content: Optional[Dict[str, MediaType]] = None


class Parameter(ParameterBase):
    name: str
    in_: ParameterInType = Field(alias="in")


class Header(ParameterBase):
    pass


class RequestBody(BaseModelWithConfig):
    description: Optional[str] = None
    content: Dict[str, MediaType]
    required: Optional[bool] = None


class Link(BaseModelWithConfig):

### Tests

* Help me check that the PR has **tests**.

* Check that the tests **fail** before the PR. 🚨

* Then check that the tests **pass** after the PR. ✅

* Many PRs don't have tests, you can **remind** them to add tests, or you can even **suggest** some tests yourself. That's one of the things that consume most time and you can help a lot with that.

Then, in **FastAPI**, you could use a Python class as a dependency.

What FastAPI actually checks is that it is a "callable" (function, class or anything else) and the parameters defined.

If you pass a "callable" as a dependency in **FastAPI**, it will analyze the parameters for that "callable", and process them in the same way as the parameters for a *path operation function*. Including sub-dependencies.

```Python
# db._state = PeeweeConnectionState()
```

& 📁 `sql_app/main.py` 📁, 🏤 💪 `async` 🔗 `reset_db_state()` & ❎ ⚫️ ⏮️ `pass`:

```Python
async def reset_db_state():
#     database.db._state._state.set(db_state_default.copy())
#     database.db._state.reset()
    pass
```

⤴️ 🏃 👆 📱 ⏮️ Uvicorn:

<div class="termy">

```console
$ uvicorn sql_app.main:app --reload

## Context Managers

### What are "Context Managers"

```

1. Copy the `main.py` file to the `/code` directory directly (without any `./app` directory).

2. Use `fastapi run` to serve your application in the single file `main.py`.

When you pass the file to `fastapi run` it will detect automatically that it is a single file and not part of a package and will know how to import it and serve your FastAPI app. 😎

## Deployment Concepts