Question

Hey I want to sort objects based on a computed value in django… how do I do it?

Here is an example User profile model based on stack overflow that explains my predicament:

class Profile(models.Model):
    user = models.ForeignKey(User)

    def get_reputation():
        ... 
        return reputation
    reputation = property(get_reputation)

So, say I want to sort users by reputation. How do I do that? I know you can’t just do this:

Profile.objects.order_by("-reputation")

Thanks for your help everyone 🙂

Answer 1

If you need to do the sorting in the database (because you have lots of records, and need to e.g. paginate them), the only real option is to turn reputation into a denormalized field (e.g. updated in an overridden save() method on the model).