module BulletinModel
  module Cache
    require 'active_support/concern'
    extend ActiveSupport::Concern
    included do
      before_save :do_before_save
    end
    def do_before_save
      if self.class == SubPart
        AnnsCache.where(parent_id:self.id).destroy
      elsif self.class == Bulletin
        AnnsCache.all.destroy
      end
    end
  end
end