import datetime from django.db import DJANGO_VERSION_PICKLE_KEY, models from django.utils.translation import gettext_lazy as _ def standalone_number(): return 1 class Numbers: @staticmethod def get_static_number(): return 2 class PreviousDjangoVersionQuerySet(models.QuerySet): def __getstate__(self): state = super().__getstate__() state[DJANGO_VERSION_PICKLE_KEY] = '1.0' return state class MissingDjangoVersionQuerySet(models.QuerySet): def __getstate__(self): state = super().__getstate__() del state[DJANGO_VERSION_PICKLE_KEY] return state class Group(models.Model): name = models.CharField(_('name'), max_length=100) objects = models.Manager() previous_django_version_objects = PreviousDjangoVersionQuerySet.as_manager() missing_django_version_objects = MissingDjangoVersionQuerySet.as_manager() class Event(models.Model): title = models.CharField(max_length=100) group = models.ForeignKey(Group, models.CASCADE) class Happening(models.Model): when = models.DateTimeField(blank=True, default=datetime.datetime.now) name = models.CharField(blank=True, max_length=100, default="test") number1 = models.IntegerField(blank=True, default=standalone_number) number2 = models.IntegerField(blank=True, default=Numbers.get_static_number) event = models.OneToOneField(Event, models.CASCADE, null=True) class Container: # To test pickling we need a class that isn't defined on module, but # is still available from app-cache. So, the Container class moves # SomeModel outside of module level class SomeModel(models.Model): somefield = models.IntegerField() class M2MModel(models.Model): groups = models.ManyToManyField(Group) class AbstractEvent(Event): class Meta: abstract = True ordering = ['title'] class MyEvent(AbstractEvent): pass class Edition(models.Model): event = models.ForeignKey('MyEvent', on_delete=models.CASCADE)