Add in an if statement, one that while cycling through the only_me=True list, ignores the current model you're saving.
def save(self):
if self.only_me:
only_me_true = MyModel.objects.filter(only_me=True)
for obj in only_me_true:
if obj.id != self.id:
obj.only_me = False
obj.save()
MyModel.save(self)
On Friday 15 January 2010 17:01:42 Victor Loureiro Lima wrote:
> I think that will not work,when I call the obj.save() I will inevitably
> step again into my own save() method and the only_me wont be set as False
> yet, thus the same problem would occur again and again until I get the
> maximum depth error. I dont think thats an option, ahev you tested this
> solution? I am far from my box right now, so I cant test it.
>
> Victor Lima
>
> 2010/1/15 Gabriel Reis <gabriel...@gmail.com>
>
> > Hey Victor,
> >
> > I can think that a trivial way (I am not sure if it is the best) to do
> > that is to overwrite the save() method of your model:
> >
> > class MyModel(models.Model):
> > title = models.CharField(max_length=100)
> > only_me = models.Boolean(default=False)
> >
> > def save(self):
> > if self.only_me:
> > only_me_true = MyModel.objects.filter(only_me=True)
> > for obj in only_me_true:
> > obj.only_me = False
> > obj.save()
> > MyModel.save(self)
> >
> >
> > I would go for that solution. It is easy to implement, it seems clean and
> > it is easy to test as well.
> >
> > Cheers dude!
> >
> > Gabriel de Carvalho Nogueira Reis
> > Software Developer
> > +44 7907 823942
> >
> >
> > On Sat, Jan 16, 2010 at 12:22 AM, Victor Loureiro Lima <
> >
> > victorloureirol...@gmail.com> 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?
> >>
> >> Thanks in Advance,
> >> Victor Lima
> >>
> >> --
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> >
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