作业的最后更新时间为作品的最新提交时间

app/controllers/student_work_controller.rb

@@ -173,6 +173,12 @@ class StudentWorkController < ApplicationController
       end
 
       if student_work.save
+        course_activity = CourseActivity.where("course_act_type='HomeworkCommon' and course_act_id =#{@homework.id}").first
+        course_activity.updated_at = Time.now
+        course_activity.save
+        user_activity = UserActivity.where("act_type='HomeworkCommon' and act_id =#{@homework.id}").first
+        user_activity.updated_at = Time.now
+        user_activity.save
         respond_to do |format|
           format.html {
             flash[:notice] = l(:notice_successful_create)