个人主页，助教不可以关闭课程。修改张生代码

app/controllers/courses_controller.rb

@@ -604,7 +604,7 @@ class CoursesController < ApplicationController
 
   def toggleCourse
     @course_prefs = Course.find_by_extra(@course.extra)
-    unless (@course_prefs.student != User.current || User.current.admin?)
+    unless (User.current.allowed_to?(:as_teacher,@course_prefs) || User.current.admin?)
       render_403
     end
   end