个人主页课程讨论区动态报错

app/views/users/_course_message.html.erb

@@ -11,14 +11,14 @@
                 <%= link_to activity.try(:author).try(:realname), user_path(activity.author_id), :class => "newsBlue mr15" %>
             <% end %>
             TO
-            <%= link_to activity.course.name.to_s+" | 课程讨论区", course_path(activity.course), :class => "newsBlue ml15 mr5", :style=>"word-break:break-all"%>
-            <%#= link_to activity.course.name.to_s+"(课程讨论区)", course_path(activity.course), :class => "newsBlue ml15 mr5", :style=>"word-break:break-all"%>
+            <%= link_to activity.board.course.name.to_s+" | 课程讨论区", course_path(activity.board.course), :class => "newsBlue ml15 mr5", :style=>"word-break:break-all"%>
+            <%#= link_to activity.course.name.to_s+"(课程讨论区)", course_path(activity.board.course), :class => "newsBlue ml15 mr5", :style=>"word-break:break-all"%>
           </div>
           <div class="homepagePostTitle mb12 break_word">
             <% if activity.parent_id.nil? %> <!--+"(帖子标题)"-->
-              <%= link_to activity.subject.to_s.html_safe, course_boards_path(activity.course,:parent_id =>activity.id, :topic_id => activity.id), :class=> "postGrey", :style=>"word-break:break-all" %>
+              <%= link_to activity.subject.to_s.html_safe, course_boards_path(activity.board.course,:parent_id =>activity.id, :topic_id => activity.id), :class=> "postGrey", :style=>"word-break:break-all" %>
             <% else %>
-                <%= link_to activity.parent.subject.to_s.html_safe, course_boards_path(activity.course,:parent_id =>activity.parent_id, :topic_id => activity.id), :class=> "postGrey", :style=>"word-break:break-all"%>
+                <%= link_to activity.parent.subject.to_s.html_safe, course_boards_path(activity.board.course,:parent_id =>activity.parent_id, :topic_id => activity.id), :class=> "postGrey", :style=>"word-break:break-all"%>
             <% end %>
           </div>
           <div class="homepagePostSubmitContainer">