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

    # 试卷的描述
    Exercise.find_each do |e|
      exercise_description = ke_transform_to_md e.exercise_description
      puts("#exercise_description: #{exercise_description}")
      e.update_column(:exercise_description, exercise_description)
    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
    ExerciseBankQuestion.find_each do |ebq|
      question_title = ke_transform_to_md ebq.question_title
      puts("#question_title: #{question_title}")
    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




    StudentWork
    HomeworkCommon
    JournalsForMessage
    GraduationTask
    GraduationTopic
    GraduationWork
    GtaskBank
    GtopicBank
    HomeworkBank
    QuestionBank

    ExerciseBankStandardAnswer
    Memo




  end
end