facebook_session.rb

module FacebookSession
  module Session
    def self.included(base)
      base.class_eval do
        cattr_accessor :finding_current
        include Methods
      end
    end
    
    module Methods
      
      def validate_by_facebook_connect
        return if self.class.finding_current
        self.class.finding_current = true
        alt_session = self.class.find
        self.class.finding_current = false
        alt_record = alt_session && alt_session.record || nil
        if alt_record
          facebook_session = controller.facebook_session
          alt_record.send("#{facebook_uid_field}=", facebook_session.user.uid)
          alt_record.send("#{facebook_session_key_field}=", facebook_session.session_key)
          alt_record.before_connect(facebook_session) if alt_record.respond_to?(:before_connect)
          alt_record.save
          self.attempted_record = alt_record
        else
          super
        end
      end  
    end
    
  end
end

user_session.rb

require 'facebook_session'
class UserSession < Authlogic::Session::Base
  include FacebookSession::Session

end