Rack :: Session: error de cookies con Sinatra, Thin, Rails y Rack :: Cascade

Question

Tengo una aplicación combinada de Sinatra/Rails que comparte una sesión con Rack :: Session :: Cookie. La aplicación funciona bien cuando se inicia con rack :: :: Handler Thin.run aplicación, pero si el archivo rackup se inicia con inicio delgada, me sale un error en rack :: sesión :: Cookie:

!! Unexpected error while processing request: no marshal_dump is defined for class Proc 
no marshal_dump is defined for class Proc 
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/session/cookie.rb:64:in `dump' 
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/session/cookie.rb:64:in `commit_session' 
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/session/cookie.rb:38:in `call' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:76:in `block in pre_process' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:74:in `catch' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:74:in `pre_process' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:57:in `process' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:42:in `receive_data' 
/usr/local/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine' 
/usr/local/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/backends/base.rb:57:in `start' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/server.rb:156:in `start' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/controllers/controller.rb:80:in `start' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/runner.rb:177:in `run_command' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/runner.rb:143:in `run!' 
/usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/bin/thin:6:in `' 

El archivo rackup se parece a esto:

require ::File::dirname(__FILE__) + '/config/environment' 
require 'thin' 

app = Rack::Builder.new { 
    use Rails::Rack::Static 
    run Rack::Cascade.new([Sinatra::Application, ActionController::Dispatcher.new]) 
}.to_app 

use Rack::Session::Cookie, :key => '_example', :domain => 'example.org', 
    :secret => 'secret' 

# have to use this 
Rack::Handler::Thin.run app, :Port => 4000, :Host => "0.0.0.0" 
# want to use: run app 

Answer 1

Ha intentado algo como esto:

app = Rack::Builder.new { 
    use Rack::Session::Cookie, :key => '_example', :domain => 'example.org', :secret => 'secret' 
    use Rails::Rack::Static 
    run Rack::Cascade.new([Sinatra::Application, ActionController::Dispatcher.new]) 
}.to_app 

parece que yo Tu problema es que estás usando Rack :: Session :: Cookie fuera del app.