解决上传文件名过长问题（作业中部分文件名超出边框）

app/views/attachments/_links.html.erb

@@ -7,9 +7,9 @@
   <% end%>
       <span title="<%= attachment.filename%>" id = "attachment_">
         <% if options[:length] %>
-          <%= link_to_attachment attachment, :class => 'icon icon-attachment', :download => true,:length => options[:length] -%>
+          <%= link_to_short_attachment attachment, :class => 'icon icon-attachment', :download => true,:length => options[:length] -%>
         <% else %>
-          <%= link_to_attachment attachment, :class => 'icon icon-attachment', :download => true -%>
+          <%= link_to_short_attachment attachment, :class => 'icon icon-attachment', :download => true -%>
         <% end %>
       </span>
   <%if is_float%>