修改课程删除后可以显示的问题

app/controllers/users_controller.rb

@@ -875,7 +875,7 @@ class UsersController < ApplicationController
   #显示更多用户课程
   def user_courses4show
     @page = params[:page].to_i + 1
-    @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").limit(5).offset(@page * 5)
+    @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 desc").limit(5).offset(@page * 5)
   end
 
   #显示更多用户项目