Hi!
I have a model like this:
class Thing(models.Model):
x = models.PositiveIntegerField()
y = models.PositiveIntegerField()
def z(self):
return self.x / self.y * A_CONSTANT
In a view I would like to retrieve a collection of Things ordered by z
(the computed field). I expected the order_by method to do the trick
like this:
things_collection = Thing.objects.order_by('z')
...but order_by will only work for fields actually stored in the
database (the above gives a "Cannot resolve keyword 'z' into field").
What would be the best way to implement a custom order_by that allows
ordering of computed model fields? Or have I missed some feature for
this in Django?
Regards,
Peter
--~--~---------~--~----~------------~-------~--~----~
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 [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en
-~----------~----~----~----~------~----~------~--~---
