145 lines
5.5 KiB
Python
145 lines
5.5 KiB
Python
from __future__ import unicode_literals
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import pickle
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import datetime
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import warnings
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from django.test import TestCase
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from django.utils.encoding import force_text
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from django.utils.version import get_major_version, get_version
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from .models import Group, Event, Happening, Container, M2MModel
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class PickleabilityTestCase(TestCase):
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def setUp(self):
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Happening.objects.create() # make sure the defaults are working (#20158)
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def assert_pickles(self, qs):
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self.assertEqual(list(pickle.loads(pickle.dumps(qs))), list(qs))
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def test_related_field(self):
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g = Group.objects.create(name="Ponies Who Own Maybachs")
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self.assert_pickles(Event.objects.filter(group=g.id))
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def test_datetime_callable_default_all(self):
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self.assert_pickles(Happening.objects.all())
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def test_datetime_callable_default_filter(self):
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self.assert_pickles(Happening.objects.filter(when=datetime.datetime.now()))
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def test_lambda_as_default(self):
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self.assert_pickles(Happening.objects.filter(name="test"))
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def test_standalone_method_as_default(self):
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self.assert_pickles(Happening.objects.filter(number1=1))
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def test_staticmethod_as_default(self):
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self.assert_pickles(Happening.objects.filter(number2=1))
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def test_classmethod_as_default(self):
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self.assert_pickles(Happening.objects.filter(number3=1))
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def test_membermethod_as_default(self):
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self.assert_pickles(Happening.objects.filter(number4=1))
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def test_doesnotexist_exception(self):
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# Ticket #17776
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original = Event.DoesNotExist("Doesn't exist")
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unpickled = pickle.loads(pickle.dumps(original))
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# Exceptions are not equal to equivalent instances of themselves, so
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# can't just use assertEqual(original, unpickled)
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self.assertEqual(original.__class__, unpickled.__class__)
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self.assertEqual(original.args, unpickled.args)
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def test_manager_pickle(self):
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pickle.loads(pickle.dumps(Happening.objects))
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def test_model_pickle(self):
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"""
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Test that a model not defined on module level is pickleable.
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"""
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original = Container.SomeModel(pk=1)
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dumped = pickle.dumps(original)
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reloaded = pickle.loads(dumped)
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self.assertEqual(original, reloaded)
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# Also, deferred dynamic model works
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Container.SomeModel.objects.create(somefield=1)
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original = Container.SomeModel.objects.defer('somefield')[0]
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dumped = pickle.dumps(original)
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reloaded = pickle.loads(dumped)
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self.assertEqual(original, reloaded)
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self.assertEqual(original.somefield, reloaded.somefield)
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def test_model_pickle_m2m(self):
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"""
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Test intentionally the automatically created through model.
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"""
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m1 = M2MModel.objects.create()
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g1 = Group.objects.create(name='foof')
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m1.groups.add(g1)
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m2m_through = M2MModel._meta.get_field('groups').rel.through
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original = m2m_through.objects.get()
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dumped = pickle.dumps(original)
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reloaded = pickle.loads(dumped)
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self.assertEqual(original, reloaded)
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def test_model_pickle_dynamic(self):
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class Meta:
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proxy = True
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dynclass = type(str("DynamicEventSubclass"), (Event, ),
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{'Meta': Meta, '__module__': Event.__module__})
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original = dynclass(pk=1)
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dumped = pickle.dumps(original)
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reloaded = pickle.loads(dumped)
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self.assertEqual(original, reloaded)
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self.assertIs(reloaded.__class__, dynclass)
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def test_specialized_queryset(self):
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self.assert_pickles(Happening.objects.values('name'))
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self.assert_pickles(Happening.objects.values('name').dates('when', 'year'))
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# ValuesQuerySet with related field (#14515)
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self.assert_pickles(
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Event.objects.select_related('group').order_by('title').values_list('title', 'group__name')
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)
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def test_pickle_prefetch_related_idempotence(self):
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g = Group.objects.create(name='foo')
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groups = Group.objects.prefetch_related('event_set')
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# First pickling
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groups = pickle.loads(pickle.dumps(groups))
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self.assertQuerysetEqual(groups, [g], lambda x: x)
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# Second pickling
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groups = pickle.loads(pickle.dumps(groups))
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self.assertQuerysetEqual(groups, [g], lambda x: x)
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def test_missing_django_version_unpickling(self):
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"""
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#21430 -- Verifies a warning is raised for querysets that are
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unpickled without a Django version
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"""
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qs = Group.missing_django_version_objects.all()
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with warnings.catch_warnings(record=True) as recorded:
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pickle.loads(pickle.dumps(qs))
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msg = force_text(recorded.pop().message)
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self.assertEqual(msg,
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"Pickled queryset instance's Django version is not specified.")
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def test_unsupported_unpickle(self):
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"""
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#21430 -- Verifies a warning is raised for querysets that are
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unpickled with a different Django version than the current
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"""
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qs = Group.previous_django_version_objects.all()
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with warnings.catch_warnings(record=True) as recorded:
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pickle.loads(pickle.dumps(qs))
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msg = force_text(recorded.pop().message)
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self.assertEqual(msg,
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"Pickled queryset instance's Django version %s does not "
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"match the current version %s."
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% (str(float(get_major_version()) - 0.1), get_version()))
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