forgeplus/db/migrate/20200429085544_change_quill_to_md.rb

class ChangeQuillToMd < ActiveRecord::Migration[5.2]
  #迁移quill编辑器的内容为md
  def change
    migrate_time = Time.current - 20.days 

    all_issues = Issue.where("updated_on > ?", migrate_time)
    pros = PullRequest.where("updated_at > ?", migrate_time)
    journals = Journal.where("created_on > ?", migrate_time)


    Issue.transaction do
      if all_issues.size > 0 
        all_issues.each do |i|
          description = i.description
          if description.present? && description.include?("insert")
            new_content = change_content(description)
            i.update_attribute(:description, new_content)
          end
          puts "__update_issue_content_____id:#{i.id}__"
        end
      end
    end

    Journal.transaction do 
      if journals.size > 0
        journals.each do |j|
          description = j.notes
          if description.present? && description.include?("insert")
            new_content = change_content(description)
            j.update_attribute(:notes, new_content)
          end
          puts "__update_journal_content_____id:#{j.id}__"
        end
      end
      
    end

    PullRequest.transaction do 
      if pros.size > 0
        pros.each do |p|
          description = p.body
          if description.present? && description.include?("insert")
            new_content = change_content(description)
            p.update_attribute(:body, new_content)
          end
          puts "__update_pull_request_content_____id:#{p.id}__"
        end
      end
    end
  end

  def change_content(content)
    puts "####________content_____######{content}"
    new_content = ""
    return "" if content.blank?
    desc = JSON.parse(content)["ops"]
    unless desc.length > 0
      desc.each do |d|
        image = d["insert"]["image"]
        if image.present?
          new_content += "![#{image['alt']}](#{image['url']})"
        else
          new_content += d["insert"].gsub("\n", "")
        end
      end
    end
    new_content
  end
end