class ModifyKeContentsForMarkdown < ActiveRecord::Migration[5.2]
  include ActionView::Helpers::SanitizeHelper
  def change
    # def ke_transform_to_md content
    #   sanitize(content, tags: %w(img a span), attributes: %w(src href target style))
    #       .gsub(/^(\n)/, "").gsub(/(\n)+/, "<br />").gsub(/$(\n)/, "")
    #       .gsub(/(\n)+/, "<br />").gsub("\t", "&nbsp;&nbsp;&nbsp;&nbsp;")
    # end
    #
    # # 课程讨论区
    # MessageDetail.find_each do |m|
    #   content = ke_transform_to_md m.content
    #   puts("content:#{content}")
    #   m.update_column(:content, content)
    # end
    #
    # # 试卷的标题
    # ExerciseQuestion.find_each do |eq|
    #   question_title = ke_transform_to_md eq.question_title
    #   puts("question_title:#{question_title}")
    #   eq.update_column(:question_title, question_title)
    # end
    #
    # # 试卷的答案
    # ExerciseStandardAnswer.find_each do |esa|
    #   answer_text = ke_transform_to_md esa.answer_text
    #   puts("answer_text: #{answer_text}")
    #   esa.update_column(:answer_text, answer_text)
    # end
    #
    # # 试卷题库的问题标题
    # ExerciseBankQuestion.find_each do |ebq|
    #   question_title = ke_transform_to_md ebq.question_title
    #   puts("#question_title: #{question_title}")
    #   ebq.update_column(:question_title, question_title)
    # end
    #
    # # 试卷答案
    # ExerciseBankStandardAnswer.find_each do |ebsa|
    #   answer_text = ke_transform_to_md ebsa.answer_text
    #   puts("#answer_text: #{answer_text}")
    #   ebsa.update_column(:answer_text, answer_text)
    # end
    #
    # # 问卷的标题
    # PollQuestion.find_each do |pq|
    #   question_title = ke_transform_to_md pq.question_title
    #   puts("question_title:#{question_title}")
    #   pq.update_column(:question_title, question_title)
    # end
    #
    # # 学生的作品
    # StudentWork.find_each do |sw|
    #   description  = ke_transform_to_md sw.description
    #   puts("#description: #{description}")
    #   sw.update_column(:description, description)
    # end
    #
    # # 作业
    # HomeworkCommon.find_each do |hc|
    #   description = ke_transform_to_md hc.description
    #   reference_answer = ke_transform_to_md hc.reference_answer
    #   explanation = ke_transform_to_md hc.explanation
    #   hc.update_attributes(description: description, reference_answer: reference_answer, explanation: explanation)
    # end
    #
    # # 作业题库
    # HomeworkBank.find_each do |hb|
    #   description = ke_transform_to_md hb.description
    #   reference_answer = ke_transform_to_md hb.reference_answer
    #   hb.update_attributes(description: description, reference_answer: reference_answer)
    # end
    #
    # # 课堂评论
    # JournalsForMessage.find_each do |jfm|
    #   notes = ke_transform_to_md jfm.notes
    #   puts("#notes: #{notes}")
    #   jfm.update_column(:notes, notes)
    # end
    #
    # # 毕业任务
    # GraduationTask.find_each do |gt|
    #   description = ke_transform_to_md gt.description
    #   puts("#description: #{description}")
    #   gt.update_column(:description, description)
    # end
    #
    # # 毕设选题
    # GraduationTopic.find_each do |gt|
    #   description = ke_transform_to_md gt.description
    #   puts("#description: #{description}")
    #   gt.update_column(:description, description)
    # end
    #
    # # 毕设作品
    # GraduationWork.find_each do |gw|
    #   description = ke_transform_to_md gw.description
    #   puts("#description: #{description}")
    #   gw.update_column(:description, description)
    # end
    #
    # # 毕设任务题库
    # GtaskBank.find_each do |gb|
    #   description = ke_transform_to_md gb.description
    #   puts("#description: #{description}")
    #   gb.update_column(:description, description)
    # end
    #
    # # 毕设选题题库
    # GtopicBank.find_each do |gb|
    #   description = ke_transform_to_md gb.description
    #   puts("#description: #{description}")
    #   gb.update_column(:description, description)
    # end
    #
    # # 交流问答
    # Memo.find_each do |m|
    #   content = ke_transform_to_md m.content
    #   puts("#description: #{content}")
    #   m.update_column(:content, content)
    # end

  end
end