“我的作业”中不应出现已删除课程的作业

app/controllers/users_controller.rb

@@ -452,7 +452,7 @@ class UsersController < ApplicationController
         user_course_ids =  @user.courses.empty? ? "(-1)" :"(" + @user.courses.visible.map{|course| course.id}.join(",") + ")"
 
         #判断当前用户在当前课程的身份
-        visibleCourse = @user.courses.empty? ? [] : @user.courses.visible
+        visibleCourse = @user.courses.empty? ? [] : @user.courses.where("is_delete = 0").visible
         homework_ids = []
         visibleCourse.each do |course|
             homeworks = HomeworkCommon.where("course_id = #{course.id} and publish_time <= '#{Date.today}'")