class AlterHomeworkEndTime < ActiveRecord::Migration
  def up
    homeworks = HomeworkCommon.where("id in (3229, 3234, 3235, 3236)");
    unless homeworks.empty? || homeworks.nil?
      homeworks.each do |hw|
        hw.end_time = hw.end_time + 4
        hm = hw.homework_detail_manual
        hm.comment_status = 1
        hw.student_works.each do |stu|
          stu.late_penalty = 0
          stu.save
        end
        hm.save
        hw.save
      end
    end
  end

  def down
  end
end