Re: Override QuerySet.none()

On 27 juil, 06:27, gs794 <gregs...@gmail.com> wrote:
> Hi all,
>
> I'm having trouble overriding QuerySet.none() (code below)...  Works
> if I rename the method to almost anything but "none".
>
> class QuerySetManager(models.Manager):
>   def get_query_set(self):
>     return self.model.QuerySet(self.model)
>   def __getattr__(self, name):
>     return getattr(self.get_query_set(), name)
>
> class NewNoneQuerySet(models.query.QuerySet):
>   def none(self):
>     print 'NewNone\n\n\n\n'
>     return self.filter(pk__in=[])
>
> class TestNone(models.Model):
>   name = models.CharField(max_length=20)
>   objects = QuerySetManager()
>   class QuerySet(NewNoneQuerySet):
>     pass
>
> TestNone.objects.none()
>
> No output of 'NewNone\n\n\n\n'... Using the inherited method in other
> tests...  Is there something special about the none method?

Django is open-source, so you can read the source and find out by
yourself why your code doesn't work as expected (I just did, and took
me about 2 minutes).

FWIW, you want to have a look at how Manager.none is implemented (in /
django/db/manager.py)

HTH.

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