试卷的统计结果页面，选择题的正确率

app/helpers/exercises_helper.rb

@@ -116,12 +116,8 @@ module ExercisesHelper
 
         #计算每个问题的答案人数
         user_ids.each do |user_id|
-          user_an_choice = ex_answers.where(user_id:user_id)
-          answer_choice_array = []
-          user_an_choice.each do |a|
-            answer_choice_array.push(a.exercise_choice.choice_position)  #学生答案的位置
-          end
-          if answer_choice_array == standard_answer
+          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
@@ -129,7 +125,7 @@ module ExercisesHelper
         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
           answer_this_choice = effictive_users.search_exercise_answer("exercise_choice_id",c.id)
-          answer_users_count = answer_this_choice.count
+          answer_users_count = answer_this_choice.size
           if effictive_users_count == 0
             answer_percent = 0.0
           else
@@ -170,7 +166,6 @@ module ExercisesHelper
           else
             answer_percent = (user_count / effictive_users_count.to_f ).round(3)
           end
-
           answer_option = {
               :choice_position => index+1,
               :choice_text => s_choice_text,
@@ -200,9 +195,9 @@ module ExercisesHelper
         question_answer_infos.push(wrong_answer_position)
       elsif ex.question_type == Exercise::SUBJECTIVE  #主观题
         ex_score = ex&.question_score
-        full_scores = effictive_users.search_exercise_answer("score",ex_score).count  #满分人数
-        no_full_scores = effictive_users.exercise_no_full_scores(ex_score).count  #部分分数人数
-        zero_scores = effictive_users.search_exercise_answer("score",0.0).count  #包含为0分的，及未评阅的
+        full_scores = effictive_users.search_exercise_answer("score",ex_score).size  #满分人数
+        no_full_scores = effictive_users.exercise_no_full_scores(ex_score).size  #部分分数人数
+        zero_scores = effictive_users.search_exercise_answer("score",0.0).size  #包含为0分的，及未评阅的
         un_review_scores = effictive_users_count - full_scores - no_full_scores - zero_scores   #未评阅数
         if un_review_scores < 0
           un_review_scores = 0
@@ -415,7 +410,7 @@ module ExercisesHelper
             user_answer_content = answer_choice_array.sort
             standard_answer = q.exercise_standard_answers.pluck(:exercise_choice_id).sort  #该问题的标准答案，可能有多个
             if user_answer_content == standard_answer  #答案一致,多选或单选才给分，答案不对不给分
-              if standard_answer.count > 0
+              if standard_answer.size > 0
                 q_score_1 = q.question_score
                 # q_score_1 = (q.question_score.to_f / standard_answer.count)   #当多选答案正确时，每个answer的分数均摊。
               else