From 8b0b31f749b11509ef3b0bdc2eb4607deb01d634 Mon Sep 17 00:00:00 2001
From: nwb <nwb5@hotmail.com>
Date: Thu, 24 Jul 2014 11:20:33 +0800
Subject: [PATCH] =?UTF-8?q?=E9=99=84=E4=BB=B6=E4=B8=8B=E8=BD=BD=E6=9B=B4?=
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---
 app/controllers/attachments_controller.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 6c22d8de2..a0da2d025 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -286,7 +286,7 @@ private
     raise ActiveRecord::RecordNotFound if params[:filename] && params[:filename] != @attachment.filename
     if @attachment.container_type == 'Course'
       @course = @attachment.course
-    elsif @attachment.container.course
+    elsif @attachment.container.has_attribute?(:course) && @attachment.container.course
       @course = @attachment.container.course
     else
       unless @attachment.container_type == 'Bid' || @attachment.container_type == 'HomeworkAttach' || @attachment.container_type == 'Memo' || @attachment.container_type == 'Softapplication'