class UpdateMessageTime < ActiveRecord::Migration
  def up
    course_count = CourseMessage.all.count / 30 + 1
    transaction do
      for i in 1 ... course_count do i
      CourseMessage.page(i).per(30).each do |cmessage|
        if cmessage.course_message
          if cmessage.course_message.respond_to?("created_at")
            cmessage.created_at = cmessage.course_message.created_at
          elsif cmessage.course_message.respond_to?("created_on")
            cmessage.created_at = cmessage.course_message.created_on
          end
          cmessage.save

          course_all_message = MessageAll.where("message_type = '#{cmessage.class.to_s}' and message_id = '#{cmessage.id}'").first
          course_all_message.created_at = cmessage.created_at
          course_all_message.save
        end
      end
      end
    end
  end

  def down
  end
end