From 3e9f3f4e709c9976ab0226fa34f7a4f16b27c061 Mon Sep 17 00:00:00 2001
From: sw <939547590@qq.com>
Date: Thu, 13 Aug 2015 15:00:13 +0800
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---
 app/helpers/courses_helper.rb | 46 ++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/app/helpers/courses_helper.rb b/app/helpers/courses_helper.rb
index 27a973213..ac142f5a1 100644
--- a/app/helpers/courses_helper.rb
+++ b/app/helpers/courses_helper.rb
@@ -682,28 +682,30 @@ module CoursesHelper
     # activity = CourseActivity.first
     title = ""
     url = ""
-    case activity.course_act_type
-      when "Course"
-        title = activity.course_act.name
-        url = course_path activity.course
-      when "HomeworkCommon"
-        title = "作业&nbsp;" + activity.course_act.name
-        url = student_work_index_path(:homework => activity.course_act.id)
-      when "News"
-        title = "通知公告&nbsp;" + activity.course_act.title
-        url = course_news_index_path(activity.course)
-      when "Attachment"
-        title = "课件&nbsp;" + activity.course_act.filename
-        url = course_files_path(activity.course)
-      when "Message"
-        title = "课程讨论区&nbsp;" + activity.course_act.subject
-        url = course_boards_path(activity.course,:parent_id => activity.course_act.parent_id ? activity.course_act.parent_id : activity.course_act.id, :topic_id => activity.course_act.id)
-      when "JournalsForMessage"
-        title = "留言&nbsp;" + activity.course_act.notes
-        url = course_feedback_path(activity.course)
-      when "Poll"
-        title = "问卷&nbsp;" + activity.course_act.polls_name
-        url = poll_index_path(:polls_type => "Course", :polls_group_id => activity.course_id)
+    if activity.course_act
+      case activity.course_act_type
+        when "Course"
+          title = activity.course_act.name
+          url = course_path activity.course
+        when "HomeworkCommon"
+          title = "作业&nbsp;" + activity.course_act.name
+          url = student_work_index_path(:homework => activity.course_act.id)
+        when "News"
+          title = "通知公告&nbsp;" + activity.course_act.title
+          url = course_news_index_path(activity.course)
+        when "Attachment"
+          title = "课件&nbsp;" + activity.course_act.filename
+          url = course_files_path(activity.course)
+        when "Message"
+          title = "课程讨论区&nbsp;" + activity.course_act.subject
+          url = course_boards_path(activity.course,:parent_id => activity.course_act.parent_id ? activity.course_act.parent_id : activity.course_act.id, :topic_id => activity.course_act.id)
+        when "JournalsForMessage"
+          title = "留言&nbsp;" + activity.course_act.notes
+          url = course_feedback_path(activity.course)
+        when "Poll"
+          title = "问卷&nbsp;" + activity.course_act.polls_name
+          url = poll_index_path(:polls_type => "Course", :polls_group_id => activity.course_id)
+      end
     end
     link_to title.gsub(/<(?!img)[^>]*>/,'').html_safe, url, :class => "problem_tit c_dblue fl fb"
   end