On Fri, Mar 16, 2012 at 6:33 PM, Rainy <andrei....@gmail.com> wrote: > Hi, I have a function that accepts a pk and deletes an object: > > Item.objects.filter(pk=pk).delete() > > If I change it to: > > Item.objects.get(pk=pk).delete() > > it no longer works, without any errors. I tried it using exactly the > same object. I looked at django docs for deletion, the only difference > they mention is that with .filter(), it will also do bulk deletion. > > What is the reason for this behaviour? Thanks! >
Those are two very different methods, instance.delete() on a model calls the instance's delete method, which (eventually) via the Model.delete() method, sends a pre_delete signal, issues a SQL statement to delete that row from the database and finally issues a post_delete signal. queryset.delete() does not do any of that, it simply constructs a "DELETE FROM ... WHERE ..." query and executes it. So why does your instance.delete() not work? Top contenders: 1) You have overridden the delete() method, and you don't call the super class method 2) You have a pre_delete signal that refuses the deletion (altho I think you would receive an exception in this case?) 3) Something I haven't considered \o/ Cheers Tom -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
