课程列表按创建时间排序

app/controllers/users_controller.rb

@@ -2948,7 +2948,7 @@ class UsersController < ApplicationController
     sort_name = "created_at"
     sort_type = @c_sort == 1 ? "asc" : "desc"
 
-    @courses = @user.courses.visible.where("is_delete =?", 0).select("courses.*,(SELECT MAX(updated_at)  FROM `course_activities` WHERE course_activities.course_id = courses.id) AS a").order("a #{sort_type}")
+    @courses = @user.courses.visible.where("is_delete =?", 0).select("courses.*,(SELECT MAX(created_at)  FROM `course_activities` WHERE course_activities.course_id = courses.id) AS a").order("a #{sort_type}")
 
     #根据 作业+资源数排序
     if @order.to_i == 2