261 lines
8.9 KiB
Python
261 lines
8.9 KiB
Python
from __future__ import absolute_import
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import datetime
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from django.conf import settings
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from django.db import backend, transaction, DEFAULT_DB_ALIAS
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from django.test import TestCase, TransactionTestCase, skipUnlessDBFeature
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from .models import (Book, Award, AwardNote, Person, Child, Toy, PlayedWith,
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PlayedWithNote, Email, Researcher, Food, Eaten, Policy, Version, Location,
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Item, Image, File, Photo, FooFile, FooImage, FooPhoto, FooFileProxy)
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# Can't run this test under SQLite, because you can't
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# get two connections to an in-memory database.
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class DeleteLockingTest(TransactionTestCase):
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def setUp(self):
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# Create a second connection to the default database
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conn_settings = settings.DATABASES[DEFAULT_DB_ALIAS]
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self.conn2 = backend.DatabaseWrapper({
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'HOST': conn_settings['HOST'],
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'NAME': conn_settings['NAME'],
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'OPTIONS': conn_settings['OPTIONS'],
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'PASSWORD': conn_settings['PASSWORD'],
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'PORT': conn_settings['PORT'],
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'USER': conn_settings['USER'],
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'TIME_ZONE': settings.TIME_ZONE,
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})
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# Put both DB connections into managed transaction mode
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transaction.enter_transaction_management()
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transaction.managed(True)
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self.conn2._enter_transaction_management(True)
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def tearDown(self):
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# Close down the second connection.
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transaction.leave_transaction_management()
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self.conn2.close()
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@skipUnlessDBFeature('test_db_allows_multiple_connections')
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def test_concurrent_delete(self):
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"Deletes on concurrent transactions don't collide and lock the database. Regression for #9479"
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# Create some dummy data
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b1 = Book(id=1, pagecount=100)
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b2 = Book(id=2, pagecount=200)
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b3 = Book(id=3, pagecount=300)
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b1.save()
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b2.save()
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b3.save()
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transaction.commit()
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self.assertEqual(3, Book.objects.count())
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# Delete something using connection 2.
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cursor2 = self.conn2.cursor()
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cursor2.execute('DELETE from delete_regress_book WHERE id=1')
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self.conn2._commit()
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# Now perform a queryset delete that covers the object
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# deleted in connection 2. This causes an infinite loop
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# under MySQL InnoDB unless we keep track of already
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# deleted objects.
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Book.objects.filter(pagecount__lt=250).delete()
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transaction.commit()
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self.assertEqual(1, Book.objects.count())
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transaction.commit()
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class DeleteCascadeTests(TestCase):
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def test_generic_relation_cascade(self):
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"""
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Django cascades deletes through generic-related objects to their
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reverse relations.
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"""
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person = Person.objects.create(name='Nelson Mandela')
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award = Award.objects.create(name='Nobel', content_object=person)
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note = AwardNote.objects.create(note='a peace prize',
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award=award)
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self.assertEqual(AwardNote.objects.count(), 1)
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person.delete()
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self.assertEqual(Award.objects.count(), 0)
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# first two asserts are just sanity checks, this is the kicker:
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self.assertEqual(AwardNote.objects.count(), 0)
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def test_fk_to_m2m_through(self):
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"""
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If an M2M relationship has an explicitly-specified through model, and
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some other model has an FK to that through model, deletion is cascaded
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from one of the participants in the M2M, to the through model, to its
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related model.
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"""
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juan = Child.objects.create(name='Juan')
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paints = Toy.objects.create(name='Paints')
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played = PlayedWith.objects.create(child=juan, toy=paints,
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date=datetime.date.today())
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note = PlayedWithNote.objects.create(played=played,
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note='the next Jackson Pollock')
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self.assertEqual(PlayedWithNote.objects.count(), 1)
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paints.delete()
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self.assertEqual(PlayedWith.objects.count(), 0)
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# first two asserts just sanity checks, this is the kicker:
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self.assertEqual(PlayedWithNote.objects.count(), 0)
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def test_15776(self):
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policy = Policy.objects.create(pk=1, policy_number="1234")
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version = Version.objects.create(policy=policy)
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location = Location.objects.create(version=version)
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item = Item.objects.create(version=version, location=location)
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policy.delete()
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class DeleteCascadeTransactionTests(TransactionTestCase):
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def test_inheritance(self):
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"""
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Auto-created many-to-many through tables referencing a parent model are
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correctly found by the delete cascade when a child of that parent is
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deleted.
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Refs #14896.
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"""
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r = Researcher.objects.create()
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email = Email.objects.create(
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label="office-email", email_address="carl@science.edu"
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)
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r.contacts.add(email)
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email.delete()
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def test_to_field(self):
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"""
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Cascade deletion works with ForeignKey.to_field set to non-PK.
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"""
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apple = Food.objects.create(name="apple")
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eaten = Eaten.objects.create(food=apple, meal="lunch")
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apple.delete()
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class LargeDeleteTests(TestCase):
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def test_large_deletes(self):
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"Regression for #13309 -- if the number of objects > chunk size, deletion still occurs"
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for x in range(300):
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track = Book.objects.create(pagecount=x+100)
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Book.objects.all().delete()
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self.assertEqual(Book.objects.count(), 0)
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class ProxyDeleteTest(TestCase):
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"""
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Tests on_delete behavior for proxy models.
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See #16128.
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"""
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def create_image(self):
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"""Return an Image referenced by both a FooImage and a FooFile."""
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# Create an Image
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test_image = Image()
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test_image.save()
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foo_image = FooImage(my_image=test_image)
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foo_image.save()
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# Get the Image instance as a File
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test_file = File.objects.get(pk=test_image.pk)
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foo_file = FooFile(my_file=test_file)
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foo_file.save()
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return test_image
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def test_delete_proxy(self):
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"""
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Deleting the *proxy* instance bubbles through to its non-proxy and
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*all* referring objects are deleted.
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"""
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self.create_image()
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Image.objects.all().delete()
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# An Image deletion == File deletion
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self.assertEqual(len(Image.objects.all()), 0)
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self.assertEqual(len(File.objects.all()), 0)
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# The Image deletion cascaded and *all* references to it are deleted.
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self.assertEqual(len(FooImage.objects.all()), 0)
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self.assertEqual(len(FooFile.objects.all()), 0)
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def test_delete_proxy_of_proxy(self):
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"""
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Deleting a proxy-of-proxy instance should bubble through to its proxy
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and non-proxy parents, deleting *all* referring objects.
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"""
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test_image = self.create_image()
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# Get the Image as a Photo
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test_photo = Photo.objects.get(pk=test_image.pk)
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foo_photo = FooPhoto(my_photo=test_photo)
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foo_photo.save()
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Photo.objects.all().delete()
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# A Photo deletion == Image deletion == File deletion
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self.assertEqual(len(Photo.objects.all()), 0)
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self.assertEqual(len(Image.objects.all()), 0)
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self.assertEqual(len(File.objects.all()), 0)
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# The Photo deletion should have cascaded and deleted *all*
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# references to it.
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self.assertEqual(len(FooPhoto.objects.all()), 0)
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self.assertEqual(len(FooFile.objects.all()), 0)
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self.assertEqual(len(FooImage.objects.all()), 0)
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def test_delete_concrete_parent(self):
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"""
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Deleting an instance of a concrete model should also delete objects
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referencing its proxy subclass.
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"""
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self.create_image()
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File.objects.all().delete()
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# A File deletion == Image deletion
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self.assertEqual(len(File.objects.all()), 0)
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self.assertEqual(len(Image.objects.all()), 0)
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# The File deletion should have cascaded and deleted *all* references
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# to it.
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self.assertEqual(len(FooFile.objects.all()), 0)
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self.assertEqual(len(FooImage.objects.all()), 0)
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def test_delete_proxy_pair(self):
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"""
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If a pair of proxy models are linked by an FK from one concrete parent
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to the other, deleting one proxy model cascade-deletes the other, and
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the deletion happens in the right order (not triggering an
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IntegrityError on databases unable to defer integrity checks).
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Refs #17918.
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"""
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# Create an Image (proxy of File) and FooFileProxy (proxy of FooFile,
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# which has an FK to File)
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image = Image.objects.create()
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as_file = File.objects.get(pk=image.pk)
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FooFileProxy.objects.create(my_file=as_file)
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Image.objects.all().delete()
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self.assertEqual(len(FooFileProxy.objects.all()), 0)
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