DistroPropaganda/code/rails32/depot_v/app/models/line_item.rb

#---
# Excerpted from "Agile Web Development with Rails",
# published by The Pragmatic Bookshelf.
# Copyrights apply to this code. It may not be used to create training material,
# courses, books, articles, and the like. Contact us if you are in doubt.
# We make no guarantees that this code is fit for any purpose.
# Visit http://www.pragmaticprogrammer.com/titles/rails4 for more book information.
#---
class LineItem < ActiveRecord::Base
  belongs_to :order
  belongs_to :product
  belongs_to :cart
  attr_accessible :cart_id, :product_id

  def total_price
    product.price * quantity
  end
end