Filtering the Aggregate in the Django ORM

Question

I have a function that looks like this:

def post_count(self):
        return self.thread_set.aggregate(num_posts=Count(\'post\'))[\'num_posts\']

<

Answer 1

You may want to look at writing a custom Manager object:

http://docs.djangoproject.com/en/1.1/topics/db/managers/

I haven't used aggregate(), but that may let you write a custom manager to provide a filtered active_thread_set and then do self.active_thread_set.aggregate(...). If not, it will let you do the custom SQL and add a num_posts property onto the Thread objects (see the PollManager.with_counts() example.)