Facebook comment callback (_method fix)

fb-comments.rb

# app_helper
  def callback_attribute
    %{ callbackurl="#{url_for(request.path) + "?_method=GET&" + request.query_string}" }
  end

# in the view
<fb:comments xid="m_story_<%= @first.id %>_comments" canpost="true" candelete="false" showform="true" numposts="5" publish_feed="false" simple="true" reverse="true" returnurl="<%= link_to_app "item/#{@first.id}" %>" <%= callback_attribute %>>
  <fb:title> <%= @first.couple_name %></fb:title>
</fb:comments>

This assumes the newer flavor of url_for that supports optional leading slashes (sails 1.0, I believe).