run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add -A
          if git diff --staged --quiet; then
            echo "No changes to commit"
          else
            git commit -m "🎨 Auto format"
            git push
          fi
      - uses: pre-commit-ci/lite-action@v1.1.0

Keep in mind that dataclasses can't do everything Pydantic models can do.

So, you might still need to use Pydantic models.

But if you have a bunch of dataclasses laying around, this is a nice trick to use them to power a web API using FastAPI. 🤓

///

## Dataclasses in `response_model` { #dataclasses-in-response-model }

You can also use `dataclasses` in the `response_model` parameter:

                        },
                        "user": {
                            "$ref": "#/components/schemas/User",
                        },
                    },
                    "required": [
                        "item",
                        "user",
                    ],
                    "title": "Body_update_item_items__item_id__put",

from docs_src.python_types.tutorial012_py39 import User


def test_user():
    user = User(name="John Doe", age=30)
    assert user.name == "John Doe"

from docs_src.path_params.tutorial003_py39 import app

client = TestClient(app)


@pytest.mark.parametrize(
    ("user_id", "expected_response"),
    [
        ("me", {"user_id": "the current user"}),
        ("alice", {"user_id": "alice"}),
    ],
)
def test_get_users(user_id: str, expected_response: dict):
    response = client.get(f"/users/{user_id}")
    assert response.status_code == 200, response.text

    user_data = {
        "username": "foo",
        "password": "fighter",
        "email": "******@****.***",
        "full_name": "Grave Dohl",
    }
    response = client.post(
        "/user/",
        json=user_data,
    )
    assert response.status_code == 200, response.text
    assert response.json() == user_data


def test_openapi_schema(client: TestClient):

                    "description": 'Create an invoice.\n\nThis will (let\'s imagine) let the API user (some external developer) create an\ninvoice.\n\nAnd this path operation will:\n\n* Send the invoice to the client.\n* Collect the money from the client.\n* Send a notification back to the API user (the external developer), as a callback.\n    * At this point is that the API will somehow send a POST request to the\n        external API with the...

**Spoiler alert**: the tutorial - user guide includes:

* Declaration of **parameters** from other different places as: **headers**, **cookies**, **form fields** and **files**.
* How to set **validation constraints** as `maximum_length` or `regex`.

    ```python
    from typing import Annotated

    from fastapi import Security, FastAPI

    from .db import User
    from .security import get_current_active_user

    app = FastAPI()

    @app.get("/users/me/items/")
    async def read_own_items(
        current_user: Annotated[User, Security(get_current_active_user, scopes=["items"])]
    ):

                                    }
                                }
                            },
                        },
                    },
                    "summary": "Read User Item",
                    "operationId": "read_user_item_items__item_id__get",
                    "parameters": [
                        {
                            "required": True,