It might also be helpful to see my store_controller.rb file:

class StoreController < ApplicationController

  def index
    @products = Product.find_products_for_sale
  end

  def add_to_cart
    @cart = find_cart
    product = Product.find(params[:id])
    @cart.add_product(product)
  end

  private
  def find_cart
    session[:cart] ||=Cart.new
  end
end

If I am reading the trace right (which I don't know that I am) I think 
the problem is on the @cart.add_product(product) line?
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