json.exercise do
  json.extract! exercise, :id, :exercise_name,:exercise_description,:exercise_status,:answer_open
  json.student_commit_status student_status   #当前为学生且已提交时
end

json.exercise_answer_user do
  json.is_teacher is_teacher_or
  json.user_name ex_answerer.real_name
  json.user_id ex_answerer.id
  json.login ex_answerer.login
  if exercise_user.present?
    json.start_at exercise_user.start_at
    json.score exercise_user.score.present? ? exercise_user.score.round(1).to_s : "0.0"
  end
end

all_question_status = []
if student_status == 2
  #试卷的全部分数
  json.exercise_scores do
    json.partial! "exercises/exercise_scores"
    #试卷的客观题分数及是否错误
    json.objective_scores do
      json.partial! "exercises/question_scores", question_scores: ex_obj_array  #客观问题正确与否的显示
    end

    #试卷的主观题及是否错误
    json.subjective_scores do
      json.partial! "exercises/question_scores", question_scores: ex_sub_array  #主观题正确与否的显示
    end
  end

#主观题及客观题的全部分数及正确与否的状态
  all_question_status = ex_obj_array + ex_sub_array
elsif student_status == 1
  json.question_status question_status
end

exercise_status = exercise.get_exercise_status(ex_answerer.id)

#当前为老师，或为学生，但在试卷截止后且答案选择公开的
if is_teacher_or == 1 || (exercise_status == 3 && exercise.answer_open)
  ex_type = 4
else
  ex_type = 3
end

json.exercise_questions do
  json.array! exercise_questions do |q|

    user_ques_answers = user_question_answers(q,ex_answerer.id,student_status,is_teacher_or,exercise_status,q.question_type,ex_type)
    user_ques_comments = user_ques_answers[:question_comment]
    if all_question_status.size > 0
      this_ques_status = all_question_status.detect {|f| f[:q_id] == q.id}
      json.answer_status this_ques_status[:stand_status]
    end
    json.user_score user_ques_answers[:user_score].to_s
    json.partial! "exercise_questions/exercise_questions",
                  question: q,
                  ex_answerer: ex_answerer,
                  choices:q.exercise_choices,
                  shixun_challenges: q.exercise_shixun_challenges,
                  exercise_type: ex_type,
                  user_answer: user_ques_answers[:answered_content],
                  shixun_type: user_ques_answers[:shixun_type]
    if user_ques_comments.count > 0
      json.question_comments do
        json.partial! "exercises/exercise_comments", question_comment:user_ques_answers[:question_comment].first
      end
    else
      json.question_comments []
    end
  end
end


#exercise_type 表示选择公用的模板类型，1为教师预览/编辑，2为空白试卷,3表示学生开始答题/答题未截止。