Custom QuerySet and Manager without breaking DRY?

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The Django 1.7 released a new and simple way to create combined queryset and model manager:

class InquiryQuerySet(models.QuerySet):
    def for_user(self, user):
        return self.filter(
            Q(assigned_to_user=user) |
            Q(assigned_to_group__in=user.groups.all())
        )

class Inquiry(models.Model):
    objects = InqueryQuerySet.as_manager()

See Creating Manager with QuerySet methods for more details.

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