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from io import StringIO
from django.contrib.auth.models import User
from django.core import management
from django.test import TestCase
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.assertCountEqual(self.bob.group_set.all(), [self.rock, self.roll])
def test_retrieve_forward_m2m_items(self):
self.assertSequenceEqual(self.roll.members.all(), [self.bob])
def test_retrieve_reverse_m2m_items_via_custom_id_intermediary(self):
self.assertCountEqual(self.frank.group_set.all(), [self.rock, self.roll])
def test_retrieve_forward_m2m_items_via_custom_id_intermediary(self):
self.assertSequenceEqual(self.roll.user_members.all(), [self.frank])
def test_join_trimming_forwards(self):
"""
Too many copies of the intermediate table aren't involved when doing a
join (#8046, #8254).
"""
self.assertSequenceEqual(
self.rock.members.filter(membership__price=50),
[self.jim],
)
def test_join_trimming_reverse(self):
self.assertSequenceEqual(
self.bob.group_set.filter(membership__price=50),
[self.roll],
)
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(), """
<?xml version="1.0" encoding="utf-8"?>
<django-objects version="1.0">
<object pk="%(m_pk)s" model="m2m_through_regress.membership">
<field to="m2m_through_regress.person" name="person" rel="ManyToOneRel">%(p_pk)s</field>
<field to="m2m_through_regress.group" name="group" rel="ManyToOneRel">%(g_pk)s</field>
<field type="IntegerField" name="price">100</field>
</object>
<object pk="%(p_pk)s" model="m2m_through_regress.person">
<field type="CharField" name="name">Bob</field>
</object>
<object pk="%(g_pk)s" model="m2m_through_regress.group">
<field type="CharField" name="name">Roll</field>
</object>
</django-objects>
""".strip() % pks)
class ToFieldThroughTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.car = Car.objects.create(make="Toyota")
cls.driver = Driver.objects.create(name="Ryan Briscoe")
CarDriver.objects.create(car=cls.car, driver=cls.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
cls.unused_driver = Driver.objects.create(name="Barney Gumble")
# And two intentionally unused cars.
cls.unused_car1 = Car.objects.create(make="Trabant")
cls.unused_car2 = Car.objects.create(make="Wartburg")
def test_to_field(self):
self.assertSequenceEqual(self.car.drivers.all(), [self.driver])
def test_to_field_reverse(self):
self.assertSequenceEqual(self.driver.car_set.all(), [self.car])
def test_to_field_clear_reverse(self):
self.driver.car_set.clear()
self.assertSequenceEqual(self.driver.car_set.all(), [])
def test_to_field_clear(self):
self.car.drivers.clear()
self.assertSequenceEqual(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.assertSequenceEqual(self.car.drivers.all(), [self.driver])
# Yikes - barney is going to drive...
self.car.drivers._add_items('car', 'driver', self.unused_driver)
self.assertSequenceEqual(
self.car.drivers.all(),
[self.unused_driver, self.driver],
)
def test_m2m_relations_unusable_on_null_to_field(self):
nullcar = Car(make=None)
msg = (
'"<Car: None>" needs to have a value for field "make" before this '
'many-to-many relationship can be used.'
)
with self.assertRaisesMessage(ValueError, msg):
nullcar.drivers.all()
def test_m2m_relations_unusable_on_null_pk_obj(self):
msg = (
"'Car' instance needs to have a primary key value before a "
"many-to-many relationship can be used."
)
with self.assertRaisesMessage(ValueError, msg):
Car(make='Ford').drivers.all()
def test_add_related_null(self):
nulldriver = Driver.objects.create(name=None)
msg = 'Cannot add "<Driver: None>": the value for field "driver" is None'
with self.assertRaisesMessage(ValueError, msg):
self.car.drivers._add_items('car', 'driver', nulldriver)
def test_add_reverse(self):
car2 = Car.objects.create(make="Honda")
self.assertCountEqual(self.driver.car_set.all(), [self.car])
self.driver.car_set._add_items('driver', 'car', car2)
self.assertCountEqual(self.driver.car_set.all(), [self.car, car2])
def test_add_null_reverse(self):
nullcar = Car.objects.create(make=None)
msg = 'Cannot add "<Car: None>": the value for field "car" is None'
with self.assertRaisesMessage(ValueError, msg):
self.driver.car_set._add_items('driver', 'car', nullcar)
def test_add_null_reverse_related(self):
nulldriver = Driver.objects.create(name=None)
msg = (
'"<Driver: None>" needs to have a value for field "name" before '
'this many-to-many relationship can be used.'
)
with self.assertRaisesMessage(ValueError, msg):
nulldriver.car_set._add_items('driver', 'car', self.car)
def test_remove(self):
self.assertSequenceEqual(self.car.drivers.all(), [self.driver])
self.car.drivers._remove_items('car', 'driver', self.driver)
self.assertSequenceEqual(self.car.drivers.all(), [])
def test_remove_reverse(self):
self.assertSequenceEqual(self.driver.car_set.all(), [self.car])
self.driver.car_set._remove_items('driver', 'car', self.car)
self.assertSequenceEqual(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"}}]'
)
|
