Your instance is probably not yet saved to the database, so the m2m-related objects don't know which instance to connect to. There's problem something wrong in your save() method. I often use "assert False, some_var" to check if at some point the variable is already set or not.
And I get the same problem as you so many times that forms have become the thing I hate the most about Django, even though my lack of knowledge is the one to be blamed, not the framework. Cheers, AT On Thu, Aug 18, 2011 at 5:48 AM, Tom Evans <tevans...@googlemail.com> wrote: > On Thu, Aug 18, 2011 at 4:44 AM, Shawn Milochik <sh...@milochik.com> > wrote: > > I have some code that modifies related items when a model is saved. I've > > tried this by both using a post_save signal and by putting the code > directly > > in a save() override. > > > > When I save an instance in the Django admin, it never works. > > When I save an instance in ./manage.py shell it always works. > > > > Why would this be? > > > > For instance, if my code (in the save override) is this: > > > > self.some_m2m_field.clear() > > self.some_m2m_field.add(this_thing) > > > > Then if I go into the admin and save the instance, this_thing is not > > attached to the instance. But if I do a .save() in the shell and check it > > has been assigned. > > > > I assume I'm missing something fundamental about this. > > > > Thanks, > > Shawn > > I've never encountered this Shawn, but the primary difference between > those two is that saving in the admin will go through a ModelForm. > Does the admin site use frm.save(commit=False) and then run > frm.save_m2m()? frm.save_m2m() would definitely be run after both an > overwritten save() and a post_save hook. > > Worth a thought. > > 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. > > -- 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.
