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