[Rails] Wrong number of arguments?

[Ryan Ororie]

I'm going through a tutorial here and running into an error I'm not sure
how to fix..this is my first foire into sessions.

Trying to create a shopping cart for a store app. I'm getting this
error:

wrong number of arguments (1 for 0)

RAILS_ROOT: script/../config/..

Here is my cart_item.rb model:

class CartItem
  attr_reader :product, :quantity

  def initialize
    @product = product
    @quantity = 1
  end

  def increment_quantity
    @quantity += 1
  end

  def title
    @product.title
  end

  def price
    @product.price * @quantity
  end
end

And my cart.rb model:

class Cart
  attr_reader :items

  def initialize
    @items = []
  end

  def add_product(product)
    current_item = @items.find {|item| item.product == product}
    if current_item
      current_item.increment_quantity
    else
      @items << CartItem.new(product)
    end
  end
end

And my add_to_cart.rhtml view:

<h1>The shopping cart</h1>
<ul>
  <% for item in @cart.items %>
    <li><%= cart_item.quantity %> &times; <%= h(item.title) %></li>
  <% end %>
</ul>

When I first tried clicking the add to cart function for a product I got
an error that method 'product' was undefined but then I did rake
db:sessions:clear and now I am getting this wrong number of arguments
error - any ideas?

Thanks!
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