announcement-test/lib/announcement/migrate.rb

module Announcement
  module Migrate
    def self.call
      puts ['announcement migrate start']
      gem_root = Announcement::Engine.root
      require File.join(gem_root, 'app/models/announcement_setting')
      require File.join(gem_root, 'app/models/bulletin')
      require File.join(gem_root, 'app/models/bulletin_feed')
      require File.join(gem_root, 'app/models/bulletin_feed_cache')
      require File.join(gem_root, 'app/models/anns_cache')

      setting = AnnouncementSetting.first || AnnouncementSetting.create

      if !setting.migrate_flag.include?("v1")
        Bulletin.all.pluck(:id, :title).each do |id, title_translations|
          if title_translations.nil?
            next
          end
          Bulletin.where(id: id).view.update_many({
              "$set" => {
                title_plain_text: OrbitHelper.get_plain_text_translations(title_translations)
              }
          })
        end

        setting.migrate_flag << "v1"
        setting.save
      end

      AnnsCache.all.delete

      #solve bug for thousands of generated feed cache
      if BulletinFeedCache.count > BulletinFeed.count*5
        BulletinFeedCache.collection.drop
      end
      BulletinFeedCache.regenerate_all

      puts ['announcement migrate end']
    end
  end
end