Ruby on Rails - Login Session with Edit
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I have two issues and can't figure out why! I have followed the tutorial of http://ruby.railstutorial.org/chapters/

    Problem #1: My login and logout don't seem to be working
    Problem #2: My private function doesn't see sign_in? -- I believe however is because sign_in? is declared in the sessionHelpers and I declared this function in the customerController which would explain why I can't see but don't know how to make it see.

Here the code I have!
model/customer.rb
controller/sessions

    class SessionsController < ApplicationController
      	def new
      	end
    
      	def create
      		customer = Customer.find_by_email(params[:session][:email])
      		if customer && customer.authenticate(params[:session][:password])
        			# Sign the user in and redirect to the user's show page.
    			sign_in customer
    			redirect_back_or customer
      		else
    			flash.now[:error] = 'Invalid email/password combination'
       	 		render 'new'
      		end
    		
      	end
    
      	def destroy
    		sign_out
    		redirect_to root_path
      	end
    end

controller/customers

    class CustomersController < ApplicationController
    	before_filter :signed_in_customer, only: [:edit, :update]
    	before_filter :correct_customer,   only: [:edit, :update]
    
    	def new
    		@customer = Customer.new
    	end
    
    	def create
    		@customer = Customer.new(params[:customer])
    		if @customer.save
    			sign_in @customer
    			flash[:success] = "Welcome to Where you Where"
    			redirect_to @customer
    		else
    			render 'new'
    		end
    	end
    
    	def show
    		@customer = Customer.find(params[:id])
    	end
    
    	def edit
    		@customer = Customer.find(params[:id])
    	end
    	
    	def update
    		@customer = Customer.find(params[:id])
    		if @customer.update_attributes(params[:customer])
    			flash[:success] = "Profile updated"
    			sign_in @customer
    			redirect_to @customer
    		else
    			render 'edit'
    		end
    	end
    
    	def index
    		@customers = Customer.all
    	end
    
    	private
    		def signed_in_customer
    			unless signed_in?
    				store_location
    				redirect_to signin_path, notice: "Please sign in."
    			end
    		end
    
        		def correct_customer
          			@customer = Customer.find(params[:id])
          			redirect_to(root_path) unless current_customer?(@customer)
        		end
    end

helpers/sessions

    module SessionsHelper
    	def sign_in(customer)
    		cookies.permanent[:remember_token] = customer.remember_token
    		self.current_customer = customer
    	end
    
    	def sign_in?
    		!current_customer.nil?
    	end
    
    	def current_customer=(customer)
    		@current_customer = customer
    	end
    
    	def current_customer?(customer)
    		customer = current_customer
    	end
    
    	def current_customer
    		@current_customer ||= Customer.find_by_remember_token(cookies[:remember_token])
    	end
    
    	def sign_out
    		self.current_customer = nil
    		cookies.delete(:remember_me)
    	end
    
      	def redirect_back_or(default)
        		redirect_to(session[:return_to] || default)
        		session.delete(:return_to)
      	end
    
      	def store_location
        		session[:return_to] = request.fullpath
      	end
    end

Thanks again, sorry for the misspell