python - Using await with fastapi

Question

I’ve followed the fastapi documentation but still get a error message when using this code:

async def set_pizza_status_to_ready(order: Order, db: Session):
    await baking_pizzas(order, db, 60)
    pizzas = get_all_pizzas_in_order(order, db)
    for pizza in pizzas:
        pizza.status = 'READY'

def baking_pizzas(order: Order, db: Session, minutes: float):
    # simulate baking duration and set pizzas to ready afterwards
    time.sleep(minutes * 60)

RuntimeWarning: coroutine 'set_pizza_status_to_ready' was never awaited

question from:https://stackoverflow.com/questions/65602607/using-await-with-fastapi

Answer 1

Use await expression before the coroutine.

await set_pizza_status_to_ready()

It is not a function but a coroutine, it yields. You need to await it.

But there are some restrictions. You can not use the await keyword if you are not calling a coroutine inside a coroutine function.

There are also some workarounds for this

You can use asyncio.run(my_coroutine) to run a coroutine inside a function.