def test_1to1_forward_deletion(self):
cust = models.Customer(name='test 1-1 deletion')
cust.save()
extra = models.CustomerExtraJunk(customer=cust)
extra.save()
models.signal_log.clear()
extra.delete()
# No signals on `cust`
self.assert_sent_exact('extra predelete', 'extra postdelete')
def test_1to1_forward_direct_assignment_obviously_fires(self):
customer = models.Customer(name='1to1 forward test', company=self.company)
customer.save()
models.signal_log.clear()
extra = models.CustomerExtraJunk()
extra.customer = customer
extra.save()
self.assert_sent_exact('extra junk presave', 'extra junk postsave')
def test_1to1_reverse_deletion_not_allowed(self):
# This was actually a bug as of django 1.8
# and was fixed in 1.9. https://code.djangoproject.com/ticket/14368
# So this test fails on 1.9!
cust = models.Customer(name='test 1-1 deletion')
cust.save()
extra = models.CustomerExtraJunk(customer=cust)
extra.save()
models.signal_log.clear()
with self.assertRaises(AttributeError):
cust.extrajunk = None
cust.save()
def test_1to1_reverse_direct_assignment_does_not_fire(self):
customer = models.Customer(name='1to1 reverse test', company=self.company)
customer.save()
extra = models.CustomerExtraJunk()
extra.save()
models.signal_log.clear()
customer.extrajunk = extra
customer.save()
self.assertIn('customer presave', models.signal_log.keys())
# Passes on both 1.8 and 1.9
self.assertNotIn('extra junk presave', models.signal_log.keys())
def test_1to1_reverse_direct_assignment_if_child_unsaved(self):
customer = models.Customer(name='1to1 unsaved forward test', company=self.company)
customer.save()
extra = models.CustomerExtraJunk() # NOT saving yet
customer.extrajunk = extra
customer.save() # This is allowed even though extra not saved!
self.assertEqual(extra.customer, customer)
# 'extra presave' not sent because extra isn't actually saved yet
self.assert_sent_exact('customer presave', 'customer postsave')
# reloading customer proves we didn't actually save the relationship yet
customer = models.Customer.objects.get(pk=customer.pk)
with self.assertRaises(Exception):
customer.extrajunk
# saving extra does the trick
extra.save()
customer = models.Customer.objects.get(pk=customer.pk)
self.assertEqual(customer.extrajunk, extra)
self.assert_sent_exact(
'customer presave', 'customer postsave', 'extra junk postsave', 'extra junk presave')
def test_1to1_forward_direct_assignment_not_allowed_if_child_unsaved(self):
customer = models.Customer(name='1to1 unsaved forward test', company=self.company)
extra = models.CustomerExtraJunk()
extra.customer = customer
with self.assertRaises(ValueError):
extra.save()