class UpdateCourseActivityTime < ActiveRecord::Migration
  def up
    count = CourseActivity.all.count / 10 + 1
    transaction do
      for i in 1 ... count do i
      CourseActivity.page(i).per(10).each do |activity|
        if activity.course_act
          if activity.course_act.respond_to?("created_at")
            activity.created_at = activity.course_act.created_at
          elsif activity.course_act.respond_to?("created_on")
            activity.created_at = activity.course_act.created_on
          end
          activity.save
        end
      end
      end
    end
  end

  def down
  end
end