I'm having a attribute on my model to allow the user to order the objects. I have to update the element's order depending on a list, that contains the object's ids in the new order; right now I'm iterating over the whole queryset and set one objects after the other. What would be the easiest/fastest way to do the same with the whole queryset?

def update_ordering(model, order):
    """ order is in the form [id,id,id,id] for example: [8,4,5,1,3] """
    id_to_order = dict((order[i], i) for i in range(len(order)))
    for x in model.objects.all():
        x.order = id_to_order[x.id]
        x.save()