class ModifyAnswerForChallenges < ActiveRecord::Migration[5.2]
  def change
    challenges = Challenge.where("answer is not null or answer != ''")
                     .includes(:challenge_answers).unscoped
    challenges.find_each do |c|
      next if c.challenge_answers.present?
      puts("############challenge_id:##{c.id}")
      ChallengeAnswer.create(name: "解题代码", contents: "#{c.answer}", level: 1, score: 100, challenge_id: c.id)
    end
  end
end