json.total_counts @total_exercise_counts

json.total_user_exercises do
  json.array! @all_exercise_stu_array do |a|
    json.student_exercise do
      json.partial! "exercises/user_exercise_info",locals:{exercise:@exercise,
                                                           is_teacher_or:a[:is_teacher],
                                                           ex_answerer:a[:ex_answerer],
                                                           exercise_user:a[:ex_user],
                                                           ex_obj_array:a[:ex_obj_array],
                                                           ex_sub_array:a[:ex_sub_array],
                                                           exercise_questions:@exercise_questions,
                                                           student_status:@student_status,
                                                           question_status:@question_status
      }
    end
  end
end