Returns a dict to use as a filter for ordering operations
        containing the original ``Meta.order_with_respect_to`` value
        if provided. If the field is a Generic Relation, the dict
        returned contains names and values for looking up the
        relation's ``ct_field`` and ``fk_field`` attributes.

def with_respect_to(self):
        """
        Returns a dict to use as a filter for ordering operations
        containing the original ``Meta.order_with_respect_to`` value
        if provided. If the field is a Generic Relation, the dict
        returned contains names and values for looking up the
        relation's ``ct_field`` and ``fk_field`` attributes.
        """
        try:
            name = self.order_with_respect_to
            value = getattr(self, name)
        except AttributeError:
            # No ``order_with_respect_to`` specified on the model.
            return {}
        # Support for generic relations.
        field = getattr(self.__class__, name)
        if isinstance(field, GenericForeignKey):
            names = (field.ct_field, field.fk_field)
            return dict([(n, getattr(self, n)) for n in names])
        return {name: value}