models.Base.metadata.create_all(bind=engine)

app = FastAPI()


@app.middleware("http")
async def db_session_middleware(request: Request, call_next):
    response = Response("Internal server error", status_code=500)
    try:
        request.state.db = SessionLocal()
        response = await call_next(request)
    finally:
        request.state.db.close()
    return response


# Dependency

models.Base.metadata.create_all(bind=engine)

app = FastAPI()


@app.middleware("http")
async def db_session_middleware(request: Request, call_next):
    response = Response("Internal server error", status_code=500)
    try:
        request.state.db = SessionLocal()
        response = await call_next(request)
    finally:
        request.state.db.close()
    return response


# Dependency

    def copy_field_info(*, field_info: FieldInfo, annotation: Any) -> FieldInfo:
        cls = type(field_info)
        merged_field_info = cls.from_annotation(annotation)
        new_field_info = copy(field_info)
        new_field_info.metadata = merged_field_info.metadata
        new_field_info.annotation = merged_field_info.annotation
        return new_field_info

                    so it's an error from the API developer. So, FastAPI will raise an
                    error and return a 500 error code (Internal Server Error).

                Read more about it in the
                [FastAPI docs for Response Model](https://fastapi.tiangolo.com/tutorial/response-model/).
                """
            ),