[Rails] Depot app from 'Agile Web Development with Rails'

[Mitko Kostov]

In the book 'Agile web development with Rails", the authors are building
a store-like app. At some point they add dynamic adding a product with
ajax call.

[code]
<!-- store_controller#index -->
<% form_remote_tag :url => { :action => 'add_to_cart', :id => product }
do %>
  <%= submit_tag "Add to Cart" %>
<% end %>
[/code]

[code]
# store_controller.rb
def add_to_cart
product = Product.find(params[:id])
@cart = find_cart
@current_item = @cart.add_product(product)

# render xhr request
[/code]

[code]
# model cart.rb / no DB table
def add_to_cart(product)
   current_item = @items.find {|item| item.product == product}
    if current_item
      current_item.increment_quantity
    else
      current_item = CartItem.new(product)
      @items << current_item
    end
    current_item
  end
[/code]

Is there a way to add a text field which will represent the quantity of
the product to add in the cart ? Customer enter quantity in text field,
click Add to cart and the product and quantity is added to the
model/cart.

Thanks in advance
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