var fileSpan = $('#attachments_<%= j params[:attachment_id] %>');
$('<input>', { type: 'hidden', name: 'attachments[<%= j params[:attachment_id] %>][token]' } ).val('<%= j @attachment.token %>').appendTo(fileSpan);
fileSpan.find('a.remove-upload')
  .attr({
    "data-remote": true,
    "data-method": 'delete',
    href: '<%= j attachment_path(@attachment, :attachment_id => params[:attachment_id], :format => 'js') %>'
  })
  .off('click');