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from __future__ import absolute_import
from datetime import date
import traceback
from django.db import IntegrityError
from django.test import TestCase
from .models import Person, ManualPrimaryKeyTest
class GetOrCreateTests(TestCase):
def test_get_or_create(self):
p = Person.objects.create(
first_name='John', last_name='Lennon', birthday=date(1940, 10, 9)
)
p, created = Person.objects.get_or_create(
first_name="John", last_name="Lennon", defaults={
"birthday": date(1940, 10, 9)
}
)
self.assertFalse(created)
self.assertEqual(Person.objects.count(), 1)
p, created = Person.objects.get_or_create(
first_name='George', last_name='Harrison', defaults={
'birthday': date(1943, 2, 25)
}
)
self.assertTrue(created)
self.assertEqual(Person.objects.count(), 2)
# If we execute the exact same statement, it won't create a Person.
p, created = Person.objects.get_or_create(
first_name='George', last_name='Harrison', defaults={
'birthday': date(1943, 2, 25)
}
)
self.assertFalse(created)
self.assertEqual(Person.objects.count(), 2)
# If you don't specify a value or default value for all required
# fields, you will get an error.
self.assertRaises(IntegrityError,
Person.objects.get_or_create, first_name="Tom", last_name="Smith"
)
# If you specify an existing primary key, but different other fields,
# then you will get an error and data will not be updated.
m = ManualPrimaryKeyTest.objects.create(id=1, data="Original")
self.assertRaises(IntegrityError,
ManualPrimaryKeyTest.objects.get_or_create, id=1, data="Different"
)
self.assertEqual(ManualPrimaryKeyTest.objects.get(id=1).data, "Original")
# get_or_create should raise IntegrityErrors with the full traceback.
# This is tested by checking that a known method call is in the traceback.
# We cannot use assertRaises/assertRaises here because we need to inspect
# the actual traceback. Refs #16340.
try:
ManualPrimaryKeyTest.objects.get_or_create(id=1, data="Different")
except IntegrityError as e:
formatted_traceback = traceback.format_exc()
self.assertIn('obj.save', formatted_traceback)
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