我的课程/我的项目按照课程/项目最新动态的时间排序

app/controllers/users_controller.rb

@@ -118,7 +118,7 @@ class UsersController < ApplicationController
         return
       end
     end
-    projects = @user.projects.visible.order("updated_on desc")
+    projects = @user.projects.visible.select("projects.*,(SELECT MAX(created_at)  FROM `forge_activities` WHERE forge_activities.project_id = projects.id) AS a").order("a desc")
     if(params[:status] == '1')
       projects = projects.where("projects.user_id = ?",@user.id)
     elsif(params[:status] == '2')
@@ -248,7 +248,7 @@ class UsersController < ApplicationController
         return
       end
     end
-    courses = @user.courses.visible.order("created_at desc")
+    courses = @user.courses.visible.select("courses.*,(SELECT MAX(created_at)  FROM `course_activities` WHERE course_activities.course_id = courses.id) AS a").order("a desc")
     if(params[:status] == '1')
       courses = courses.where("endup_time >= ? or endup_time is null or endup_time=''",Time.now)
     elsif(params[:status] == '2')