def test_ordering_retained(self):
""" Test that using improve_queryset_consistency still retains the ordering. """
b = TestModel.objects.create(name='B')
a = TestModel.objects.create(name='A')
c = TestModel.objects.create(name='C')
queryset = TestModel.objects.all().order_by('name')
# To be sure that we test a query which combines the Datastore result with our cache we
# include some inconsistent_db stuff here...
with inconsistent_db():
d = TestModel.objects.create(name='D')
queryset = improve_queryset_consistency(queryset)
self.assertEqual(list(queryset), [a, b, c, d])
def test_newly_created_objects_returned(self):
existing = TestModel.objects.create(name='existing')
queryset = TestModel.objects.all()
self.assertItemsEqual(queryset.all(), [existing])
# Add a new object with eventual consistency being slow
with inconsistent_db():
new = TestModel.objects.create(name='new')
# The new object should not yet be returned
self.assertItemsEqual(queryset.all(), [existing])
# But using our handy function it should be returned
consistent = improve_queryset_consistency(queryset)
self.assertItemsEqual(consistent.all(), [existing, new])
def test_deleted_objects_not_returned(self):
""" When an object is deleted, improve_queryset_consistency should ensure that it is not
returned.
"""
obj = TestModel.objects.create(name='A')
queryset = TestModel.objects.filter(name='A')
self.assertItemsEqual(queryset.all(), [obj])
with inconsistent_db():
obj.delete()
# The object no longer exists, but the inconsistent db will still return it
self.assertItemsEqual(queryset.all(), [obj])
# improve_queryset_consistency to the rescue!
consistent = improve_queryset_consistency(queryset)
self.assertEqual(consistent.count(), 0)
def test_newly_modified_objects_returned(self):
""" If an object which previously did not match the query is modified to now match it, then
improve_queryset_consistency should include it even when the DB hasn't caught up yet.
"""
obj = TestModel.objects.create(name='A')
queryset = TestModel.objects.filter(name='B')
self.assertEqual(queryset.all().count(), 0)
with inconsistent_db():
obj.name = 'B'
obj.save()
# The DB is inconsistent, so the queryset should still return nothing
self.assertEqual(queryset.all().count(), 0)
# But improve_queryset_consistency should include the object
consistent = improve_queryset_consistency(queryset)
self.assertEqual(consistent.all().count(), 1)