487 lines
18 KiB
Python
487 lines
18 KiB
Python
from __future__ import unicode_literals
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import time
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import traceback
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from datetime import date, datetime, timedelta
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from threading import Thread
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from django.db import DatabaseError, IntegrityError, connection
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from django.test import (
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TestCase, TransactionTestCase, ignore_warnings, skipUnlessDBFeature,
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)
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from django.utils.encoding import DjangoUnicodeDecodeError
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from .models import (
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Author, Book, DefaultPerson, ManualPrimaryKeyTest, Person, Profile,
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Publisher, Tag, Thing,
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)
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class GetOrCreateTests(TestCase):
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def setUp(self):
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self.lennon = Person.objects.create(
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first_name='John', last_name='Lennon', birthday=date(1940, 10, 9)
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)
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def test_get_or_create_method_with_get(self):
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created = Person.objects.get_or_create(
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first_name="John", last_name="Lennon", defaults={
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"birthday": date(1940, 10, 9)
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}
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)[1]
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self.assertFalse(created)
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self.assertEqual(Person.objects.count(), 1)
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def test_get_or_create_method_with_create(self):
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created = Person.objects.get_or_create(
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first_name='George', last_name='Harrison', defaults={
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'birthday': date(1943, 2, 25)
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}
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)[1]
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self.assertTrue(created)
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self.assertEqual(Person.objects.count(), 2)
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def test_get_or_create_redundant_instance(self):
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"""
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If we execute the exact same statement twice, the second time,
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it won't create a Person.
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"""
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Person.objects.get_or_create(
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first_name='George', last_name='Harrison', defaults={
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'birthday': date(1943, 2, 25)
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}
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)
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created = Person.objects.get_or_create(
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first_name='George', last_name='Harrison', defaults={
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'birthday': date(1943, 2, 25)
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}
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)[1]
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self.assertFalse(created)
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self.assertEqual(Person.objects.count(), 2)
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def test_get_or_create_invalid_params(self):
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"""
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If you don't specify a value or default value for all required
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fields, you will get an error.
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"""
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with self.assertRaises(IntegrityError):
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Person.objects.get_or_create(first_name="Tom", last_name="Smith")
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def test_get_or_create_on_related_manager(self):
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p = Publisher.objects.create(name="Acme Publishing")
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# Create a book through the publisher.
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book, created = p.books.get_or_create(name="The Book of Ed & Fred")
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self.assertTrue(created)
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# The publisher should have one book.
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self.assertEqual(p.books.count(), 1)
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# Try get_or_create again, this time nothing should be created.
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book, created = p.books.get_or_create(name="The Book of Ed & Fred")
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self.assertFalse(created)
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# And the publisher should still have one book.
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self.assertEqual(p.books.count(), 1)
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# Add an author to the book.
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ed, created = book.authors.get_or_create(name="Ed")
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self.assertTrue(created)
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# The book should have one author.
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self.assertEqual(book.authors.count(), 1)
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# Try get_or_create again, this time nothing should be created.
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ed, created = book.authors.get_or_create(name="Ed")
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self.assertFalse(created)
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# And the book should still have one author.
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self.assertEqual(book.authors.count(), 1)
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# Add a second author to the book.
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fred, created = book.authors.get_or_create(name="Fred")
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self.assertTrue(created)
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# The book should have two authors now.
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self.assertEqual(book.authors.count(), 2)
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# Create an Author not tied to any books.
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Author.objects.create(name="Ted")
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# There should be three Authors in total. The book object should have two.
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self.assertEqual(Author.objects.count(), 3)
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self.assertEqual(book.authors.count(), 2)
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# Try creating a book through an author.
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_, created = ed.books.get_or_create(name="Ed's Recipes", publisher=p)
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self.assertTrue(created)
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# Now Ed has two Books, Fred just one.
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self.assertEqual(ed.books.count(), 2)
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self.assertEqual(fred.books.count(), 1)
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# Use the publisher's primary key value instead of a model instance.
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_, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id)
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self.assertTrue(created)
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# Try get_or_create again, this time nothing should be created.
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_, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id)
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self.assertFalse(created)
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# The publisher should have three books.
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self.assertEqual(p.books.count(), 3)
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def test_defaults_exact(self):
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"""
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If you have a field named defaults and want to use it as an exact
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lookup, you need to use 'defaults__exact'.
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"""
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obj, created = Person.objects.get_or_create(
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first_name='George', last_name='Harrison', defaults__exact='testing', defaults={
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'birthday': date(1943, 2, 25),
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'defaults': 'testing',
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}
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)
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self.assertTrue(created)
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self.assertEqual(obj.defaults, 'testing')
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obj2, created = Person.objects.get_or_create(
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first_name='George', last_name='Harrison', defaults__exact='testing', defaults={
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'birthday': date(1943, 2, 25),
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'defaults': 'testing',
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}
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)
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self.assertFalse(created)
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self.assertEqual(obj, obj2)
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def test_callable_defaults(self):
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"""
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Callables in `defaults` are evaluated if the instance is created.
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"""
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obj, created = Person.objects.get_or_create(
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first_name="George",
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defaults={"last_name": "Harrison", "birthday": lambda: date(1943, 2, 25)},
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)
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self.assertTrue(created)
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self.assertEqual(date(1943, 2, 25), obj.birthday)
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def test_callable_defaults_not_called(self):
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def raise_exception():
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raise AssertionError
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obj, created = Person.objects.get_or_create(
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first_name="John", last_name="Lennon",
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defaults={"birthday": lambda: raise_exception()},
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)
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class GetOrCreateTestsWithManualPKs(TestCase):
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def setUp(self):
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self.first_pk = ManualPrimaryKeyTest.objects.create(id=1, data="Original")
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def test_create_with_duplicate_primary_key(self):
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"""
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If you specify an existing primary key, but different other fields,
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then you will get an error and data will not be updated.
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"""
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with self.assertRaises(IntegrityError):
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ManualPrimaryKeyTest.objects.get_or_create(id=1, data="Different")
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self.assertEqual(ManualPrimaryKeyTest.objects.get(id=1).data, "Original")
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def test_get_or_create_raises_IntegrityError_plus_traceback(self):
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"""
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get_or_create should raise IntegrityErrors with the full traceback.
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This is tested by checking that a known method call is in the traceback.
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We cannot use assertRaises here because we need to inspect
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the actual traceback. Refs #16340.
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"""
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try:
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ManualPrimaryKeyTest.objects.get_or_create(id=1, data="Different")
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except IntegrityError:
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formatted_traceback = traceback.format_exc()
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self.assertIn(str('obj.save'), formatted_traceback)
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# MySQL emits a warning when broken data is saved
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@ignore_warnings(module='django.db.backends.mysql.base')
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def test_savepoint_rollback(self):
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"""
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Regression test for #20463: the database connection should still be
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usable after a DataError or ProgrammingError in .get_or_create().
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"""
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try:
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Person.objects.get_or_create(
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birthday=date(1970, 1, 1),
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defaults={'first_name': b"\xff", 'last_name': b"\xff"})
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except (DatabaseError, DjangoUnicodeDecodeError):
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Person.objects.create(
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first_name="Bob", last_name="Ross", birthday=date(1950, 1, 1))
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else:
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self.skipTest("This backend accepts broken utf-8.")
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def test_get_or_create_empty(self):
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"""
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If all the attributes on a model have defaults, get_or_create() doesn't
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require any arguments.
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"""
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DefaultPerson.objects.get_or_create()
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class GetOrCreateTransactionTests(TransactionTestCase):
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available_apps = ['get_or_create']
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def test_get_or_create_integrityerror(self):
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"""
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Regression test for #15117. Requires a TransactionTestCase on
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databases that delay integrity checks until the end of transactions,
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otherwise the exception is never raised.
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"""
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try:
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Profile.objects.get_or_create(person=Person(id=1))
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except IntegrityError:
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pass
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else:
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self.skipTest("This backend does not support integrity checks.")
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class GetOrCreateThroughManyToMany(TestCase):
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def test_get_get_or_create(self):
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tag = Tag.objects.create(text='foo')
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a_thing = Thing.objects.create(name='a')
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a_thing.tags.add(tag)
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obj, created = a_thing.tags.get_or_create(text='foo')
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self.assertFalse(created)
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self.assertEqual(obj.pk, tag.pk)
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def test_create_get_or_create(self):
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a_thing = Thing.objects.create(name='a')
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obj, created = a_thing.tags.get_or_create(text='foo')
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self.assertTrue(created)
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self.assertEqual(obj.text, 'foo')
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self.assertIn(obj, a_thing.tags.all())
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def test_something(self):
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Tag.objects.create(text='foo')
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a_thing = Thing.objects.create(name='a')
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with self.assertRaises(IntegrityError):
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a_thing.tags.get_or_create(text='foo')
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class UpdateOrCreateTests(TestCase):
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def test_update(self):
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Person.objects.create(
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first_name='John', last_name='Lennon', birthday=date(1940, 10, 9)
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)
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p, created = Person.objects.update_or_create(
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first_name='John', last_name='Lennon', defaults={
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'birthday': date(1940, 10, 10)
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}
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)
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self.assertFalse(created)
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self.assertEqual(p.first_name, 'John')
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self.assertEqual(p.last_name, 'Lennon')
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self.assertEqual(p.birthday, date(1940, 10, 10))
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def test_create(self):
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p, created = Person.objects.update_or_create(
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first_name='John', last_name='Lennon', defaults={
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'birthday': date(1940, 10, 10)
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}
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)
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self.assertTrue(created)
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self.assertEqual(p.first_name, 'John')
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self.assertEqual(p.last_name, 'Lennon')
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self.assertEqual(p.birthday, date(1940, 10, 10))
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def test_create_twice(self):
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params = {
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'first_name': 'John',
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'last_name': 'Lennon',
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'birthday': date(1940, 10, 10),
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}
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Person.objects.update_or_create(**params)
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# If we execute the exact same statement, it won't create a Person.
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p, created = Person.objects.update_or_create(**params)
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self.assertFalse(created)
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def test_integrity(self):
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"""
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If you don't specify a value or default value for all required
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fields, you will get an error.
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"""
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with self.assertRaises(IntegrityError):
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Person.objects.update_or_create(first_name="Tom", last_name="Smith")
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def test_manual_primary_key_test(self):
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"""
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If you specify an existing primary key, but different other fields,
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then you will get an error and data will not be updated.
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"""
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ManualPrimaryKeyTest.objects.create(id=1, data="Original")
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with self.assertRaises(IntegrityError):
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ManualPrimaryKeyTest.objects.update_or_create(id=1, data="Different")
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self.assertEqual(ManualPrimaryKeyTest.objects.get(id=1).data, "Original")
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def test_error_contains_full_traceback(self):
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"""
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update_or_create should raise IntegrityErrors with the full traceback.
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This is tested by checking that a known method call is in the traceback.
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We cannot use assertRaises/assertRaises here because we need to inspect
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the actual traceback. Refs #16340.
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"""
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try:
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ManualPrimaryKeyTest.objects.update_or_create(id=1, data="Different")
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except IntegrityError:
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formatted_traceback = traceback.format_exc()
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self.assertIn('obj.save', formatted_traceback)
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def test_create_with_related_manager(self):
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"""
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Should be able to use update_or_create from the related manager to
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create a book. Refs #23611.
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"""
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p = Publisher.objects.create(name="Acme Publishing")
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book, created = p.books.update_or_create(name="The Book of Ed & Fred")
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self.assertTrue(created)
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self.assertEqual(p.books.count(), 1)
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def test_update_with_related_manager(self):
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"""
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Should be able to use update_or_create from the related manager to
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update a book. Refs #23611.
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"""
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p = Publisher.objects.create(name="Acme Publishing")
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book = Book.objects.create(name="The Book of Ed & Fred", publisher=p)
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self.assertEqual(p.books.count(), 1)
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name = "The Book of Django"
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book, created = p.books.update_or_create(defaults={'name': name}, id=book.id)
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self.assertFalse(created)
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self.assertEqual(book.name, name)
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self.assertEqual(p.books.count(), 1)
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def test_create_with_many(self):
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"""
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Should be able to use update_or_create from the m2m related manager to
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create a book. Refs #23611.
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"""
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p = Publisher.objects.create(name="Acme Publishing")
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author = Author.objects.create(name="Ted")
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book, created = author.books.update_or_create(name="The Book of Ed & Fred", publisher=p)
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self.assertTrue(created)
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self.assertEqual(author.books.count(), 1)
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def test_update_with_many(self):
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"""
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Should be able to use update_or_create from the m2m related manager to
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update a book. Refs #23611.
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"""
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p = Publisher.objects.create(name="Acme Publishing")
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author = Author.objects.create(name="Ted")
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book = Book.objects.create(name="The Book of Ed & Fred", publisher=p)
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book.authors.add(author)
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self.assertEqual(author.books.count(), 1)
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name = "The Book of Django"
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book, created = author.books.update_or_create(defaults={'name': name}, id=book.id)
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self.assertFalse(created)
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self.assertEqual(book.name, name)
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self.assertEqual(author.books.count(), 1)
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def test_defaults_exact(self):
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"""
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If you have a field named defaults and want to use it as an exact
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lookup, you need to use 'defaults__exact'.
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"""
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obj, created = Person.objects.update_or_create(
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first_name='George', last_name='Harrison', defaults__exact='testing', defaults={
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'birthday': date(1943, 2, 25),
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'defaults': 'testing',
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}
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)
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self.assertTrue(created)
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self.assertEqual(obj.defaults, 'testing')
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obj, created = Person.objects.update_or_create(
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first_name='George', last_name='Harrison', defaults__exact='testing', defaults={
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'birthday': date(1943, 2, 25),
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'defaults': 'another testing',
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}
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)
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self.assertFalse(created)
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self.assertEqual(obj.defaults, 'another testing')
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def test_create_callable_default(self):
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obj, created = Person.objects.update_or_create(
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first_name='George', last_name='Harrison',
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defaults={'birthday': lambda: date(1943, 2, 25)},
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)
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self.assertIs(created, True)
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self.assertEqual(obj.birthday, date(1943, 2, 25))
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def test_update_callable_default(self):
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Person.objects.update_or_create(
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first_name='George', last_name='Harrison', birthday=date(1942, 2, 25),
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)
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obj, created = Person.objects.update_or_create(
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first_name='George',
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defaults={'last_name': lambda: 'NotHarrison'},
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)
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self.assertIs(created, False)
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self.assertEqual(obj.last_name, 'NotHarrison')
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class UpdateOrCreateTransactionTests(TransactionTestCase):
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available_apps = ['get_or_create']
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@skipUnlessDBFeature('has_select_for_update')
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@skipUnlessDBFeature('supports_transactions')
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def test_updates_in_transaction(self):
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"""
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Objects are selected and updated in a transaction to avoid race
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conditions. This test forces update_or_create() to hold the lock
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in another thread for a relatively long time so that it can update
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while it holds the lock. The updated field isn't a field in 'defaults',
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so update_or_create() shouldn't have an effect on it.
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"""
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lock_status = {'has_grabbed_lock': False}
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def birthday_sleep():
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lock_status['has_grabbed_lock'] = True
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time.sleep(0.5)
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return date(1940, 10, 10)
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def update_birthday_slowly():
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Person.objects.update_or_create(
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first_name='John', defaults={'birthday': birthday_sleep}
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)
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# Avoid leaking connection for Oracle
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connection.close()
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def lock_wait():
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# timeout after ~0.5 seconds
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for i in range(20):
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time.sleep(0.025)
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if lock_status['has_grabbed_lock']:
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return True
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return False
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Person.objects.create(first_name='John', last_name='Lennon', birthday=date(1940, 10, 9))
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# update_or_create in a separate thread
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t = Thread(target=update_birthday_slowly)
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before_start = datetime.now()
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t.start()
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if not lock_wait():
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self.skipTest('Database took too long to lock the row')
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# Update during lock
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Person.objects.filter(first_name='John').update(last_name='NotLennon')
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after_update = datetime.now()
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# Wait for thread to finish
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t.join()
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# The update remains and it blocked.
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updated_person = Person.objects.get(first_name='John')
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self.assertGreater(after_update - before_start, timedelta(seconds=0.5))
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self.assertEqual(updated_person.last_name, 'NotLennon')
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