auths_controller.rb

class AuthsController < ApplicationController
  include AuthsHelper

  def helloauth
	flash[:error] = session[:hello]
	redirect_to root_path
  end
end

auths_helper.rb

module AuthsHelper
   def test
	session[:hello] = "HELLO"			
	redirect_to auth_hello_path
   end
end

locations_controller.rb

class LocationsController < ApplicationController
  before_filter :test, :only => [:hello]
  
  def hello
	  logger.debug "HELLO GOT EXECUTED"
	  redirect_to root_path
  end
end