def add_comment(request, post_id):
    post_ = Post.objects.get(pk=post_id)
    if request.method == 'POST':
        form = CommentForm(request.POST)
        if form.is_valid():
            post_.comment_set.add(form)
    else:
        form = CommentForm()
    return render(request, 'blog/add_comment.html', {"form": form})