修复课程实践上传附件人悬浮框显示不正确的问题

app/views/attachments/_links.html.erb

@@ -33,7 +33,7 @@
   	<% end %>
   <% end %>
   <% if options[:author] %>
-    <span class="author" title="attachment.author">
+    <span class="author" title="<%= attachment.author%>">
       <%= link_to h(truncate(attachment.author.name, length: 10, omission: '...')),user_path(attachment.author) %>,
       <%= format_time(attachment.created_on) %>
     </span>