调整

app/models/exercise.rb

@@ -43,11 +43,11 @@ class Exercise < ActiveRecord::Base
   end
 
   def user_question_list exercise_user_id
-    if self.exercise_user_questions.where(exercise_user_id: exercise_user_id).count == 0
+    if self.exercise_user_questions.where(exercise_user_id: exercise_user_id).size == 0
       self.exercise_questions
     else
       self.exercise_questions.where(id: self.exercise_user_questions.where(exercise_user_id: exercise_user_id).
-          pluck(:exercise_question_id))
+          limit(self.questions_count).pluck(:exercise_question_id))
     end
   end
 
@@ -55,6 +55,10 @@ class Exercise < ActiveRecord::Base
     self.exercise_level_settings.where(level: level).first
   end
 
+  def questions_count
+    self.exercise_questions.where("question_type != 5").size + self.shixun_question_count
+  end
+
   def shixun_question_count
     self.exercise_level_settings.sum(:num)
   end