dealing with layout file bug

app/views/admin/designs/_form.html.erb

@@ -18,9 +18,9 @@
 <p>
 <%= f.label "layout", t('admin.layout') %>
 <%  if @design.layout.blank? %>
-    <%= f.file_field :layout_file %>
+    <%= f.file_field :layout %>
   <% else%>
-    <%= File.basename (Design.all.last.layout.url)  %>
+    <%= File.basename (@design.layout.file.url)  %>
 <% end %> 
 </p>
 <p>