if @exercise_course_groups.present? && @exercise_course_groups.count > 0
  json.course_groups do
    json.array! @exercise_course_groups do |group|
      json.exercise_group_id group[:course_id]  #班级id
      json.exercise_group_name group[:course_name] #班级名称
      json.exercise_group_students group[:student_count]  #班级人数
    end
  end
else
  json.course_groups []
end

#试卷分数的统计

json.exercise_counts do
  json.commit_percent @counts_array[:commit_percent]
  json.min_score @counts_array[:min_score]
  json.max_score @counts_array[:max_score]
  json.average_score @counts_array[:average_score].to_s
  json.fail_counts @counts_array[:fail_counts]
  json.pass_counts @counts_array[:pass_counts]
  json.good_counts @counts_array[:good_counts]
  json.best_counts @counts_array[:best_counts]
end

json.questions_count @exercise_questions_count
json.commit_results do
  json.array! @question_result_hash do |q|
    json.ques_title q[:ques_title]
    json.ques_less_title q[:ques_less_title]
    json.ques_type q[:type]
    json.ques_position q[:position]
    json.right_percent q[:percent]
    json.effictive_counts q[:ques_effictive_counts]
    if q[:type] != Exercise::PRACTICAL
      json.ques_details do
        json.array! q[:ques_details] do |d|
          json.choice_position d[:choice_position]
          json.choice_text d[:choice_text]
          json.choice_users_count d[:choice_users_count]
          json.choice_percent d[:choice_percent]
          json.choice_right_boolean d[:right_answer]
        end
      end
    else
      json.ques_details do
        json.array! q[:ques_details] do |cha|
          json.challenge_id cha[:cha_id]
          json.challenge_name cha[:cha_name]
          json.challenge_position cha[:cha_position]
          json.challenge_details do
            json.array! cha[:cha_details] do |ch|
              json.choice_position ch[:choice_position]
              json.choice_text ch[:choice_text]
              json.choice_users_count ch[:choice_users_count]
              json.choice_percent ch[:choice_percent]
              json.choice_right_boolean ch[:right_answer]
            end
          end
        end
      end
    end
  end
end