use rack gridfs

config/routes.rb

@@ -6,6 +6,7 @@ Orbit::Application.routes.draw do
   end
 
   mount Resque::Server, :at => "/admin/resque"
+  mount Rack::GridFS::Endpoint.new(:db => Mongoid.database,:lookup=>:path), :at => "gridfs"
 
   # routes for sinatra app
   match '/site/set_registered', :to => CentralServerExchangeApp