from __future__ import absolute_import from datetime import date import traceback from django.db import IntegrityError from django.test import TestCase, TransactionTestCase from .models import Person, ManualPrimaryKeyTest, Profile, Tag, Thing 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) class GetOrCreateTransactionTests(TransactionTestCase): def test_get_or_create_integrityerror(self): # Regression test for #15117. Requires a TransactionTestCase on # databases that delay integrity checks until the end of transactions, # otherwise the exception is never raised. try: Profile.objects.get_or_create(person=Person(id=1)) except IntegrityError: pass else: self.skipTest("This backend does not support integrity checks.") class GetOrCreateThroughManyToMany(TestCase): def test_get_get_or_create(self): tag = Tag.objects.create(text='foo') a_thing = Thing.objects.create(name='a') a_thing.tags.add(tag) obj, created = a_thing.tags.get_or_create(text='foo') self.assertFalse(created) self.assertEqual(obj.pk, tag.pk) def test_create_get_or_create(self): a_thing = Thing.objects.create(name='a') obj, created = a_thing.tags.get_or_create(text='foo') self.assertTrue(created) self.assertEqual(obj.text, 'foo') self.assertIn(obj, a_thing.tags.all()) def test_something(self): Tag.objects.create(text='foo') a_thing = Thing.objects.create(name='a') self.assertRaises(IntegrityError, a_thing.tags.get_or_create, text='foo')