diff --git a/app/helpers/homework_commons_helper.rb b/app/helpers/homework_commons_helper.rb
index 261fc85e9..c77ae5937 100644
--- a/app/helpers/homework_commons_helper.rb
+++ b/app/helpers/homework_commons_helper.rb
@@ -65,7 +65,7 @@ module HomeworkCommonsHelper
 
           # 作业统一设置、游客身份、超级管理员、分班权限不限的老师身份
           if homework_common.unified_setting || identity > Course::STUDENT || identity == Course::ADMIN ||
-              (identity < Course::STUDENT && teacher_course_groups.size == 0)
+              (identity < Course::STUDENT && teacher_course_groups.blank?)
             case ho_detail_manual.comment_status
               when 0
                 status << "未发布"