{* ../../docs_src/generate_clients/tutorial001_py39.py hl[7:9,12:13,16:17,21] *}

Beachten Sie, dass die *Pfadoperationen* die Modelle definieren, welche diese für die Request- und Response-<abbr title="Die eigentlichen Nutzdaten, abzüglich der Metadaten">Payload</abbr> verwenden, indem sie die Modelle `Item` und `ResponseMessage` verwenden.

### API-Dokumentation

<img src="/img/tutorial/body/image01.png">

이를 필요로 하는 각각의 *경로 작동*내부의 API 문서에도 사용됩니다:

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

## 편집기 지원

편집기에서, 함수 내에서 타입 힌트와 완성을 어디서나 (만약 Pydantic model 대신에 `dict`을 받을 경우 나타나지 않을 수 있습니다) 받을 수 있습니다:

<img src="/img/tutorial/body/image03.png">

잘못된 타입 연산에 대한 에러 확인도 받을 수 있습니다:

<img src="/img/tutorial/body/image04.png">

단순한 우연이 아닙니다. 프레임워크 전체가 이러한 디자인을 중심으로 설계되었습니다.

	if err := DB.Create(&user).Error; err != nil {
		t.Fatalf("errors happened when create: %v", err)
	}

	var result struct {
		Something string
		User
	}

	DB.Model(User{}).Preload("Account", clause.Eq{Column: "number", Value: user.Account.Number}).Select(
		"users.*, 'yo' as something").First(&result, "name = ?", user.Name)

	CheckUser(t, user, result.User)
}

///

/// tip | İpucu

Merak ediyorsanız söyleyeyim, "AlexNet", "ResNet" ve "LeNet" isimleri Makine Öğrenmesi <abbr title="Teknik olarak, Derin Öğrenme model mimarileri">modellerini</abbr> temsil eder.

///

### Bir *Yol Parametresi* Tanımlayalım

Sonrasında, yarattığımız enum sınıfını (`ModelName`) kullanarak tip belirteci aracılığıyla bir *yol parametresi* oluşturalım:

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### Sadece modern Python

Tamamiyle standartlar **Python 3.8**'nın type hintlerine dayanıyor (Pydantic'in sayesinde). Yeni bir syntax öğrenmene gerek yok. Sadece modern Python.

Você pode ver esses schemas porque eles foram declarados com os modelos no app.

Essas informações estão disponíveis no **OpenAPI schema** do app e são mostradas na documentação da API (pelo Swagger UI).

E essas mesmas informações dos modelos que estão incluídas no OpenAPI são o que pode ser usado para **gerar o código do cliente**.

### Gerar um Cliente TypeScript

Agora que temos o app com os modelos, podemos gerar o código do cliente para o frontend.

    /**
     * Set a given project property. Properties set through this method are only valid
     * for the current build session and do not modify the underlying project model.
     *
     * @param project the project to modify
     * @param key they property's key
     * @param value the value or {@code null} to unset the property
     */

Создайте переменную `ALGORITHM` с алгоритмом, используемым для подписи JWT-токена, и установите для нее значение `"HS256"`.

Создайте переменную для срока действия токена.

Определите Pydantic Model, которая будет использоваться для формирования ответа на запрос на получение токена.

Создайте служебную функцию для генерации нового токена доступа.

/// tip | Tipp

Pydantic verhält sich speziell, wenn Sie `Optional` oder `Union[Etwas, None]` ohne einen Default-Wert verwenden. Sie können darüber in der Pydantic Dokumentation unter <a href="https://docs.pydantic.dev/2.3/usage/models/#required-fields" class="external-link" target="_blank">Required fields</a> mehr erfahren.

///

## Typhinweise mit Metadaten-Annotationen

inside and make sure it is serializable as JSON, using the same [JSON Compatible Encoder](../tutorial/encoder.md){.internal-link target=_blank} explained in the tutorial. This is what allows you to return **arbitrary objects**, for example database models.

But if you are certain that the content that you are returning is **serializable with JSON**, you can pass it directly to the response class and avoid the extra overhead that FastAPI would have by passing your return content through the...