diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 5e8f7b67e..a9843a5cc 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -200,7 +200,7 @@ class HomeworkCommonsController < ApplicationController
           if @user_course_identity >= Course::STUDENT
             tip_exception(403, "无权限操作")
           else
-            if @work_excel.size > 0
+            if @work_excel.present?
               student_work_to_xlsx(@work_excel,@homework)
               exercise_export_name = current_user.real_name + "_" + @course.name + "_" + @homework.name + "_" + Time.now.strftime('%Y%m%d_%H%M%S')
               render xlsx: "#{exercise_export_name.strip.first(30)}",template: "homework_commons/works_list.xlsx.axlsx",locals: