1

app/models/exercise.rb

@@ -30,6 +30,7 @@ class Exercise < ActiveRecord::Base
   end
 
   def create_user_question_list exercise_user_id
+    self.exercise_user_questions.where(exercise_user_id: exercise_user_id).destroy_all
     self.exercise_questions.where("question_type != 5").each do |question|
       ExerciseUserQuestion.create(exercise_id: self.id, exercise_user_id: exercise_user_id, exercise_question_id: question.id)
     end

db/migrate/20190506070751_migrate_exercise_user_questions.rb

@@ -0,0 +1,30 @@
+class MigrateExerciseUserQuestions < ActiveRecord::Migration
+  def up
+    exercise = Exercise.where(:id => 1031).first
+    if exercise.present?
+      exercise.exercise_users.each do |exercise_user|
+        # 分配的实训题数量多于6个的（撤销发布过的学生会有12个题）则删除前六个题
+        if exercise_user.exercise_user_questions.where(:exercise_id => exercise.id).count > 6
+          exercise_user.exercise_user_questions[0..5].each do |question|
+            question.destroy
+          end
+        end
+
+        # 分数超过一百分的需要重新计算得分
+        if exercise_user.objective_score > 100.0
+          score = 0
+          ExerciseUserQuestion.where(exercise_user_id: exercise_user.id, exercise_id: exercise.id).each do |question|
+            question.exercise_shixun_challenges.each do |exercise_cha|
+              score += exercise_cha.exercise_shixun_answers.where(user_id => exercise_user.user_id).try(:score).to_f
+            end
+          end
+
+          exercise_user.update_attributes(score: score, objective_score: score)
+        end
+      end
+    end
+  end
+
+  def down
+  end
+end