code: def unfollow(*models)
        models.each do |model|
          unless model == self or !self.follower_of?(model) or !model.followee_of?(self) or self.cannot_follow.include?(model.class.name) or model.cannot_followed.include?(self.class.name)
            model.followers.by_model(self).first.destroy
            self.followees.by_model(model).first.destroy
          end
        end
      end
docs: unfollow some model