Say we have:
class Foo(models.Model):
title = models.CharField(max_length=128)
number = models.PositiveSmallIntegerField()
bar = models.ForeignKey('Bar')
class Meta:
ordering = ['title',]
class Bar(models.Model):
title = models.CharField(max_length=128)
class Meta:
ordering = ['title',]
when I do A.objects.all() I want to sort by title. But when
B.foo_set.all() I would like to always order by A.number.
It seems like a custom manager is the path here, but there does not
appear to be a way to define one when defining the relationship.
I know I could have a method on Bar like:
def my_foos(self):
return self.foo_set.all().order_by('number')
But that means the user of the model has to always remember to use the
method instead of the related name which to me at least does not seem
much better than always remembering to use order_by().
Ideas?
Is there a reason why custom managers can not be specified for
relations? It seems like simply passing related_manager=MyCustomManager
would work and make sense within the existing framework. Quickly looking
at Trac I see #3871 with an old patch and no real traction. I'd be
willing to work with the Django team if this is something that would be
accepted.
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