sinatra-in-rails3.rb

class SinatraApp < Sinatra::Base
  get '/' do
    'Hello from Sinatra'
  end
end

RailsApp::Application.routes.draw do |map|
  match '/applications/sinatra/*path' :to => proc { |env|
    #BTM - PATH_INFO contains the full path (e.g. '/applications/sinatra/...')
    #which we don't want to pass along to the sinatra app since we want
    #it ignorant of where we attach it in the Rails routing space
    env['PATH_INFO'] = env['action_dispatch.request.path_parameters'][:path]                    
    SinatraApp.call(env)     
  }
end