code: def delete(self, using=None):
          
          if self.is_alone:
              # The default way of operating is to trigger the deletion of the associated topic
              # only if the considered post is the only post embedded in the topic
              self.topic.delete()
          else:
              super(AbstractPost, self).delete(using)
              self.topic.update_trackers()
docs: Deletes the post instance.