class AddAttachmentsToCourses < ActiveRecord::Migration
  def change
    Course.where(:id => CourseActivity.where("updated_at > '2017-06-01 00:00:00'").map(&:course_id).uniq).each do |course|
      attachments = Attachment.where(:container_type => 'Course', :container_id => course.syllabus.courses.map(&:id))
      attachments.each do |attachment|
        if Attachment.where(:container_type => 'Course', :container_id => course.id, :filename => attachment.filename).count == 0
          attach_copied_obj = attachment.copy
          attach_copied_obj.tag_list.add(attachment.tag_list) # tag关联
          attach_copied_obj.container = course
          attach_copied_obj.created_on = attachment.created_on
          attach_copied_obj.author_id = attachment.author_id
          attach_copied_obj.copy_from = attachment.copy_from.nil? ? attachment.id : attachment.copy_from
          attach_copied_obj.is_publish = 1
          #attach_copied_obj.publish_time = Time.now + 30.days
          if attach_copied_obj.attachtype == nil
            attach_copied_obj.attachtype = 4
          end
          attach_copied_obj.save
          quo_attachments = Attachment.find_by_sql("select * from attachments where copy_from = #{attach_copied_obj.copy_from} or id =  #{attach_copied_obj.copy_from}")
          result = Attachment.find_by_sql("select count(*) as number from attachments where copy_from = #{attach_copied_obj.copy_from}")
          if result.nil? || result.count <= 0
            count = 0
          else
            count = result[0].number
          end
          attach_copied_obj.quotes = count
          attach_copied_obj.save
          quo_attachments.each do |att|
            att.quotes = attach_copied_obj.quotes
            att.save
          end
          #update_quotes attach_copied_obj
        end
      end
    end
  end
end