Access Rails 3 Session from Rack?

Question

I was able to do the following in Rails 2.3.5 to access attributes that I set on the session from within my Rails app. Now in Rails 3, env["rack.session"] is nil. How do I do the same thing in Rails 3?

class CallbackFilter
  def initialize(app)
    @app = app
  end

  def call(env)
    unless env["rack.session"][:oauth_callback_method].blank?
      env["REQUEST_METHOD"] = env["rack.session"].delete(:oauth_callback_method).to_s.upcase
    end
    @app.call(env)
  end
end

Answer 1

It was because I placed the use CallbackFilter in config.ru. It should be placed in config/application.rb like so:

config.middleware.use CallbackFilter

Otherwise the environments didn't look like they were in sync...

Answer 2

There's another 'dirty' way to syncronize(for those who can't integrate rack app in rails for some reasons).

You should set :key and :secret to same values in both Rails and Rack.

In rails :secret assigned as ChatApp::Application.config.secret_token and usually configured in initializers/secret_token.rb , and in session_store.rb there's is a :key option for YourApp::Application.config.session_store). So in the end it will be something like:

in Rack::Builder.new block:

use Rack::Session::Cookie, :key => '_your_app_session',
                               :path => '/',
                               :secret => 'secret_more_than_30_dig'

initializers/session_store.rb

YourApp::Application.config.session_store :cookie_store, :key => '_your_app_session',
                                                          :path => '/'

initializers/secret_token.rb

YourApp::Application.config.secret_token = 'secret_more_than_30_dig'

now you should be able to access it throw request.env['rack.session']