What are some examples of custom signals in Django?

What are some examples of custom signals in Django?

In Django, custom signals allow you to create your own events that can be triggered and listened to. For example, you might create a signal that triggers when a user profile is updated.

Can you show me how to create a custom signal?

Sure! You can create a custom signal using Django's Signal class. Here's a simple example:

from django.dispatch import Signal

# Define a custom signal
profile_updated = Signal(providing_args=['instance'])

# Connect a receiver function to the signal
@receiver(profile_updated)
def profile_updated_handler(instance):
    print(f'Profile updated for {instance}')

How do I connect the signal to a model?

You can connect the signal to a model by using the post_save signal. For example:

from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=UserProfile)
def user_profile_saved(sender, instance, created, **kwargs):
    if created:
        profile_updated.send(sender=UserProfile, instance=instance)

What are some use cases for custom signals?

Custom signals can be used for various purposes, such as notifying other parts of your application when a user registers, when an order is completed, or when a profile is updated.