How to count related objects of several users in Django? - django

Question

In a simple forum app in Django, on each thread I want to render posts by several users on the same page (like what you see on VB and other classic forums).
Here are the models:
class Post(models.Model):
title = models.CharField(max_length=75, null=True, blank=True)
created = models.DateTimeField(auto_now_add=True)
creator = models.ForeignKey(User, blank=True, null=True)
updated = models.DateTimeField(auto_now=True)
topic = models.ForeignKey(Topic)
body = models.TextField(max_length=10000)
class Topic(models.Model):
title = models.CharField(max_length=100)
description = models.TextField(max_length=10000, null=True)
forum = models.ForeignKey(Forum)
created = models.DateTimeField()
creator = models.ForeignKey(User, blank=True, null=True)
updated = models.DateTimeField(auto_now=True)
closed = models.BooleanField(blank=True, default=False)
published = models.BooleanField(blank=True, default=False)
visits = models.IntegerField(default = 0)
weight = models.IntegerField(blank=True, default=0)
slug = models.CharField(max_length=100, blank=True)
def num_posts(self):
return self.post_set.count()
def num_replies(self):
return max(0, self.post_set.count() - 1)
def last_post(self):
if self.post_set.count():
return self.post_set.order_by("-created")[0]
def __unicode__(self):
return unicode(self.creator) + " - " + self.title
def save(self, *args, **kwargs):
super(Topic, self).save(*args, **kwargs)
I have also this wierd model:
class PostCount(models.Model):
user = models.OneToOneField(User)
posts = models.IntegerField(default=0)
#classmethod
def create(cls, user):
postcount = cls(user=user)
return postcount
Which somehow magically returns number of topics by a user (not number of posts) so that they can be accessed in the template using {{topic.creator.postcount.posts}}.
And the view that render topics:
def topic(request, topic_id):
"""Listing of posts in a topic."""
posts = Post.objects.filter(topic=topic_id).order_by("created")
posts = mk_paginator(request, posts, DJANGO_SIMPLE_FORUM_REPLIES_PER_PAGE)
topic = Topic.objects.get(pk=topic_id)
topic.visits += 1
topic.save()
forum = topic.forum
return render_to_response("myforum/topic.html", add_csrf(request, posts=posts, pk=topic_id,
topic=topic, forum= forum), context_instance=RequestContext(request))
I've tried this
posts = Post.objects.filter(topic=topic_id).order_by("created").annotate(creator_post_count=Count(creator__post_set))
but it did not work.
So I'm wondering how best to count number of posts by a user in template?

Answer 1

Have you tried this? :
posts = Post.objects.filter(topic=topic_id).order_by('created').annotate(creator_post_count=Count('creator__post_set_id', distinct=True))
or to print {{ topic.creator.post_set.count }} directly in the template ?