DistroPropaganda/code/rails31/depot_s/app/models/order.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 Order < ActiveRecord::Base
  PAYMENT_TYPES = [ "Check", "Credit card", "Purchase order" ]
  has_many :line_items, dependent: :destroy
  # ...
  validates :name, :address, :email, presence: true
  validates :pay_type, inclusion: PAYMENT_TYPES
  def add_line_items_from_cart(cart)
    cart.line_items.each do |item|
      item.cart_id = nil
      line_items << item
    end
  end
end