From 6893b3dcab18b532286859c5416befdc5ae6dc6e Mon Sep 17 00:00:00 2001
From: huang <huang.jingquan@163.com>
Date: Wed, 2 Mar 2016 14:56:25 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E5=88=86=E9=A1=B5=E9=97=AE?=
 =?UTF-8?q?=E9=A2=98?=
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---
 app/helpers/users_helper.rb | 40 +++++++++++++++++++------------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/app/helpers/users_helper.rb b/app/helpers/users_helper.rb
index 1e924cefa..b77dfe3bd 100644
--- a/app/helpers/users_helper.rb
+++ b/app/helpers/users_helper.rb
@@ -57,25 +57,27 @@ module UsersHelper
   def get_resource_origin attach
     type = attach.container_type
     content = attach.container
-    case type
-      when 'Course'
-        result = current_time_and_term_resource content
-      when 'Project'
-        result = content.name
-      when 'Issue'
-        result = content.subject
-      when 'Message'
-        result = content.subject
-      when 'News'
-        result = content.title
-      when 'HomewCommon'
-        result = content.name
-      when 'StudentWorkScore'
-        result = content.name
-      when 'Principal'
-        result = content.name
-      when 'OrgSubfield'
-        result = content.name
+    unless content.nil?
+      case type
+        when 'Course'
+          result = current_time_and_term_resource content
+        when 'Project'
+          result = content.name
+        when 'Issue'
+          result = content.subject
+        when 'Message'
+          result = content.subject
+        when 'News'
+          result = content.title
+        when 'HomewCommon'
+          result = content.name
+        when 'StudentWorkScore'
+          result = content.name
+        when 'Principal'
+          result = content.name
+        when 'OrgSubfield'
+          result = content.name
+      end
     end
   end