Django

Django Signals - post_delete()

Django tip:

To notify another part of the application after the delete event of an object happens, you can use the post_delete signal.

For example:

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


@receiver(post_delete, sender=Order)
def add_to_inventory(sender, instance, **kwargs):
    inventory_item = Inventory.objects.get(id=instance.inventory_item.id)
    inventory_item.quantity = inventory_item.quantity + instance.quantity

    inventory_item.save()