cbv.py

class PostDetailView(DetailView):
    model = Post
    slug_field = 'slug'
    slug_url_kwarg = 'post'
    context_object_name = 'post'
    template_name = 'blog/post/detail.html'

    def get_queryset(self):
        return self.model.objects.filter(
            publish__day=self.kwargs['day'],
            publish__year=self.kwargs['year'],
            publish__month=self.kwargs['month'],
        )