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Fixed #28926 -- Fixed loss of precision of big DurationField values on SQLite and MySQL.

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Sergey Fedoseev 2017-12-29 03:35:41 +05:00 • committed by Tim Graham
parent 46d1af2e82
commit ae6fa914aa
7 changed files with 47 additions and 7 deletions
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19
tests/expressions/tests.py
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@ -1250,6 +1250,16 @@ class FTimeDeltaTests(TestCase):
]
self.assertEqual(over_estimate, ['e4'])
@skipUnlessDBFeature('supports_temporal_subtraction')
def test_datetime_subtraction_microseconds(self):
delta = datetime.timedelta(microseconds=8999999999999999)
Experiment.objects.update(end=F('start') + delta)
qs = Experiment.objects.annotate(
delta=ExpressionWrapper(F('end') - F('start'), output_field=models.DurationField())
)
for e in qs:
self.assertEqual(e.delta, delta)
def test_duration_with_datetime(self):
# Exclude e1 which has very high precision so we can test this on all
# backends regardless of whether or not it supports
@ -1259,6 +1269,15 @@ class FTimeDeltaTests(TestCase):
).order_by('name')
self.assertQuerysetEqual(over_estimate, ['e3', 'e4', 'e5'], lambda e: e.name)
def test_duration_with_datetime_microseconds(self):
delta = datetime.timedelta(microseconds=8999999999999999)
qs = Experiment.objects.annotate(dt=ExpressionWrapper(
F('start') + delta,
output_field=models.DateTimeField(),
))
for e in qs:
self.assertEqual(e.dt, e.start + delta)
def test_date_minus_duration(self):
more_than_4_days = Experiment.objects.filter(
assigned__lt=F('completed') - Value(datetime.timedelta(days=4), output_field=models.DurationField())