"servers": [
        {
            "url": "/api/v1"
        },
        {
            "url": "https://stag.example.com",
            "description": "Staging environment"
        },
        {
            "url": "https://prod.example.com",
            "description": "Production environment"
        }
    ],
    "paths": {
            // Plus d'éléments ici
    }
}
```

/// tip | Astuce

    "servers": [
        {
            "url": "/api/v1"
        },
        {
            "url": "https://stag.example.com",
            "description": "Staging environment"
        },
        {
            "url": "https://prod.example.com",
            "description": "Production environment"
        }
    ],
    "paths": {
            // Mais coisas aqui
    }
}
```

/// tip | Dica

	if err != nil {
		apiErr := errorCodes.ToAPIErr(ErrMalformedXML)
		apiErr.Description = err.Error()
		writeErrorResponse(ctx, w, apiErr, r.URL)
		return
	}
	// validate the request
	if err := rreq.validate(ctx, objectAPI); err != nil {
		apiErr := errorCodes.ToAPIErr(ErrMalformedXML)
		apiErr.Description = err.Error()
		writeErrorResponse(ctx, w, apiErr, r.URL)
		return
	}

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


class ItemV2(BaseModelV2):
    title: str
    summary: str | None = None


app = FastAPI()


@app.post("/items/", response_model=ItemV2)
def create_item(item: Item):
    return {"title": item.name, "summary": item.description}
```

Cela signifie que si vous souhaitez mettre à jour l’élément `bar` avec `PUT` et un corps contenant :

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```

comme il n’inclut pas l’attribut déjà enregistré « tax »: 20.2, le modèle d’entrée prendrait la valeur par défaut « tax »: 10.5.

### Aviso sobre a substituição { #warning-about-replacing }

Isso significa que, se você quiser atualizar o item `bar` usando `PUT` com um corpo contendo:

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```

como ele não inclui o atributo já armazenado `"tax": 20.2`, o modelo de entrada assumiria o valor padrão de `"tax": 10.5`.

E os dados seriam salvos com esse "novo" `tax` de `10.5`.

* `File()`

Las claves del `dict` identifican cada ejemplo, y cada valor es otro `dict`.

Cada `dict` específico del ejemplo en los `examples` puede contener:

* `summary`: Descripción corta del ejemplo.
* `description`: Una descripción larga que puede contener texto Markdown.
* `value`: Este es el ejemplo real mostrado, e.g. un `dict`.

    "servers": [
        {
            "url": "/api/v1"
        },
        {
            "url": "https://stag.example.com",
            "description": "Staging environment"
        },
        {
            "url": "https://prod.example.com",
            "description": "Production environment"
        }
    ],
    "paths": {
            // Здесь ещё что-то
    }
}
```

/// tip | Совет

    "servers": [
        {
            "url": "/api/v1"
        },
        {
            "url": "https://stag.example.com",
            "description": "Staging environment"
        },
        {
            "url": "https://prod.example.com",
            "description": "Production environment"
        }
    ],
    "paths": {
            // Ще дещо тут
    }
}
```

/// tip | Порада

請留意，不同工具對 OpenAPI 的支援程度可能不同。

有些工具可能暫時還不會顯示所有額外資訊；不過多半這些缺漏功能已在開發規劃中。

///

你可以加入 `title`：

{* ../../docs_src/query_params_str_validations/tutorial007_an_py310.py hl[10] *}

以及 `description`：

{* ../../docs_src/query_params_str_validations/tutorial008_an_py310.py hl[14] *}

## 別名參數 { #alias-parameters }

想像你希望參數名稱是 `item-query`。

像這樣：

```