Override django's model delete method for bulk deletion

Question

I\'m overriding Django\'s model delete method in order to delete orphan files in the disk for image fields, something like this:

class Image(models.Model):
          


        

Answer 1

Delete method of queryset works directly on the database. It does not call Model.delete() methods. From the docs:

Keep in mind that this will, whenever possible, be executed purely in SQL, and so the delete() methods of individual object instances will not necessarily be called during the process. If you’ve provided a custom delete() method on a model class and want to ensure that it is called, you will need to “manually” delete instances of that model (e.g., by iterating over a QuerySet and calling delete() on each object individually) rather than using the bulk delete() method of a QuerySet.

If you want to override Django administration interface's default behavior, you can write a custom delete action:

https://docs.djangoproject.com/en/1.7/ref/contrib/admin/actions/

Another method is to override post_delete (or pre_delete) signal instead of delete method:

https://docs.djangoproject.com/en/1.7/ref/signals/#django.db.models.signals.post_delete

Like pre_delete, but sent at the end of a model’s delete() method and a queryset’s delete() method.