Django: updating a field with a progressive number within an ordered queryset

Using Django 1.2.3, I need to u开发者_运维知识库pdate a model field with a ranking among an ordered set of instances, without having to retrieve the entire queryset and update each model by hand.

Is there a way to achieve that?

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I think this is what you need: http://docs.djangoproject.com/en/dev/topics/db/queries/#updating-multiple-objects-at-once