## Valeurs prédéfinies

Si vous avez une *fonction de chemin* qui reçoit un *paramètre de chemin*, mais que vous voulez que les valeurs possibles des paramètres soient prédéfinies, vous pouvez utiliser les <abbr title="Enumeration">`Enum`</abbr> de Python.

### Création d'un `Enum`

It could look like this:

```JSON  hl_lines="7"
{
  "name": "frontend-app",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "generate-client": "openapi-ts --input http://localhost:8000/openapi.json --output ./src/client --client axios"
  },
  "author": "",
  "license": "",
  "devDependencies": {

# Advanced Middleware

In the main tutorial you read how to add [Custom Middleware](../tutorial/middleware.md){.internal-link target=_blank} to your application.

And then you also read how to handle [CORS with the `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank}.

In this section we'll see how to use other middlewares.

## Adding ASGI middlewares

Você pode ler mais sobre nas documentaçãoes do repositório.

## Full Stack FastAPI MongoDB

...pode demorar, dependendo do meu tempo disponível e outros fatores. 😅 🎉

## Modelos de Aprendizado de Máquina com spaCy e FastAPI

Bu səhifənin məlumatları hər ay hesablanır və siz <a href="https://github.com/tiangolo/fastapi/blob/master/.github/actions/people/app/main.py" class="external-link" target="_blank">buradan mənbə kodunu</a> oxuya bilərsiniz.

Burada sponsorların əməyini də vurğulamaq istəyirəm.

Veriler ayda bir hesaplanır, <a href="https://github.com/tiangolo/fastapi/blob/master/.github/actions/people/app/main.py" class="external-link" target="_blank">kaynak kodu buradan</a> okuyabilirsin.

Burada sponsorların katkılarını da vurguluyorum.

from dirty_equals import IsDict
from fastapi.testclient import TestClient

from .main import app

client = TestClient(app)


def test_query():
    response = client.get("/query")
    assert response.status_code == 422
    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["query", "query"],

* Data validation
* API annotation and automatic documentation

And you only have to declare them once.

Bạn viết chuẩn Python với kiểu dữ liệu như sau:

```Python
from datetime import date

from pydantic import BaseModel

# Declare a variable as a str
# and get editor support inside the function
def main(user_id: str):
    return user_id


# A Pydantic model
class User(BaseModel):
    id: int
    name: str
    joined: date
```

Sau đó có thể được sử dụng:

```Python

        comment_id=comment_id,
        body=body,
    )
    response = UpdateCommentResponse.parse_obj(data)
    return response.data.updateDiscussionComment.comment


if __name__ == "__main__":
    settings = Settings()
    if settings.input_debug:
        logging.basicConfig(level=logging.DEBUG)
    else:
        logging.basicConfig(level=logging.INFO)