Custom signals in Django - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Django signal dispatcher.

Django

from django.dispatch import [1]

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ASignal

Breceiver

Csend

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'receiver' instead of 'Signal'.

Trying to import 'send' 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 named order_completed.

Django

order_completed = [1]()

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ASignal

Breceiver

Csend

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

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

Trying to call 'send' which is a method to send signals.

To create a custom signal, instantiate the Signal class.

3fill in blank

hard

Fix the error in the receiver function decorator to connect it to the order_completed signal.

Django

@[1](order_completed)
def notify_user(sender, **kwargs):
    print('Order completed!')

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

ASignal

Breceiver

Csend

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@Signal' which is a class, not a decorator.

Using '@send' which is a method, not a decorator.

The @receiver decorator connects the function to the signal.

4fill in blank

hard

Fill both blanks to send the order_completed signal with the sender as the Order class.

Django

order_completed.[1](sender=[2])

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Asend

BOrder

Cconnect

Dreceiver

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'connect' instead of 'send' to trigger the signal.

Passing an instance instead of the class as sender.

Use the send method on the signal to notify receivers, specifying the sender.

5fill in blank

hard

Fill all three blanks to define a receiver function that listens to order_completed and prints the order ID from kwargs.

Django

@[1](order_completed)
def handle_order(sender, **[2]):
    print(f"Order ID: [3]['order_id']")

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

Areceiver

Bkwargs

Dargs

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'args' instead of 'kwargs' to get keyword arguments.

Forgetting the '@receiver' decorator.

The receiver decorator connects the function to the signal. The function uses **kwargs to access extra data, here printing the 'order_id'.