import datetime from django.db import models, DJANGO_VERSION_PICKLE_KEY from django.utils.translation import ugettext_lazy as _ from django.utils.version import get_major_version def standalone_number(): return 1 class Numbers(object): @staticmethod def get_static_number(): return 2 @classmethod def get_class_number(cls): return 3 def get_member_number(self): return 4 nn = Numbers() class PreviousDjangoVersionQuerySet(models.QuerySet): def __getstate__(self): state = super(PreviousDjangoVersionQuerySet, self).__getstate__() state[DJANGO_VERSION_PICKLE_KEY] = str(float(get_major_version()) - 0.1) # previous major version return state class MissingDjangoVersionQuerySet(models.QuerySet): def __getstate__(self): state = super(MissingDjangoVersionQuerySet, self).__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): group = models.ForeignKey(Group) class Happening(models.Model): when = models.DateTimeField(blank=True, default=datetime.datetime.now) name = models.CharField(blank=True, max_length=100, default=lambda: "test") number1 = models.IntegerField(blank=True, default=standalone_number) number2 = models.IntegerField(blank=True, default=Numbers.get_static_number) number3 = models.IntegerField(blank=True, default=Numbers.get_class_number) number4 = models.IntegerField(blank=True, default=nn.get_member_number) class Container(object): # 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)