Django cascade delete on reverse foreign keys

Question

Django shows how to set or override cascade deletes with foreign keys in their documents.

model = models.ForeignKey(MyModel, null = True, on_delete = models.SET         


        

Answer 1

I don't think the feature you are looking at is an ORM or database concept. You just want to execute a callback when something is deleted.

So use the post_delete signal and add you callback handler there

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

@receiver(post_delete, sender=MyModel)
def my_post_delete_callback(sender, **kwargs):
    #Sender is the model which when deleted should trigger this action
    #Do stuff like delete other things you want to delete
    #The object just deleted can be accessed as kwargs[instance]