django1/tests/m2m_signals/tests.py

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"""
Testing signals emitted on changing m2m relations.
"""
from django.db import models
from django.test import TestCase
from .models import Part, Car, SportsCar, Person
class ManyToManySignalsTest(TestCase):
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 setUp(self):
self.m2m_changed_messages = []
self.vw = Car.objects.create(name='VW')
self.bmw = Car.objects.create(name='BMW')
self.toyota = Car.objects.create(name='Toyota')
self.wheelset = Part.objects.create(name='Wheelset')
self.doors = Part.objects.create(name='Doors')
self.engine = Part.objects.create(name='Engine')
self.airbag = Part.objects.create(name='Airbag')
self.sunroof = Part.objects.create(name='Sunroof')
self.alice = Person.objects.create(name='Alice')
self.bob = Person.objects.create(name='Bob')
self.chuck = Person.objects.create(name='Chuck')
self.daisy = Person.objects.create(name='Daisy')
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 test_m2m_relations_add_remove_clear(self):
expected_messages = []
# Install a listener on one of the two m2m relations.
models.signals.m2m_changed.connect(
self.m2m_changed_signal_receiver, Car.optional_parts.through
)
# Test the add, remove and clear methods on both sides of the
# many-to-many relation
# adding a default part to our car - no signal listener installed
self.vw.default_parts.add(self.sunroof)
# Now install a listener
models.signals.m2m_changed.connect(
self.m2m_changed_signal_receiver, Car.default_parts.through
)
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 Toyata 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)
# 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)
expected_messages.append({
'instance': self.vw,
'action': 'pre_remove',
'reverse': False,
'model': Part,
'objects': [self.airbag, self.engine],
})
expected_messages.append({
'instance': self.vw,
'action': 'post_remove',
'reverse': False,
'model': Part,
'objects': [self.airbag, self.engine],
})
self.assertEqual(self.m2m_changed_messages, expected_messages)
# 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)
# remove airbag from the self.vw (reverse relation with custom
# related_name)
self.airbag.cars_optional.remove(self.vw)
expected_messages.append({
'instance': self.airbag,
'action': 'pre_remove',
'reverse': True,
'model': Car,
'objects': [self.vw],
})
expected_messages.append({
'instance': self.airbag,
'action': 'post_remove',
'reverse': True,
'model': Car,
'objects': [self.vw],
})
self.assertEqual(self.m2m_changed_messages, expected_messages)
# clear all parts of the self.vw
self.vw.default_parts.clear()
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,
})
self.assertEqual(self.m2m_changed_messages, expected_messages)
# take all the doors off of cars
self.doors.car_set.clear()
expected_messages.append({
'instance': self.doors,
'action': 'pre_clear',
'reverse': True,
'model': Car,
})
expected_messages.append({
'instance': self.doors,
'action': 'post_clear',
'reverse': True,
'model': Car,
})
self.assertEqual(self.m2m_changed_messages, expected_messages)
# take all the airbags off of cars (clear reverse relation with custom
# related_name)
self.airbag.cars_optional.clear()
expected_messages.append({
'instance': self.airbag,
'action': 'pre_clear',
'reverse': True,
'model': Car,
})
expected_messages.append({
'instance': self.airbag,
'action': 'post_clear',
'reverse': True,
'model': Car,
})
self.assertEqual(self.m2m_changed_messages, expected_messages)
# 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
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self.vw.default_parts = [self.wheelset, self.doors, self.engine]
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)
# Check that 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 = [self.doors]
expected_messages.append({
'instance': c4,
'action': 'pre_clear',
'reverse': False,
'model': Part,
})
expected_messages.append({
'instance': c4,
'action': 'post_clear',
'reverse': False,
'model': Part,
})
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 test_m2m_relations_with_self(self):
expected_messages = []
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
)
self.alice.friends = [self.bob, self.chuck]
expected_messages.append({
'instance': self.alice,
'action': 'pre_clear',
'reverse': False,
'model': Person,
})
expected_messages.append({
'instance': self.alice,
'action': 'post_clear',
'reverse': False,
'model': Person,
})
expected_messages.append({
'instance': self.alice,
'action': 'pre_add',
'reverse': False,
'model': Person,
'objects': [self.bob, self.chuck],
})
expected_messages.append({
'instance': self.alice,
'action': 'post_add',
'reverse': False,
'model': Person,
'objects': [self.bob, self.chuck],
})
self.assertEqual(self.m2m_changed_messages, expected_messages)
self.alice.fans = [self.daisy]
expected_messages.append({
'instance': self.alice,
'action': 'pre_clear',
'reverse': False,
'model': Person,
})
expected_messages.append({
'instance': self.alice,
'action': 'post_clear',
'reverse': False,
'model': Person,
})
expected_messages.append({
'instance': self.alice,
'action': 'pre_add',
'reverse': False,
'model': Person,
'objects': [self.daisy],
})
expected_messages.append({
'instance': self.alice,
'action': 'post_add',
'reverse': False,
'model': Person,
'objects': [self.daisy],
})
self.assertEqual(self.m2m_changed_messages, expected_messages)
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self.chuck.idols = [self.alice, self.bob]
expected_messages.append({
'instance': self.chuck,
'action': 'pre_clear',
'reverse': True,
'model': Person,
})
expected_messages.append({
'instance': self.chuck,
'action': 'post_clear',
'reverse': True,
'model': Person,
})
expected_messages.append({
'instance': self.chuck,
'action': 'pre_add',
'reverse': True,
'model': Person,
'objects': [self.alice, self.bob],
})
expected_messages.append({
'instance': self.chuck,
'action': 'post_add',
'reverse': True,
'model': Person,
'objects': [self.alice, self.bob],
})
self.assertEqual(self.m2m_changed_messages, expected_messages)