ex_user_info = exercise_use_info(exercise_user,user_status,exercise)

json.user_id ex_user_info[:user_id]
json.user_name ex_user_info[:user_name]
json.login ex_user_info[:login]
json.user_group_id ex_user_info[:user_group_id]
json.user_group_name ex_user_info[:user_group_name]
json.student_id ex_user_info[:student_id]
json.commit_status ex_user_info[:commit_status]
json.end_at ex_user_info[:end_at]
if subjective_type == 1
  json.objective_score ex_user_info[:ex_object_score]
  json.subjective_score ex_user_info[:ex_subject_score]
end
json.score ex_user_info[:score]
json.review_status ex_user_info[:teacher_review]  #教师是否评阅，评阅则为true，否则为false