From 96650b951ab733bb5a1d9c9ed60863a9ae9fa1d5 Mon Sep 17 00:00:00 2001
From: yuanke <249218296@qq.com>
Date: Wed, 28 Sep 2016 16:50:34 +0800
Subject: [PATCH] =?UTF-8?q?=E8=B5=84=E6=BA=90=E7=BC=93=E5=AD=98=E7=9B=B8?=
 =?UTF-8?q?=E5=85=B3BUG=E4=BF=AE=E6=94=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/models/attachment.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index 6e215e128..bb5a54dfc 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -686,7 +686,9 @@ class Attachment < ActiveRecord::Base
   #更新时间
   def update_others
     if self.course
-      self.course.update_course
+      if self.course.is_a?(::Course)
+        self.course.update_course
+      end
     end
   end
 end