from __future__ import unicode_literals from django.contrib.auth.models import User from django.core import management from django.test import TestCase from django.utils.six import StringIO from .models import ( Car, CarDriver, Driver, Group, Membership, Person, UserMembership, ) class M2MThroughTestCase(TestCase): @classmethod def setUpTestData(cls): cls.bob = Person.objects.create(name="Bob") cls.jim = Person.objects.create(name="Jim") cls.rock = Group.objects.create(name="Rock") cls.roll = Group.objects.create(name="Roll") cls.frank = User.objects.create_user("frank", "frank@example.com", "password") cls.jane = User.objects.create_user("jane", "jane@example.com", "password") # normal intermediate model cls.bob_rock = Membership.objects.create(person=cls.bob, group=cls.rock) cls.bob_roll = Membership.objects.create(person=cls.bob, group=cls.roll, price=50) cls.jim_rock = Membership.objects.create(person=cls.jim, group=cls.rock, price=50) # intermediate model with custom id column cls.frank_rock = UserMembership.objects.create(user=cls.frank, group=cls.rock) cls.frank_roll = UserMembership.objects.create(user=cls.frank, group=cls.roll) cls.jane_rock = UserMembership.objects.create(user=cls.jane, group=cls.rock) def test_retrieve_reverse_m2m_items(self): self.assertQuerysetEqual( self.bob.group_set.all(), [ "", "", ], ordered=False ) def test_retrieve_forward_m2m_items(self): self.assertQuerysetEqual( self.roll.members.all(), [ "", ] ) def test_cannot_use_setattr_on_reverse_m2m_with_intermediary_model(self): msg = ( "Cannot set values on a ManyToManyField which specifies an " "intermediary model. Use m2m_through_regress.Membership's Manager " "instead." ) with self.assertRaisesMessage(AttributeError, msg): self.bob.group_set.set([]) def test_cannot_use_setattr_on_forward_m2m_with_intermediary_model(self): msg = ( "Cannot set values on a ManyToManyField which specifies an " "intermediary model. Use m2m_through_regress.Membership's Manager " "instead." ) with self.assertRaisesMessage(AttributeError, msg): self.roll.members.set([]) def test_cannot_use_create_on_m2m_with_intermediary_model(self): with self.assertRaises(AttributeError): self.rock.members.create(name="Anne") def test_cannot_use_create_on_reverse_m2m_with_intermediary_model(self): with self.assertRaises(AttributeError): self.bob.group_set.create(name="Funk") def test_retrieve_reverse_m2m_items_via_custom_id_intermediary(self): self.assertQuerysetEqual( self.frank.group_set.all(), [ "", "", ], ordered=False ) def test_retrieve_forward_m2m_items_via_custom_id_intermediary(self): self.assertQuerysetEqual( self.roll.user_members.all(), [ "", ] ) def test_join_trimming_forwards(self): "Check that we don't involve too many copies of the intermediate table when doing a join. Refs #8046, #8254" self.assertQuerysetEqual( self.rock.members.filter(membership__price=50), [ "", ] ) def test_join_trimming_reverse(self): self.assertQuerysetEqual( self.bob.group_set.filter(membership__price=50), [ "", ] ) class M2MThroughSerializationTestCase(TestCase): @classmethod def setUpTestData(cls): cls.bob = Person.objects.create(name="Bob") cls.roll = Group.objects.create(name="Roll") cls.bob_roll = Membership.objects.create(person=cls.bob, group=cls.roll) def test_serialization(self): "m2m-through models aren't serialized as m2m fields. Refs #8134" pks = {"p_pk": self.bob.pk, "g_pk": self.roll.pk, "m_pk": self.bob_roll.pk} out = StringIO() management.call_command("dumpdata", "m2m_through_regress", format="json", stdout=out) self.assertJSONEqual( out.getvalue().strip(), '[{"pk": %(m_pk)s, "model": "m2m_through_regress.membership", "fields": {"person": %(p_pk)s, "price": ' '100, "group": %(g_pk)s}}, {"pk": %(p_pk)s, "model": "m2m_through_regress.person", "fields": {"name": ' '"Bob"}}, {"pk": %(g_pk)s, "model": "m2m_through_regress.group", "fields": {"name": "Roll"}}]' % pks ) out = StringIO() management.call_command("dumpdata", "m2m_through_regress", format="xml", indent=2, stdout=out) self.assertXMLEqual(out.getvalue().strip(), """ %(p_pk)s %(g_pk)s 100 Bob Roll """.strip() % pks) class ToFieldThroughTests(TestCase): def setUp(self): self.car = Car.objects.create(make="Toyota") self.driver = Driver.objects.create(name="Ryan Briscoe") CarDriver.objects.create(car=self.car, driver=self.driver) # We are testing if wrong objects get deleted due to using wrong # field value in m2m queries. So, it is essential that the pk # numberings do not match. # Create one intentionally unused driver to mix up the autonumbering self.unused_driver = Driver.objects.create(name="Barney Gumble") # And two intentionally unused cars. self.unused_car1 = Car.objects.create(make="Trabant") self.unused_car2 = Car.objects.create(make="Wartburg") def test_to_field(self): self.assertQuerysetEqual( self.car.drivers.all(), [""] ) def test_to_field_reverse(self): self.assertQuerysetEqual( self.driver.car_set.all(), [""] ) def test_to_field_clear_reverse(self): self.driver.car_set.clear() self.assertQuerysetEqual( self.driver.car_set.all(), []) def test_to_field_clear(self): self.car.drivers.clear() self.assertQuerysetEqual( self.car.drivers.all(), []) # Low level tests for _add_items and _remove_items. We test these methods # because .add/.remove aren't available for m2m fields with through, but # through is the only way to set to_field currently. We do want to make # sure these methods are ready if the ability to use .add or .remove with # to_field relations is added some day. def test_add(self): self.assertQuerysetEqual( self.car.drivers.all(), [""] ) # Yikes - barney is going to drive... self.car.drivers._add_items('car', 'driver', self.unused_driver) self.assertQuerysetEqual( self.car.drivers.all(), ["", ""] ) def test_add_null(self): nullcar = Car.objects.create(make=None) with self.assertRaises(ValueError): nullcar.drivers._add_items('car', 'driver', self.unused_driver) def test_add_related_null(self): nulldriver = Driver.objects.create(name=None) with self.assertRaises(ValueError): self.car.drivers._add_items('car', 'driver', nulldriver) def test_add_reverse(self): car2 = Car.objects.create(make="Honda") self.assertQuerysetEqual( self.driver.car_set.all(), [""] ) self.driver.car_set._add_items('driver', 'car', car2) self.assertQuerysetEqual( self.driver.car_set.all(), ["", ""], ordered=False ) def test_add_null_reverse(self): nullcar = Car.objects.create(make=None) with self.assertRaises(ValueError): self.driver.car_set._add_items('driver', 'car', nullcar) def test_add_null_reverse_related(self): nulldriver = Driver.objects.create(name=None) with self.assertRaises(ValueError): nulldriver.car_set._add_items('driver', 'car', self.car) def test_remove(self): self.assertQuerysetEqual( self.car.drivers.all(), [""] ) self.car.drivers._remove_items('car', 'driver', self.driver) self.assertQuerysetEqual( self.car.drivers.all(), []) def test_remove_reverse(self): self.assertQuerysetEqual( self.driver.car_set.all(), [""] ) self.driver.car_set._remove_items('driver', 'car', self.car) self.assertQuerysetEqual( self.driver.car_set.all(), []) class ThroughLoadDataTestCase(TestCase): fixtures = ["m2m_through"] def test_sequence_creation(self): """ Sequences on an m2m_through are created for the through model, not a phantom auto-generated m2m table (#11107). """ out = StringIO() management.call_command("dumpdata", "m2m_through_regress", format="json", stdout=out) self.assertJSONEqual( out.getvalue().strip(), '[{"pk": 1, "model": "m2m_through_regress.usermembership", "fields": {"price": 100, "group": 1, "user"' ': 1}}, {"pk": 1, "model": "m2m_through_regress.person", "fields": {"name": "Guido"}}, {"pk": 1, ' '"model": "m2m_through_regress.group", "fields": {"name": "Python Core Group"}}]' )