老师评分之后，提交批阅结果按钮消失

app/controllers/student_work_controller.rb

@@ -120,6 +120,7 @@ class StudentWorkController < ApplicationController
   #添加评分，已评分则为修改评分
   def add_score
     @score = student_work_score @work,User.current
+    @is_teacher = User.current.allowed_to?(:as_teacher,@course)
     if @score
       @score.comment = params[:new_form][:user_message] if params[:new_form] && params[:new_form][:user_message] && params[:new_form][:user_message] != ""
       @score.score = params[:score] if params[:score]