I use ordered model with order_with_respect_to set to something. No ordered item should ever have the same order as another item. So, I try to set in the Meta class, unique_together = ("foreign_key", "order"). When I run .to(order) I get an integrity error because to() temporarily moves around objects and violates the assumption that order is unique. Is there a workaround for this? My application seems to be plagued by accidental order overlaps.