return x * 42


ml_models = {}


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Load the ML model
    ml_models["answer_to_everything"] = fake_answer_to_everything_ml_model
    yield
    # Clean up the ML models and release the resources
    ml_models.clear()


app = FastAPI(lifespan=lifespan)


@app.get("/predict")
async def predict(x: float):

    disabled = user_dict["disabled"],
    hashed_password = user_dict["hashed_password"],
)
```

/// info | Bilgi

`**user_dict` için daha kapsamlı bir açıklama için [**Extra Models** dokümantasyonundaki ilgili bölüme](../extra-models.md#about-user-in-dict) geri dönüp bakın.

///

## Token’ı Döndürme { #return-the-token }

`token` endpoint’inin response’u bir JSON object olmalıdır.

import pytest
from fastapi.openapi.models import Schema, SchemaType


@pytest.mark.parametrize(
    "type_value",
    [
        "array",
        ["string", "null"],
        None,
    ],
)
def test_allowed_schema_type(
    type_value: SchemaType | list[SchemaType] | None,
) -> None:
    """Test that Schema accepts SchemaType, List[SchemaType] and None for type field."""
    schema = Schema(type=type_value)

* the form model: das Formularmodell
* the form body: der Formularbody
* the header: der Header
* the headers (plural): die Header
* in headers (plural): in Headern
* the forwarded header: der Forwarded-Header
* the lifespan event: das Lifespan-Event
* the lock: der Lock
* the locking: das Locking
* the mobile application: die Mobile-Anwendung
* the model object: das Modellobjekt

~~ under the License.

 -----
 Super POM
 -----
 Hervé Boutemy
 -----
 2011-09-12
 -----

Super POM

 All models implicitly inherit from a super-POM:

    }

    /**
     * Gets the model name.
     *
     * @return the model name
     */
    public String getModel() {
        return model;
    }

    /**
     * Sets the model name.
     *
     * @param model the model name
     * @return this request for method chaining
     */
    public LlmChatRequest setModel(final String model) {
        this.model = model;
        return this;

还记得请求体也是使用 Pydantic 模型声明的吧。

放心，因为使用了 `Depends`，**FastAPI** 不会搞混。

///

/// check | 检查

依赖系统的这种设计方式可以支持不同的依赖项返回同一个 `User` 模型。

而不是局限于只能有一个返回该类型数据的依赖项。

///

## 其它模型 { #other-models }

接下来，直接在*路径操作函数*中获取当前用户，并用 `Depends` 在**依赖注入**系统中处理安全机制。

开发者可以使用任何模型或数据满足安全需求（本例中是 Pydantic 的 `User` 模型）。

而且，不局限于只能使用特定的数据模型、类或类型。

不想在模型中使用 `username`，而是使用 `id` 和 `email`？当然可以。这些工具也支持。

Посмотрим, как это работает, и как это изменить при необходимости.

## Pydantic‑модели для входа и выхода { #pydantic-models-for-input-and-output }

Предположим, у вас есть Pydantic‑модель со значениями по умолчанию, как здесь:

{* ../../docs_src/separate_openapi_schemas/tutorial001_py310.py ln[1:7] hl[7] *}

### Модель для входа { #model-for-input }

Если использовать эту модель как входную, как здесь:

    page.get_by_role("button", name="GET /items/ Read Items").click()
    page.get_by_role("button", name="Try it out").click()
    # Manually add the screenshot
    page.screenshot(path="docs/en/docs/img/tutorial/header-param-models/image01.png")

    # ---------------------
    context.close()
    browser.close()


process = subprocess.Popen(
    ["fastapi", "run", "docs_src/header_param_models/tutorial001.py"]
)
try:

    page.get_by_role("button", name="POST /login/ Login").click()
    page.get_by_role("button", name="Try it out").click()
    # Manually add the screenshot
    page.screenshot(path="docs/en/docs/img/tutorial/request-form-models/image01.png")

    # ---------------------
    context.close()
    browser.close()


process = subprocess.Popen(
    ["fastapi", "run", "docs_src/request_form_models/tutorial001.py"]
)
try: