Rails - Oct 2005 - some errors in working on rubyonrails

sir,
I am working on rubyonrails,I am getting some errors in that:
add_ to_cart method:
I have created files such as store.controller, in which I defined 3 methods
add_to_cart,display_cart,find_cart

mddels:product.rb,line_Items
In line _items I have created methd self.for_product(product),
in cart.rb file I have initialize the product.
databases:
1.products(holding product info)
2.Line_items(holding cart info)

In application cart I have created 2 models:
1.cart
2.line_item
class StoreController < ApplicationController
      def index
         @products = Product.salable_items
      end
  
      def add_to_cart
         product = Product.find(params[:id])
         @cart = find_cart
         @cart.add_product(product)
         redirect_to( :action => ''display_cart'')
      end
  
      private
      def find_cart
  session[ :cart] ||= Cart.new
      end 
  
      def display_cart
         @cart =find_cart
  @items =-ruxhHikAxTgpAR6TowUfPQ@public.gmane.org
    end
 end
In above code when I browse http://localhost:3000/store/display_cart
getting the action link to display_cart but it is not showing any info of
products
Plz help me out in solving this problem
 thanks,.
      


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