docs: def update_count(self):
          """ updates likes and dislikes count """
          node_rating_count = self.node.rating_count
          node_rating_count.likes = self.node.vote_set.filter(vote=1).count()
          node_rating_count.dislikes = self.node.vote_set.filter(vote=-1).count()
          node_rating_count.save()