Python Forum

Hey there everybody! I am trying to return the number of threads and posts that belong to that specific forum. The structure is like this: Category -> Forum -> Thread.
Look at the picture attached

I want to query the database for all threads and posts that belong to that Forum and get the count of each.

This is my current code:

Models.py

class Forum(models.Model):
    name = models.CharField(max_length=255)
    description = models.CharField(max_length=255)
    category = models.ForeignKey(Category, on_delete=models.CASCADE, related_name='forums')

    def __str__(self):
        return self.name


class Thread(models.Model):
    name = models.CharField(max_length=255)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    date = models.DateTimeField(auto_now_add=True)
    thread_forum = models.ForeignKey(Forum, on_delete=models.CASCADE)

    def __str__(self):
        return self.name

class Post(models.Model):
    post_body = models.TextField(blank=True, null=True)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    post_date = models.DateTimeField(auto_now_add=True)
    post_thread = models.ForeignKey(Thread, on_delete=models.CASCADE)

    def __str__(self):
        return str(self.id) + ' | ' + str(self.author)

Views.py

class HomeView(ListView):
    context_object_name = 'name'
    template_name = 'index.html'
    queryset = Category.objects.all()

    def get_context_data(self, *args, **kwargs):
        context = super(HomeView, self).get_context_data(*args, **kwargs)
        return context

index.html

{% for forum in category.forums.all %}
  <div class="container-fluid forum-threads clearfix">
    <div class="forum_threads_count">
      100
    </div>
    <div class="forum_threads_threads">
      <span>Threads</span>
    </div>
  </div>
  <div class="container-fluid forum-posts clearfix">
    <div class="forum_posts_count">100</div>
    <div class="form_posts_text">
    <span>Posts</span>
    </div>
    </div>
   <div class="container-fluid forum-latest-posts clearfix">

{% endfor %}

I wish I could do this inside index.html but I can't:

{{ Thread.filter(forum=forum).count()) }}

Got any ideas for a simple way to incorporate this? Thank you!

Taz