个人留言的at回复报错

app/models/at_message.rb

@@ -89,7 +89,7 @@ class AtMessage < ActiveRecord::Base
             status = -1
           end
       when 'JournalsForMessage'
-        if at_message.jour && at_message.jour.course
+        if at_message.jour && defined? at_message.jour.course
           #作业回复
           shield_type = "Course"
           container_id = at_message.jour.course.id
@@ -99,7 +99,7 @@ class AtMessage < ActiveRecord::Base
         else
           type = "journal_for_message"
           detail_id = topic.id
-          detail_title = at_message.subject
+          detail_title = at_message.notes
         end
       else
         status = -1