Async views basics in Django - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this async Django view?

Consider this async Django view. What will the client receive as a response body?

Django

from django.http import JsonResponse
import asyncio

async def my_view(request):
    await asyncio.sleep(0.1)
    return JsonResponse({'message': 'Hello async'})

A TypeError: object JsonResponse can't be awaited

B {"message": "Hello async"}

C HttpResponse with empty body

D RuntimeError: This event loop is already running

💡 Hint

Async views can use await inside and return normal HttpResponse or JsonResponse objects.

Async views in Django can use await for async operations like asyncio.sleep. Returning JsonResponse sends JSON data as HTTP response body.

📝 Syntax

intermediate

Which option correctly defines an async Django view?

Select the option that correctly defines an async Django view function.

A def view(request): await HttpResponse('Hi')

B def async view(request): return HttpResponse('Hi')

C async def view(request): return HttpResponse('Hi')

D async def view(request): await HttpResponse('Hi')

💡 Hint

Async views must be defined with async def and can return HttpResponse directly.

Option C correctly uses async def and returns HttpResponse. Option C has invalid syntax. Option C tries to await a non-awaitable. Option C uses await outside async function.

🔧 Debug

advanced

What error occurs when awaiting a synchronous Django ORM call in async view?

Given this async view snippet, what error will it raise? async def view(request): user = await User.objects.get(id=1) return HttpResponse(user.username)

A TypeError: 'User' object is not awaitable

B RuntimeError: Cannot run sync code in async context

C OperationalError: database connection lost

D No error, returns username

💡 Hint

Django ORM calls are synchronous and cannot be awaited directly.

Django ORM methods like get() are synchronous and return model instances, which are not awaitable. Awaiting them causes TypeError.

❓ state_output

advanced

What is the order of printed output in this async Django view?

Analyze the following async view and determine the order of printed lines in the server console.

Django

import asyncio
from django.http import HttpResponse

async def view(request):
    print('Start')
    await asyncio.sleep(0.05)
    print('Middle')
    await asyncio.sleep(0.05)
    print('End')
    return HttpResponse('Done')

A Start, Middle, End

B Start, End, Middle

C End, Middle, Start

D Middle, Start, End

💡 Hint

Await pauses execution until the awaited task completes.

The prints happen sequentially with awaits in between, so output order is Start, Middle, End.

🧠 Conceptual

expert

Which statement about Django async views is TRUE?

Select the true statement about async views in Django.

A Async views can directly call synchronous ORM methods without issues.

B Async views must always return JsonResponse objects.

C Async views run in a separate thread by default.

D Async views allow awaiting asynchronous code but must avoid blocking sync calls.

💡 Hint

Think about how async views handle async and sync code.

Async views can await async code but synchronous blocking calls like ORM must be handled carefully (e.g., using sync_to_async). They do not run in separate threads by default and can return any HttpResponse subclass.