Why signals enable decoupled communication in Django - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Django signal dispatcher.

Django

from django.dispatch import [1]

Drag options to blanks, or click blank then click option'

Areceiver

BSignal

Cconnect

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'receiver' instead of 'Signal'.

Trying to import 'connect' which is a method, not a class.

The Signal class is imported from django.dispatch to create custom signals.

2fill in blank

medium

Complete the code to define a new custom signal.

Django

my_signal = [1]()

Drag options to blanks, or click blank then click option'

ASignal

Bconnect

Creceiver

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'receiver' which is a decorator, not a signal.

Using 'send' which is a method to send signals.

To define a new signal, you create an instance of the Signal class.

3fill in blank

hard

Fix the error in connecting a receiver function to a signal.

Django

@receiver([1])
def my_handler(sender, **kwargs):
    print('Signal received')

Drag options to blanks, or click blank then click option'

Aconnect

Bsend

Cmy_signal

Dreceiver

Attempts:

3 left

💡 Hint

Common Mistakes

Passing 'send' or 'connect' which are methods, not signals.

Passing 'receiver' which is a decorator, not a signal.

The @receiver decorator needs the signal instance to connect the handler properly.

4fill in blank

hard

Fill both blanks to send a signal with a sender and extra data.

Django

my_signal.[1](sender=[2], data='hello')

Drag options to blanks, or click blank then click option'

Asend

Bsend_robust

Cmyapp.models.MyModel

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'send_robust' when 'send' is enough here.

Using 'None' as sender when a class is expected.

Use the send method on the signal instance, specifying the sender class.

5fill in blank

hard

Fill all three blanks to create a decoupled receiver function for a signal.

Django

from django.dispatch import [1]

@[2](my_signal)
def handle_signal(sender, **[3]):
    print('Handled decoupled signal')

Drag options to blanks, or click blank then click option'

Areceiver

BSignal

Ckwargs

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'Signal' instead of 'receiver'.

Using 'connect' as a decorator which is incorrect.

Not accepting '**kwargs' in the handler function.

Import the receiver decorator, use it to decorate the handler, and accept kwargs for extra data.