Render component from other rails app in current rails app..

You can try this helper; (put in application_helper.rb, use by view)
it make an ajax call from given url.

def render_remote(url, view = 'remote')
      options = {}
      options[:update] = view
      options[:url] = url
      options[:method] = :get
      render :inline => %{<span id="#{view}"><p>Loading...</p><script
type="text/javascript"
language="JavaScript">#{remote_function(options)}</script></span>}
end

Regards,
herngwah