：

```Python
q: Annotated[str, Query(default="rick")] = "morty"
```

...因为不清楚默认值应该是 `"rick"` 还是 `"morty"`。

因此，你应该这样用（推荐）：

```Python
q: Annotated[str, Query()] = "rick"
```

...或者在旧代码库中你会见到：

```Python
q: str = Query(default="rick")
```

### `Annotated` 的优势 { #advantages-of-annotated }

例えば、これは許可されません:

```Python
q: Annotated[str, Query(default="rick")] = "morty"
```

...なぜなら、デフォルト値が `"rick"` なのか `"morty"` なのかが不明確だからです。

そのため、（できれば）次のようにします:

```Python
q: Annotated[str, Query()] = "rick"
```

...または、古いコードベースでは次のようなものが見つかるでしょう:

```Python
q: str = Query(default="rick")
```

### `Annotated` の利点 { #advantages-of-annotated }