class Comment < ActiveRecord::Base belongs_to :user belongs_to :answer validates :user_id, presence: true validates :answer_id, presence: true validates :content, length: { maximum: 160 } after_create do Notification.notify answer.user, self unless answer.user == self.user user.increment! :commented_count answer.increment! :comment_count end before_destroy do Notification.denotify answer.user, self unless answer.user == self.user user.decrement! :commented_count answer.decrement! :comment_count end def notification_type(*_args) Notifications::Commented end end