old_contents: import factory
  import factory.fuzzy
  from . import models
  
  from taravel.orders.factories import OrderFactory
  
  
  class GuestFactory(factory.django.DjangoModelFactory):
      order = factory.SubFactory(OrderFactory)
      first_name = factory.Sequence(lambda n: 'first_name-%04d' % n)
      second_name = factory.Sequence(lambda n: 'first_name-%04d' % n)
      government_id = factory.fuzzy.FuzzyInteger(low=100, high=200)
      value = factory.LazyAttribute(lambda x: x.order.trip.base_price)
  
      class Meta:
          model = models.Guest
  
new_contents: import factory
  import factory.fuzzy
  from . import models
  
  from taravel.orders.factories import OrderFactory
  
  
  class GuestFactory(factory.django.DjangoModelFactory):
      order = factory.SubFactory(OrderFactory)
      first_name = factory.Sequence(lambda n: 'first_name-%04d' % n)
      second_name = factory.Sequence(lambda n: 'first_name-%04d' % n)
      government_id = factory.fuzzy.FuzzyInteger(low=100, high=200)
  
      class Meta:
          model = models.Guest
  
subject: Drop value from GuestFactory