old_contents: # Generated by Django 3.0.6 on 2020-06-05 14:35
  
  from django.db import migrations
  
  from ..utils import get_countries_without_shipping_zone
  
  
  def assign_countries_in_default_shipping_zone(apps, schema_editor):
      ShippingZone = apps.get_model("shipping", "ShippingZone")
      qs = ShippingZone.objects.filter(default=True)
      if qs.exists():
          default_zone = qs[0]
          if not default_zone.countries:
              default_zone.countries = get_countries_without_shipping_zone()
              default_zone.save(update_fields=["countries"])
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ("shipping", "0017_django_price_2"),
      ]
  
      operations = [
          migrations.RunPython(
              assign_countries_in_default_shipping_zone, migrations.RunPython.noop
          )
      ]
  
new_contents: # Generated by Django 3.0.6 on 2020-06-05 14:35
  
  from django.db import migrations
  from django_countries import countries
  
  
  def get_countries_without_shipping_zone(ShippingZone):
      """Return countries that are not assigned to any shipping zone."""
      covered_countries = set()
      for zone in ShippingZone.objects.all():
          covered_countries.update({c.code for c in zone.countries})
      return (country[0] for country in countries if country[0] not in covered_countries)
  
  
  def assign_countries_in_default_shipping_zone(apps, schema_editor):
      ShippingZone = apps.get_model("shipping", "ShippingZone")
      qs = ShippingZone.objects.filter(default=True)
      if qs.exists():
          default_zone = qs[0]
          if not default_zone.countries:
              default_zone.countries = get_countries_without_shipping_zone(ShippingZone)
              default_zone.save(update_fields=["countries"])
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ("shipping", "0017_django_price_2"),
      ]
  
      operations = [
          migrations.RunPython(
              assign_countries_in_default_shipping_zone, migrations.RunPython.noop
          )
      ]
  
subject: Move utility function to migration