Wenn wir `-> HeroPublic` deklariert hätten, würden Ihr Editor und Linter (zu Recht) reklamieren, dass Sie ein `Hero` anstelle eines `HeroPublic` zurückgeben.

Durch die Deklaration in `response_model` sagen wir **FastAPI**, dass es seine Aufgabe erledigen soll, ohne die Typannotationen und die Hilfe von Ihrem Editor und anderen Tools zu beeinträchtigen.

///

```Python
commons = Depends(CommonQueryParams)
```

////

...como em:

{* ../../docs_src/dependencies/tutorial003_an_py310.py hl[19] *}

Mas declarar o tipo é encorajado por que é a forma que o seu editor de texto sabe o que será passado como valor do parâmetro `commons`, e assim ele pode ajudar com preenchimento automático, verificações de tipo, etc:

<img src="/img/tutorial/dependencies/image02.png">

public class EditForm extends CreateForm {

    /**
     * Creates a new EditForm instance.
     */
    public EditForm() {
        super();
    }

    /**
     * The unique identifier of the role being edited.
     * This is a required field for identifying which role to update.
     */
    @Required
    @Size(max = 1000)
    public String id;

    /**
     * The username of the user who last updated this role.

public class EditForm extends CreateForm {

    /**
     * Creates a new EditForm instance.
     */
    public EditForm() {
        super();
    }

    /**
     * The unique identifier of the label type being edited.
     * This is a required field for identifying which label type to update.
     */
    @Required
    @Size(max = 1000)
    public String id;

    /**

///

## Ek bilgi ekleyin { #add-extra-information }

`Field`, `Query`, `Body` vb. içinde ek bilgi tanımlayabilirsiniz. Bu bilgiler oluşturulan JSON Schema'ya dahil edilir.

Örnek (examples) tanımlamayı öğrenirken, dokümanların ilerleyen kısımlarında ek bilgi ekleme konusunu daha ayrıntılı göreceksiniz.

/// warning | Uyarı

     * Indicates whether this is a create, read, update, or delete operation.
     */
    @ValidateTypeFailure
    public int crudMode;

    /**
     * The unique identifier of the job log entry being edited.
     * This is a required field for identifying which job log to update.
     */
    @Required
    @ValidateTypeFailure
    public String id;

    /**
     * The name of the job that was executed.

{* ../../docs_src/strict_content_type/tutorial001_py310.py hl[4] *}

Bu ayarla, Content-Type header’ı olmayan request’lerin body’si JSON olarak parse edilir. Bu, FastAPI’nin eski sürümlerindeki davranışla aynıdır.

/// info | Bilgi

Bu davranış ve yapılandırma FastAPI 0.132.0’da eklendi.

你也可以把文件路径传给 `fastapi dev` 命令，它会猜测要使用的 FastAPI 应用对象：

```console
$ fastapi dev main.py
```

但每次运行 `fastapi` 命令都需要记得传入正确的路径。

另外，其他工具可能找不到它，例如 [VS Code 扩展](editor-support.md) 或 [FastAPI Cloud](https://fastapicloud.com)，因此推荐在 `pyproject.toml` 中使用 `entrypoint`。

## `fastapi dev` { #fastapi-dev }

当你运行 `fastapi dev` 时，它将以开发模式运行。

Sie müssen den Rückgabetyp für das Streamen von Binärdaten nicht wirklich annotieren.

Da FastAPI die Daten nicht mit Pydantic in JSON umzuwandeln oder sie anderweitig zu serialisieren versucht, ist die Typannotation hier nur für Ihren Editor und Tools relevant, sie wird von FastAPI nicht verwendet.

{* ../../docs_src/stream_data/tutorial001_py310.py ln[32:35] hl[33] *}

你也可以把檔案路徑傳給 `fastapi dev` 指令，它會推測要使用的 FastAPI app 物件：

```console
$ fastapi dev main.py
```

但這樣每次呼叫 `fastapi` 指令時都得記得傳入正確的路徑。

此外，其他工具可能找不到它，例如 [VS Code 擴充套件](editor-support.md) 或 [FastAPI Cloud](https://fastapicloud.com)，因此建議在 `pyproject.toml` 中使用 `entrypoint`。

## `fastapi dev` { #fastapi-dev }

執行 `fastapi dev` 會啟動開發模式。