Fix bug.

config/routes.rb

@@ -13,6 +13,7 @@ Rails.application.routes.draw do
         answer_group.last_modified = survey_answers.last.updated_at
         answer_group.survey_answer_ids = survey_answers.map{|a| a.id}
         answer_group.save
+        survey_answers.each{|a| a.updated_at = a.created_at;a.save}
       end
       survey.already_fix_data = true
       survey.survey_questions.each do |q|