Re: Query overhead or not ?

> tags = Tag.objects.all()
>
> for t in tags:
>    indexed_tags[t] = Post.objects.filter(tags__name=t).count()
>
> Next I would sort indexed_tags and I have a dictionary of which tags are used the most.
>
> I'm wondering if this is a good idea ? Since if I have 1000 tags this would require 1000 queries just for one simple tag cloud.
> Is there a better way of solving this without adding an extra count field to the Tag model.

Hi Jonas,

your gut feeling was correct - it's not a very good idea, although
it might work for a small site. You might want to take a look at
database aggregation in Django:
http://docs.djangoproject.com/en/1.2/topics/db/aggregation/

Cheers

Jirka

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