Thanks Eric, that worked like a charm. I've never got to use the update, thus I had no idea of its existence, fair enough that is exactelly what I needed.
Thank you very much, and other who have answered this thread. Victor Lima 2010/1/16 Eric Chamberlain <e...@rf.com> > > On Jan 15, 2010, at 4:22 PM, Victor Loureiro Lima wrote: > > > Here is the deal: > > > > class MyModel ( models.Model ): > > title = models.CharField( max_length = 100 ) > > only_me = models.BooleanField( default = False ) > > > > Question: Whats the proper way to guarantee that no matter how many > MyModel's are available in the database, only one of them > > will have the only_me set as True? To further clarify things: In the > admin, whenever I check the only_me checkbox, and save my model, all other > models of this class will have to have its own only_me field set to false. > > > > As far as I know, there is no other way of doing this unless I iterate > over all MyModel' s objects and uncheck them if they are checked, save them, > then afterwards check the model that I am actually saving setting the > only_me field to True. > > > > I tried doing this on the actual save() of the model, no success. > Everytime I called save on iterated objects, I, of course, got the maximum > recursive depth error thrown at me. > > Fair enough, I quickly thought about signals, hooking my function to > post_save(), however I inevitabilly stumbled upon the same > > problem: When I called save() on the iterated objects the post_save > signal got sent, I would step again in the same function, thus > > no cookie for me. > > I jumped over to overriding AdminForm' s save() method, so that I would > iterate there on the models unchecking them if necessary, and them returning > the proper object, but I stopped that and I said to myself that I must be > doing something really stupid, so Im coming to you guys: What would the > propper way of doing this? > > > > def save(self, force_insert=False, force_update=False): > if self.only_me is True: > # if this is the new default, set others to False > MyModel.objects.exclude(pk=self.pk).update(only_me=False) > > super(MyModel, self).save(force_insert, force_update) # Call the > "real" save() method. > > > -- > Eric Chamberlain, Founder > RF.com - http://RF.com/ > > > > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To post to this group, send email to django-us...@googlegroups.com. > To unsubscribe from this group, send email to > django-users+unsubscr...@googlegroups.com<django-users%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > > > >--
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