app/models/order.rb

order.rb

class Order < ActiveRecord::Base
  
  belongs_to :user
  has_many :items, :class_name => "OrderItem", :dependent => :destroy
  has_one :info, :class_name => "OrderInfo", :dependent => :destroy

  accepts_nested_attributes_for :info


  def build_item_cache_from_cart(cart)
    cart.items.each do |cart_item|
      item = items.build
      item.product_name = cart_item.title
      item.quantity = 1
      item.price = cart_item.price
      item.save
    end
  end

end