FactoryGirl.define do
  factory :my_factory do
    cost_per_driving_hour 10
    cost_per_cultivation_hour 50

    after(:create) do |instance, evaluator|
      instance.cost_per_driving_hour = evaluator.cost_per_driving_hour
      instance.cost_per_cultivation_hour = evaluator.cost_per_cultivation_hour

      instance.save
    end
  end
end