%= f.fields_for field_name, design_file do |f| %>
  
 > 
    <%= design_file.file_identifier %>
    <% if classes.include?('r_destroy') %>
        <%= f.hidden_field :id %>
        <%= f.hidden_field :file %>
        <%= f.hidden_field :to_destroy %>
      <%= t('Delete') %>
    <% end %>
    <% if classes.include?('r_edit') %>
      <%= t('Edit') %>
    <% end %>
  
<% end %>