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217 lines
8.2 KiB
Python
217 lines
8.2 KiB
Python
import datetime
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import pickle
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from django.db import models
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from django.test import TestCase
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from django.utils.version import get_version
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from .models import Container, Event, Group, Happening, 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_string_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_filter_reverse_fk(self):
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self.assert_pickles(Group.objects.filter(event=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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A model not defined on module level is picklable.
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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').remote_field.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("DynamicEventSubclass", (Event, ), {'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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# 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.assertSequenceEqual(groups, [g])
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# Second pickling
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groups = pickle.loads(pickle.dumps(groups))
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self.assertSequenceEqual(groups, [g])
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def test_pickle_prefetch_queryset_usable_outside_of_prefetch(self):
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# Prefetch shouldn't affect the fetch-on-pickle behavior of the
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# queryset passed to it.
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Group.objects.create(name='foo')
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events = Event.objects.order_by('id')
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Group.objects.prefetch_related(models.Prefetch('event_set', queryset=events))
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with self.assertNumQueries(1):
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events2 = pickle.loads(pickle.dumps(events))
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with self.assertNumQueries(0):
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list(events2)
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def test_pickle_prefetch_queryset_still_usable(self):
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g = Group.objects.create(name='foo')
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groups = Group.objects.prefetch_related(
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models.Prefetch('event_set', queryset=Event.objects.order_by('id'))
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)
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groups2 = pickle.loads(pickle.dumps(groups))
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self.assertSequenceEqual(groups2.filter(id__gte=0), [g])
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def test_pickle_prefetch_queryset_not_evaluated(self):
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Group.objects.create(name='foo')
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groups = Group.objects.prefetch_related(
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models.Prefetch('event_set', queryset=Event.objects.order_by('id'))
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)
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list(groups) # evaluate QuerySet
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with self.assertNumQueries(0):
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pickle.loads(pickle.dumps(groups))
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def test_pickle_prefetch_related_with_m2m_and_objects_deletion(self):
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"""
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#24831 -- Cached properties on ManyToOneRel created in QuerySet.delete()
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caused subsequent QuerySet pickling to fail.
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"""
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g = Group.objects.create(name='foo')
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m2m = M2MModel.objects.create()
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m2m.groups.add(g)
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Group.objects.all().delete()
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m2ms = M2MModel.objects.prefetch_related('groups')
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m2ms = pickle.loads(pickle.dumps(m2ms))
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self.assertSequenceEqual(m2ms, [m2m])
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def test_annotation_with_callable_default(self):
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# Happening.when has a callable default of datetime.datetime.now.
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qs = Happening.objects.annotate(latest_time=models.Max('when'))
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self.assert_pickles(qs)
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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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msg = "Pickled queryset instance's Django version is not specified."
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with self.assertRaisesMessage(RuntimeWarning, msg):
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pickle.loads(pickle.dumps(qs))
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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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msg = "Pickled queryset instance's Django version 1.0 does not match the current version %s." % get_version()
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with self.assertRaisesMessage(RuntimeWarning, msg):
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pickle.loads(pickle.dumps(qs))
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class InLookupTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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for i in range(1, 3):
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group = Group.objects.create(name='Group {}'.format(i))
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cls.e1 = Event.objects.create(title='Event 1', group=group)
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def test_in_lookup_queryset_evaluation(self):
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"""
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Neither pickling nor unpickling a QuerySet.query with an __in=inner_qs
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lookup should evaluate inner_qs.
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"""
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events = Event.objects.filter(group__in=Group.objects.all())
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with self.assertNumQueries(0):
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dumped = pickle.dumps(events.query)
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with self.assertNumQueries(0):
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reloaded = pickle.loads(dumped)
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reloaded_events = Event.objects.none()
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reloaded_events.query = reloaded
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self.assertSequenceEqual(reloaded_events, [self.e1])
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def test_in_lookup_query_evaluation(self):
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events = Event.objects.filter(group__in=Group.objects.values('id').query)
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with self.assertNumQueries(0):
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dumped = pickle.dumps(events.query)
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with self.assertNumQueries(0):
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reloaded = pickle.loads(dumped)
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reloaded_events = Event.objects.none()
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reloaded_events.query = reloaded
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self.assertSequenceEqual(reloaded_events, [self.e1])
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