<%= f.fields_for field_name, design_file do |f| %>
  <li class="<%= classes %>" <%="path='#{design_file.file.url}' filename='#{design_file.file_identifier}'" %> > 
    <%= design_file.file_identifier %>
    <% if classes.include?('r_destroy') %>
        <%= f.hidden_field :id %>
        <%= f.hidden_field :file %>
        <%= f.hidden_field :to_destroy %>
      <a class="remove_mark" href="#"><%= t('Delete') %></a>
    <% end %>
    <% if classes.include?('r_edit') %>
      <a class="edit_mark" href="#"><%= t('Edit') %></a>
    <% end %>
  </li>
<% end %>