SRP snippet 3

gistfile1.rb

class Game < ActiveRecord::Base
  belongs_to :category
  validates_presence_of :title, :category_id, :description,
                        :price, :platform, :year

  def price
    price = read_attribute(:price)
    unless price.present?
      update_attribute(:price, GamePriceService.new(self).get_price)
      read_attribute(:price)
    end
  end
end