def test_m2m_direct_forward_does_not_fire_related_presave(self):
company = self.company
customer = models.Customer(name='testing m2m direct forward', company=company)
customer.save()
cat1 = models.CustomerCategory(name='m2m cat 1')
cat1.save()
cat2 = models.CustomerCategory(name='m2m cat 2')
cat2.save()
models.signal_log.clear()
customer.categories_direct = [cat1, cat2]
customer.save()
# The related model (categories) don't get presave
self.assert_sent_exact('customer presave', 'customer postsave')
def test_m2m_indirect_forward_fires_through_presave_but_not_rel_presave(self):
company = self.company
customer = models.Customer(name='testing m2m forward', company=company)
customer.save()
cat1 = models.CustomerCategory(name='m2m cat 1')
cat1.save()
cat2 = models.CustomerCategory(name='m2m cat 2')
cat2.save()
models.signal_log.clear()
rel = models.CustomerCategoryRel(customer=customer, category=cat1)
rel.save()
# The 'through' model gets a presave, but not the related model (categories)
self.assert_sent_exact('rel presave', 'rel postsave')
def test_m2m_direct_assigment_does_not_allow_unsaved_children(self):
customer = models.Customer(name='test unsaved m2m children')
customer.save()
cat1 = models.CustomerCategory(name='cat1')
with self.assertRaises(ValueError):
customer.categories_direct = [cat1]
with self.assertRaises(ValueError):
customer.categories_direct.add(cat1)
def test_m2m_direct_reverse_does_not_fire_related_presave(self):
company = self.company
customer = models.Customer(name='testing m2m direct reverse', company=company)
customer.save()
cat1 = models.CustomerCategory(name='m2m cat 1')
cat1.save()
cat2 = models.CustomerCategory(name='m2m cat 2')
cat2.save()
models.signal_log.clear()
cat1.customers_direct = [customer]
cat2.customers_direct = [customer]
cat1.save()
cat2.save()
# The customer is not saved.
self.assert_sent_exact('category presave', 'category postsave')
def test_m2m_indirect_cannot_set_attr_directly(self):
company = self.company
customer = models.Customer(name='testing m2m forward', company=company)
customer.save()
cat1 = models.CustomerCategory(name='m2m cat 1')
cat1.save()
cat2 = models.CustomerCategory(name='m2m cat 2')
cat2.save()
models.signal_log.clear()
with self.assertRaises(AttributeError):
# TIL you can't do this if there's a `through` model.
customer.categories_indirect = [cat1, cat2]
with self.assertRaises(AttributeError):
# TIL you can't do this if there's a `through` model.
cat1.customers_indirect = [customer]
def test_MtoM_direct_reverse_deletion_does_not_send_related_signals(self):
customer = models.Customer(name='cust')
customer.save()
cat1 = models.CustomerCategory()
cat1.save()
cat1.customers_direct = [customer]
cat1.save()
models.signal_log.clear()
cat1.customers_direct = []
cat1.save()
self.assert_sent_exact('category presave', 'category postsave')
def test_MtoM_indirect_deletion(self):
company = self.company
customer = models.Customer(name='testing m2m forward', company=company)
customer.save()
cat1 = models.CustomerCategory(name='m2m cat 1')
cat1.save()
rel = models.CustomerCategoryRel(customer=customer, category=cat1)
rel.save()
models.signal_log.clear()
rel.delete()
# The 'through' model gets a signal, but not the relateds
self.assert_sent_exact('rel predelete', 'rel postdelete')