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from datetime import datetime
from time import sleep
from django.contrib.postgres.functions import TransactionNow
from . import PostgreSQLTestCase
from .models import NowTestModel
class TestTransactionNow(PostgreSQLTestCase):
def test_transaction_now(self):
"""
The test case puts everything under a transaction, so two models
updated with a short gap should have the same time.
"""
m1 = NowTestModel.objects.create()
m2 = NowTestModel.objects.create()
NowTestModel.objects.filter(id=m1.id).update(when=TransactionNow())
sleep(0.1)
NowTestModel.objects.filter(id=m2.id).update(when=TransactionNow())
m1.refresh_from_db()
m2.refresh_from_db()
self.assertIsInstance(m1.when, datetime)
self.assertEqual(m1.when, m2.when)
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