mirror of
https://github.com/django/django.git
synced 2024-12-23 17:46:27 +00:00
494 lines
17 KiB
Python
494 lines
17 KiB
Python
"""
|
|
Testing signals emitted on changing m2m relations.
|
|
"""
|
|
|
|
from django.db import models
|
|
from django.test import TestCase
|
|
|
|
from .models import Car, Part, Person, SportsCar
|
|
|
|
|
|
class ManyToManySignalsTest(TestCase):
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
cls.vw = Car.objects.create(name='VW')
|
|
cls.bmw = Car.objects.create(name='BMW')
|
|
cls.toyota = Car.objects.create(name='Toyota')
|
|
|
|
cls.wheelset = Part.objects.create(name='Wheelset')
|
|
cls.doors = Part.objects.create(name='Doors')
|
|
cls.engine = Part.objects.create(name='Engine')
|
|
cls.airbag = Part.objects.create(name='Airbag')
|
|
cls.sunroof = Part.objects.create(name='Sunroof')
|
|
|
|
cls.alice = Person.objects.create(name='Alice')
|
|
cls.bob = Person.objects.create(name='Bob')
|
|
cls.chuck = Person.objects.create(name='Chuck')
|
|
cls.daisy = Person.objects.create(name='Daisy')
|
|
|
|
def setUp(self):
|
|
self.m2m_changed_messages = []
|
|
|
|
def m2m_changed_signal_receiver(self, signal, sender, **kwargs):
|
|
message = {
|
|
'instance': kwargs['instance'],
|
|
'action': kwargs['action'],
|
|
'reverse': kwargs['reverse'],
|
|
'model': kwargs['model'],
|
|
}
|
|
if kwargs['pk_set']:
|
|
message['objects'] = list(
|
|
kwargs['model'].objects.filter(pk__in=kwargs['pk_set'])
|
|
)
|
|
self.m2m_changed_messages.append(message)
|
|
|
|
def tearDown(self):
|
|
# disconnect all signal handlers
|
|
models.signals.m2m_changed.disconnect(
|
|
self.m2m_changed_signal_receiver, Car.default_parts.through
|
|
)
|
|
models.signals.m2m_changed.disconnect(
|
|
self.m2m_changed_signal_receiver, Car.optional_parts.through
|
|
)
|
|
models.signals.m2m_changed.disconnect(
|
|
self.m2m_changed_signal_receiver, Person.fans.through
|
|
)
|
|
models.signals.m2m_changed.disconnect(
|
|
self.m2m_changed_signal_receiver, Person.friends.through
|
|
)
|
|
|
|
def _initialize_signal_car(self, add_default_parts_before_set_signal=False):
|
|
""" Install a listener on the two m2m relations. """
|
|
models.signals.m2m_changed.connect(
|
|
self.m2m_changed_signal_receiver, Car.optional_parts.through
|
|
)
|
|
if add_default_parts_before_set_signal:
|
|
# adding a default part to our car - no signal listener installed
|
|
self.vw.default_parts.add(self.sunroof)
|
|
models.signals.m2m_changed.connect(
|
|
self.m2m_changed_signal_receiver, Car.default_parts.through
|
|
)
|
|
|
|
def test_pk_set_on_repeated_add_remove(self):
|
|
"""
|
|
m2m_changed is always fired, even for repeated calls to the same
|
|
method, but the behavior of pk_sets differs by action.
|
|
|
|
- For signals related to `add()`, only PKs that will actually be
|
|
inserted are sent.
|
|
- For `remove()` all PKs are sent, even if they will not affect the DB.
|
|
"""
|
|
pk_sets_sent = []
|
|
|
|
def handler(signal, sender, **kwargs):
|
|
if kwargs['action'] in ['pre_add', 'pre_remove']:
|
|
pk_sets_sent.append(kwargs['pk_set'])
|
|
|
|
models.signals.m2m_changed.connect(handler, Car.default_parts.through)
|
|
|
|
self.vw.default_parts.add(self.wheelset)
|
|
self.vw.default_parts.add(self.wheelset)
|
|
|
|
self.vw.default_parts.remove(self.wheelset)
|
|
self.vw.default_parts.remove(self.wheelset)
|
|
|
|
expected_pk_sets = [{self.wheelset.pk}, set(), {self.wheelset.pk}, {self.wheelset.pk}]
|
|
self.assertEqual(pk_sets_sent, expected_pk_sets)
|
|
|
|
models.signals.m2m_changed.disconnect(handler, Car.default_parts.through)
|
|
|
|
def test_m2m_relations_add_remove_clear(self):
|
|
expected_messages = []
|
|
|
|
self._initialize_signal_car(add_default_parts_before_set_signal=True)
|
|
|
|
self.vw.default_parts.add(self.wheelset, self.doors, self.engine)
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors, self.engine, self.wheelset],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors, self.engine, self.wheelset],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
# give the BMW and Toyota some doors as well
|
|
self.doors.car_set.add(self.bmw, self.toyota)
|
|
expected_messages.append({
|
|
'instance': self.doors,
|
|
'action': 'pre_add',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [self.bmw, self.toyota],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.doors,
|
|
'action': 'post_add',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [self.bmw, self.toyota],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
def test_m2m_relations_signals_remove_relation(self):
|
|
self._initialize_signal_car()
|
|
# remove the engine from the self.vw and the airbag (which is not set
|
|
# but is returned)
|
|
self.vw.default_parts.remove(self.engine, self.airbag)
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.vw,
|
|
'action': 'pre_remove',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.airbag, self.engine],
|
|
}, {
|
|
'instance': self.vw,
|
|
'action': 'post_remove',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.airbag, self.engine],
|
|
}
|
|
])
|
|
|
|
def test_m2m_relations_signals_give_the_self_vw_some_optional_parts(self):
|
|
expected_messages = []
|
|
|
|
self._initialize_signal_car()
|
|
|
|
# give the self.vw some optional parts (second relation to same model)
|
|
self.vw.optional_parts.add(self.airbag, self.sunroof)
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.airbag, self.sunroof],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.airbag, self.sunroof],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
# add airbag to all the cars (even though the self.vw already has one)
|
|
self.airbag.cars_optional.add(self.vw, self.bmw, self.toyota)
|
|
expected_messages.append({
|
|
'instance': self.airbag,
|
|
'action': 'pre_add',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [self.bmw, self.toyota],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.airbag,
|
|
'action': 'post_add',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [self.bmw, self.toyota],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
def test_m2m_relations_signals_reverse_relation_with_custom_related_name(self):
|
|
self._initialize_signal_car()
|
|
# remove airbag from the self.vw (reverse relation with custom
|
|
# related_name)
|
|
self.airbag.cars_optional.remove(self.vw)
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.airbag,
|
|
'action': 'pre_remove',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [self.vw],
|
|
}, {
|
|
'instance': self.airbag,
|
|
'action': 'post_remove',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [self.vw],
|
|
}
|
|
])
|
|
|
|
def test_m2m_relations_signals_clear_all_parts_of_the_self_vw(self):
|
|
self._initialize_signal_car()
|
|
# clear all parts of the self.vw
|
|
self.vw.default_parts.clear()
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.vw,
|
|
'action': 'pre_clear',
|
|
'reverse': False,
|
|
'model': Part,
|
|
}, {
|
|
'instance': self.vw,
|
|
'action': 'post_clear',
|
|
'reverse': False,
|
|
'model': Part,
|
|
}
|
|
])
|
|
|
|
def test_m2m_relations_signals_all_the_doors_off_of_cars(self):
|
|
self._initialize_signal_car()
|
|
# take all the doors off of cars
|
|
self.doors.car_set.clear()
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.doors,
|
|
'action': 'pre_clear',
|
|
'reverse': True,
|
|
'model': Car,
|
|
}, {
|
|
'instance': self.doors,
|
|
'action': 'post_clear',
|
|
'reverse': True,
|
|
'model': Car,
|
|
}
|
|
])
|
|
|
|
def test_m2m_relations_signals_reverse_relation(self):
|
|
self._initialize_signal_car()
|
|
# take all the airbags off of cars (clear reverse relation with custom
|
|
# related_name)
|
|
self.airbag.cars_optional.clear()
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.airbag,
|
|
'action': 'pre_clear',
|
|
'reverse': True,
|
|
'model': Car,
|
|
}, {
|
|
'instance': self.airbag,
|
|
'action': 'post_clear',
|
|
'reverse': True,
|
|
'model': Car,
|
|
}
|
|
])
|
|
|
|
def test_m2m_relations_signals_alternative_ways(self):
|
|
expected_messages = []
|
|
|
|
self._initialize_signal_car()
|
|
|
|
# alternative ways of setting relation:
|
|
self.vw.default_parts.create(name='Windows')
|
|
p6 = Part.objects.get(name='Windows')
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [p6],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [p6],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
# direct assignment clears the set first, then adds
|
|
self.vw.default_parts.set([self.wheelset, self.doors, self.engine])
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_remove',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [p6],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_remove',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [p6],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors, self.engine, self.wheelset],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors, self.engine, self.wheelset],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
def test_m2m_relations_signals_clearing_removing(self):
|
|
expected_messages = []
|
|
|
|
self._initialize_signal_car(add_default_parts_before_set_signal=True)
|
|
|
|
# set by clearing.
|
|
self.vw.default_parts.set([self.wheelset, self.doors, self.engine], clear=True)
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_clear',
|
|
'reverse': False,
|
|
'model': Part,
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_clear',
|
|
'reverse': False,
|
|
'model': Part,
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors, self.engine, self.wheelset],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors, self.engine, self.wheelset],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
# set by only removing what's necessary.
|
|
self.vw.default_parts.set([self.wheelset, self.doors], clear=False)
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'pre_remove',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.engine],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.vw,
|
|
'action': 'post_remove',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.engine],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
def test_m2m_relations_signals_when_inheritance(self):
|
|
expected_messages = []
|
|
|
|
self._initialize_signal_car(add_default_parts_before_set_signal=True)
|
|
|
|
# Signals still work when model inheritance is involved
|
|
c4 = SportsCar.objects.create(name='Bugatti', price='1000000')
|
|
c4b = Car.objects.get(name='Bugatti')
|
|
c4.default_parts.set([self.doors])
|
|
expected_messages.append({
|
|
'instance': c4,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors],
|
|
})
|
|
expected_messages.append({
|
|
'instance': c4,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Part,
|
|
'objects': [self.doors],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
self.engine.car_set.add(c4)
|
|
expected_messages.append({
|
|
'instance': self.engine,
|
|
'action': 'pre_add',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [c4b],
|
|
})
|
|
expected_messages.append({
|
|
'instance': self.engine,
|
|
'action': 'post_add',
|
|
'reverse': True,
|
|
'model': Car,
|
|
'objects': [c4b],
|
|
})
|
|
self.assertEqual(self.m2m_changed_messages, expected_messages)
|
|
|
|
def _initialize_signal_person(self):
|
|
# Install a listener on the two m2m relations.
|
|
models.signals.m2m_changed.connect(
|
|
self.m2m_changed_signal_receiver, Person.fans.through
|
|
)
|
|
models.signals.m2m_changed.connect(
|
|
self.m2m_changed_signal_receiver, Person.friends.through
|
|
)
|
|
|
|
def test_m2m_relations_with_self_add_friends(self):
|
|
self._initialize_signal_person()
|
|
self.alice.friends.set([self.bob, self.chuck])
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.alice,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Person,
|
|
'objects': [self.bob, self.chuck],
|
|
}, {
|
|
'instance': self.alice,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Person,
|
|
'objects': [self.bob, self.chuck],
|
|
}
|
|
])
|
|
|
|
def test_m2m_relations_with_self_add_fan(self):
|
|
self._initialize_signal_person()
|
|
self.alice.fans.set([self.daisy])
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.alice,
|
|
'action': 'pre_add',
|
|
'reverse': False,
|
|
'model': Person,
|
|
'objects': [self.daisy],
|
|
}, {
|
|
'instance': self.alice,
|
|
'action': 'post_add',
|
|
'reverse': False,
|
|
'model': Person,
|
|
'objects': [self.daisy],
|
|
}
|
|
])
|
|
|
|
def test_m2m_relations_with_self_add_idols(self):
|
|
self._initialize_signal_person()
|
|
self.chuck.idols.set([self.alice, self.bob])
|
|
self.assertEqual(self.m2m_changed_messages, [
|
|
{
|
|
'instance': self.chuck,
|
|
'action': 'pre_add',
|
|
'reverse': True,
|
|
'model': Person,
|
|
'objects': [self.alice, self.bob],
|
|
}, {
|
|
'instance': self.chuck,
|
|
'action': 'post_add',
|
|
'reverse': True,
|
|
'model': Person,
|
|
'objects': [self.alice, self.bob],
|
|
}
|
|
])
|