Order Item Payment

order_item_payment.rb

class Order
  include DataMapper::Resource

  property :id, Serial, key: true
  property :status, Enum[:new, :ready, :paid, :shipped, :closed, :canceled]

  belongs_to :buyer, 'User'
  has n, :items
  has 1, :payment

  property :shipping_address_country, String
  property :shipping_address_city, String

  def shipping_address= address
    self.shipping_address_country = address.country
    self.shipping_address_city = address.city
  end

  def shipping_address
    Address.new(shipping_address_country, shipping_address_city)
  end


  def self.make buyer
    create buyer: buyer, shipping_address: buyer.address, status: :new
  end

  def self.get buyer, id
    #...
  end

  def self.all_orders buyer
    #...
  end

  def self.active_orders buyer
    #...
  end


  def make_item book, quantity
    ensure_status :new

    amount = book.price * quantity
    items.create book: book, quantity: quantity, amount: amount
  end

  def make_payment masked_card
    ensure_status :ready

    self.payment = Payment.new(masked_card: masked_card, amount: total_amount)
    self.status = :paid
    save
  end

  def mark_as_ready
    #...
  end

  def mark_as_shipped
    #...
  end

  def total_amount
    #...
  end

  private

  def ensure_status required_status
    raise InvalidOrderStatus.new(self) if status != required_status
  end
end

class Item
  include DataMapper::Resource

  property :id, Serial
  belongs_to :book

  property :quantity, Integer
  property :amount, Decimal
end

class Payment
  include DataMapper::Resource

  property :id, Serial
  property :masked_card, String
  property :amount, Decimal

  property :created_at, DateTime
  property :updated_at, DateTime
end