application_controller.rb

# Filters added to this controller apply to all controllers in the application.
# Likewise, all the methods added will be available for all controllers.
class ApplicationController
  #helper :all
  #filter_parameter_logging :password
  #protect_from_forgery
  #helper_method :current_user_session, :current_user
  private
    def current_user_session
      return @current_user_session if defined?(@current_user_session)
      @current_user_session = Session.find
    end

    def current_user
      return @current_user if defined?(@current_user)
      @current_user = current_user_session && current_user_session.user
    end
end