class IndexListView(ListView):
    model = Post
    template_name = 'blog/index.html'
    queryset = Post.objects.prefetch_related(
        'comments'
    ).select_related('author').filter(
        pub_date__lt=tz.now(),
        is_published=True,
        category__is_published=True,
    ).annotate(comment_count=Count('comments'))

    ordering = '-pub_date'
    paginate_by = NUM_PAGES