class DeleteAnonymousWork < ActiveRecord::Migration
  def up
    student_works = StudentWork.where("homework_common_id = 2882").map{|work| work.id} unless StudentWork.where("homework_common_id = 2882").empty?
    student_work_ids = "(" + student_works.join(",") + ")"
    student_work_scores = StudentWorksScore.where("student_work_id in #{student_work_ids}")
    unless student_work_scores.empty?
      student_work_scores.each do |sscore|
      student_work = StudentWork.find sscore.student_work_id
      student_work.student_score = 0 unless student_work.nil?
      student_work.absence_penalty = 0
      sscore.destroy
      student_work.save
      end
    end
  end

  def down
  end
end