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Fixed #30027 -- Errored out on Window function usage if unsupported.

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Simon Charette 2019-01-15 21:48:12 -06:00 • committed by Tim Graham
parent ebd2fe1861
commit 64d5bafbc6
2 changed files with 10 additions and 1 deletions
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8
tests/expressions_window/tests.py
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@ -1,5 +1,5 @@
import datetime
from unittest import skipIf, skipUnless
from unittest import mock, skipIf, skipUnless
from django.core.exceptions import FieldError
from django.db import NotSupportedError, connection
@ -821,6 +821,12 @@ class NonQueryWindowTests(SimpleTestCase):
with self.assertRaisesMessage(NotSupportedError, msg):
Employee.objects.annotate(dense_rank=Window(expression=DenseRank())).filter(dense_rank__gte=1)
def test_unsupported_backend(self):
msg = 'This backend does not support window expressions.'
with mock.patch.object(connection.features, 'supports_over_clause', False):
with self.assertRaisesMessage(NotSupportedError, msg):
Employee.objects.annotate(dense_rank=Window(expression=DenseRank())).get()
def test_invalid_order_by(self):
msg = 'order_by must be either an Expression or a sequence of expressions'
with self.assertRaisesMessage(ValueError, msg):