Snippet

Decoupled Logic with Signals

Signals allow you to execute code when a specific action happens elsewhere in your application, such as saving a user.

snippet.py

python

from django.db.models.signals import post_save
from django.dispatch import receiver
from django.contrib.auth.models import User
 
@receiver(post_save, sender=User)
def user_created_handler(sender, instance, created, **kwargs):
    if created:
        print(f'New user: {instance.username}')

django

Breakdown

@receiver(post_save, sender=User)

Connects this function to the 'post_save' signal of the User model.

if created:

A boolean that is True if a new record was created, False if updated.

instance

The actual object instance that was just saved.

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Decoupled Logic with Signals

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