Trying to save shopping cart line items to orders

app/controllers/store_controller.rb

@@ -5,6 +5,7 @@ def index
 
   def add_to_cart
   	product = Product.find(params[:id])
+    get_order
   	@cart = get_cart
   	@cart.add_line_item(product)
 
@@ -40,7 +41,8 @@ def checkout
     if @items.empty?
       redirect_to root_path("There's nothing in your cart")
     else
-      @order = Order.new
+      @cart.empty_cart_contents!
+      @order = @cart.get_order
     end
   end
 
@@ -50,6 +52,8 @@ def get_cart
   	session[:cart] ||= Cart.new
   end
 
-
+  def get_order
+    session[:order] ||= Order.new
+  end 
 
 end

app/models/cart.rb

@@ -10,6 +10,7 @@ def initialize
   	@items = []
   	@total_price = 0.0
   	@taxes = 0.0
+    @order = session[:order]
   end
 
 
@@ -21,7 +22,8 @@ def add_line_item(product)
   	if item 
   		item.quantity += 1
   	else
-  		item = Lineitem.add_product(product)
+  		item = Lineitem.add_product(product, @order)
+
   		@items << item
 
   	end
@@ -33,5 +35,7 @@ def empty_cart_contents!
     @items = []
     @total_price = 0.0
     @taxes = 0.0
+    @order = Order.new
   end
+
 end

app/models/lineitem.rb

@@ -5,8 +5,8 @@ class Lineitem < ActiveRecord::Base
 
   # # # # next feature, receiving quantity...
 
-  def self.add_product(product)
-  	item = self.new
+  def self.add_product(product, order)
+  	item = order.lineitems.build
   	item.quantity = 1
   	item.product = product
   	#record the price during the sale

app/views/store/checkout.html.erb

@@ -2,7 +2,7 @@
 
 	<%= render :partial => 'items_in_cart', :collection => @items, :as => 'item' %>
 
-	
+
 	<%= form_for [:admin, @order] do |f| %>
 		<section class="field">
 			<%= f.label :first_name %>

config/environment.rb

@@ -3,3 +3,4 @@
 
 # Initialize the rails application
 Elmorfstore::Application.initialize!
+config.action_controller.session_store = :active_record_store