109 lines
4.5 KiB
Python
109 lines
4.5 KiB
Python
import datetime
|
|
|
|
from django.conf import settings
|
|
from django.db import backend, connection, transaction, DEFAULT_DB_ALIAS
|
|
from django.test import TestCase, TransactionTestCase
|
|
|
|
from models import Book, Award, AwardNote, Person, Child, Toy, PlayedWith, PlayedWithNote
|
|
|
|
# Can't run this test under SQLite, because you can't
|
|
# get two connections to an in-memory database.
|
|
if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.sqlite3':
|
|
class DeleteLockingTest(TransactionTestCase):
|
|
def setUp(self):
|
|
# Create a second connection to the default database
|
|
conn_settings = settings.DATABASES[DEFAULT_DB_ALIAS]
|
|
self.conn2 = backend.DatabaseWrapper({
|
|
'HOST': conn_settings['HOST'],
|
|
'NAME': conn_settings['NAME'],
|
|
'OPTIONS': conn_settings['OPTIONS'],
|
|
'PASSWORD': conn_settings['PASSWORD'],
|
|
'PORT': conn_settings['PORT'],
|
|
'USER': conn_settings['USER'],
|
|
'TIME_ZONE': settings.TIME_ZONE,
|
|
})
|
|
|
|
# Put both DB connections into managed transaction mode
|
|
transaction.enter_transaction_management()
|
|
transaction.managed(True)
|
|
self.conn2._enter_transaction_management(True)
|
|
|
|
def tearDown(self):
|
|
# Close down the second connection.
|
|
transaction.leave_transaction_management()
|
|
self.conn2.close()
|
|
|
|
def test_concurrent_delete(self):
|
|
"Deletes on concurrent transactions don't collide and lock the database. Regression for #9479"
|
|
|
|
# Create some dummy data
|
|
b1 = Book(id=1, pagecount=100)
|
|
b2 = Book(id=2, pagecount=200)
|
|
b3 = Book(id=3, pagecount=300)
|
|
b1.save()
|
|
b2.save()
|
|
b3.save()
|
|
|
|
transaction.commit()
|
|
|
|
self.assertEquals(3, Book.objects.count())
|
|
|
|
# Delete something using connection 2.
|
|
cursor2 = self.conn2.cursor()
|
|
cursor2.execute('DELETE from delete_regress_book WHERE id=1')
|
|
self.conn2._commit();
|
|
|
|
# Now perform a queryset delete that covers the object
|
|
# deleted in connection 2. This causes an infinite loop
|
|
# under MySQL InnoDB unless we keep track of already
|
|
# deleted objects.
|
|
Book.objects.filter(pagecount__lt=250).delete()
|
|
transaction.commit()
|
|
self.assertEquals(1, Book.objects.count())
|
|
|
|
class DeleteCascadeTests(TestCase):
|
|
def test_generic_relation_cascade(self):
|
|
"""
|
|
Test that Django cascades deletes through generic-related
|
|
objects to their reverse relations.
|
|
|
|
This might falsely succeed if the database cascades deletes
|
|
itself immediately; the postgresql_psycopg2 backend does not
|
|
give such a false success because ForeignKeys are created with
|
|
DEFERRABLE INITIALLY DEFERRED, so its internal cascade is
|
|
delayed until transaction commit.
|
|
|
|
"""
|
|
person = Person.objects.create(name='Nelson Mandela')
|
|
award = Award.objects.create(name='Nobel', content_object=person)
|
|
note = AwardNote.objects.create(note='a peace prize',
|
|
award=award)
|
|
self.assertEquals(AwardNote.objects.count(), 1)
|
|
person.delete()
|
|
self.assertEquals(Award.objects.count(), 0)
|
|
# first two asserts are just sanity checks, this is the kicker:
|
|
self.assertEquals(AwardNote.objects.count(), 0)
|
|
|
|
def test_fk_to_m2m_through(self):
|
|
"""
|
|
Test that if a M2M relationship has an explicitly-specified
|
|
through model, and some other model has an FK to that through
|
|
model, deletion is cascaded from one of the participants in
|
|
the M2M, to the through model, to its related model.
|
|
|
|
Like the above test, this could in theory falsely succeed if
|
|
the DB cascades deletes itself immediately.
|
|
|
|
"""
|
|
juan = Child.objects.create(name='Juan')
|
|
paints = Toy.objects.create(name='Paints')
|
|
played = PlayedWith.objects.create(child=juan, toy=paints,
|
|
date=datetime.date.today())
|
|
note = PlayedWithNote.objects.create(played=played,
|
|
note='the next Jackson Pollock')
|
|
self.assertEquals(PlayedWithNote.objects.count(), 1)
|
|
paints.delete()
|
|
self.assertEquals(PlayedWith.objects.count(), 0)
|
|
# first two asserts just sanity checks, this is the kicker:
|
|
self.assertEquals(PlayedWithNote.objects.count(), 0)
|