from __future__ import unicode_literals import pickle import datetime from django.test import TestCase from .models import Group, Event, Happening, Container, M2MModel class PickleabilityTestCase(TestCase): def setUp(self): Happening.objects.create() # make sure the defaults are working (#20158) def assert_pickles(self, qs): self.assertEqual(list(pickle.loads(pickle.dumps(qs))), list(qs)) def test_related_field(self): g = Group.objects.create(name="Ponies Who Own Maybachs") self.assert_pickles(Event.objects.filter(group=g.id)) def test_datetime_callable_default_all(self): self.assert_pickles(Happening.objects.all()) def test_datetime_callable_default_filter(self): self.assert_pickles(Happening.objects.filter(when=datetime.datetime.now())) def test_lambda_as_default(self): self.assert_pickles(Happening.objects.filter(name="test")) def test_standalone_method_as_default(self): self.assert_pickles(Happening.objects.filter(number1=1)) def test_staticmethod_as_default(self): self.assert_pickles(Happening.objects.filter(number2=1)) def test_classmethod_as_default(self): self.assert_pickles(Happening.objects.filter(number3=1)) def test_membermethod_as_default(self): self.assert_pickles(Happening.objects.filter(number4=1)) def test_doesnotexist_exception(self): # Ticket #17776 original = Event.DoesNotExist("Doesn't exist") unpickled = pickle.loads(pickle.dumps(original)) # Exceptions are not equal to equivalent instances of themselves, so # can't just use assertEqual(original, unpickled) self.assertEqual(original.__class__, unpickled.__class__) self.assertEqual(original.args, unpickled.args) def test_model_pickle(self): """ Test that a model not defined on module level is pickleable. """ original = Container.SomeModel(pk=1) dumped = pickle.dumps(original) reloaded = pickle.loads(dumped) self.assertEqual(original, reloaded) # Also, deferred dynamic model works Container.SomeModel.objects.create(somefield=1) original = Container.SomeModel.objects.defer('somefield')[0] dumped = pickle.dumps(original) reloaded = pickle.loads(dumped) self.assertEqual(original, reloaded) self.assertEqual(original.somefield, reloaded.somefield) def test_model_pickle_m2m(self): """ Test intentionally the automatically created through model. """ m1 = M2MModel.objects.create() g1 = Group.objects.create(name='foof') m1.groups.add(g1) m2m_through = M2MModel._meta.get_field_by_name('groups')[0].rel.through original = m2m_through.objects.get() dumped = pickle.dumps(original) reloaded = pickle.loads(dumped) self.assertEqual(original, reloaded) def test_model_pickle_dynamic(self): class Meta: proxy = True dynclass = type(str("DynamicEventSubclass"), (Event, ), {'Meta': Meta, '__module__': Event.__module__}) original = dynclass(pk=1) dumped = pickle.dumps(original) reloaded = pickle.loads(dumped) self.assertEqual(original, reloaded) self.assertIs(reloaded.__class__, dynclass) def test_specialized_queryset(self): self.assert_pickles(Happening.objects.values('name')) self.assert_pickles(Happening.objects.values('name').dates('when', 'year')) def test_pickle_prefetch_related_idempotence(self): g = Group.objects.create(name='foo') groups = Group.objects.prefetch_related('event_set') # First pickling groups = pickle.loads(pickle.dumps(groups)) self.assertQuerysetEqual(groups, [g], lambda x: x) # Second pickling groups = pickle.loads(pickle.dumps(groups)) self.assertQuerysetEqual(groups, [g], lambda x: x)