Merge branch 'dev_aliyun' of http://bdgit.educoder.net/Hjqreturn/educoder into dev_aliyun

app/helpers/exercises_helper.rb

@@ -115,12 +115,14 @@ module ExercisesHelper
         right_users_count = 0  #该问题的回答正确的人数
 
         #计算每个问题的答案人数
+        effictive_users.transaction do
           user_ids.each do |user_id|
             answer_choice_array = effictive_users.where(user_id:user_id)&.map {|s| s.exercise_choice.choice_position}.uniq
             if answer_choice_array.sort == standard_answer
               right_users_count += 1
             end
           end
+        end
         percent = effictive_users_count > 0 ? (right_users_count / effictive_users_count.to_f).round(3)*100 : 0.0
         ex.exercise_choices.each do |c|
           right_answer = standard_answer.include?(c.choice_position)   #选项的标准答案为选项的位置