410 lines
14 KiB
Python
410 lines
14 KiB
Python
from unittest import mock
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from django.apps.registry import Apps
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from django.db import models
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from django.db.models import signals
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from django.dispatch import receiver
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from django.test import SimpleTestCase, TestCase
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from django.test.utils import isolate_apps
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from .models import Author, Book, Car, Person
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class BaseSignalSetup:
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def setUp(self):
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# Save up the number of connected signals so that we can check at the
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# end that all the signals we register get properly unregistered (#9989)
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self.pre_signals = (
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len(signals.pre_save.receivers),
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len(signals.post_save.receivers),
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len(signals.pre_delete.receivers),
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len(signals.post_delete.receivers),
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)
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def tearDown(self):
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# All our signals got disconnected properly.
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post_signals = (
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len(signals.pre_save.receivers),
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len(signals.post_save.receivers),
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len(signals.pre_delete.receivers),
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len(signals.post_delete.receivers),
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)
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self.assertEqual(self.pre_signals, post_signals)
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class SignalTests(BaseSignalSetup, TestCase):
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def test_model_pre_init_and_post_init(self):
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data = []
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def pre_init_callback(sender, args, **kwargs):
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data.append(kwargs['kwargs'])
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signals.pre_init.connect(pre_init_callback)
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def post_init_callback(sender, instance, **kwargs):
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data.append(instance)
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signals.post_init.connect(post_init_callback)
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p1 = Person(first_name="John", last_name="Doe")
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self.assertEqual(data, [{}, p1])
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def test_save_signals(self):
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data = []
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def pre_save_handler(signal, sender, instance, **kwargs):
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data.append(
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(instance, sender, kwargs.get("raw", False))
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)
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def post_save_handler(signal, sender, instance, **kwargs):
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data.append(
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(instance, sender, kwargs.get("created"), kwargs.get("raw", False))
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)
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signals.pre_save.connect(pre_save_handler, weak=False)
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signals.post_save.connect(post_save_handler, weak=False)
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try:
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p1 = Person.objects.create(first_name="John", last_name="Smith")
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self.assertEqual(data, [
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(p1, Person, False),
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(p1, Person, True, False),
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])
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data[:] = []
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p1.first_name = "Tom"
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p1.save()
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self.assertEqual(data, [
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(p1, Person, False),
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(p1, Person, False, False),
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])
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data[:] = []
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# Calling an internal method purely so that we can trigger a "raw" save.
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p1.save_base(raw=True)
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self.assertEqual(data, [
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(p1, Person, True),
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(p1, Person, False, True),
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])
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data[:] = []
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p2 = Person(first_name="James", last_name="Jones")
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p2.id = 99999
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p2.save()
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self.assertEqual(data, [
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(p2, Person, False),
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(p2, Person, True, False),
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])
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data[:] = []
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p2.id = 99998
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p2.save()
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self.assertEqual(data, [
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(p2, Person, False),
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(p2, Person, True, False),
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])
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# The sender should stay the same when using defer().
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data[:] = []
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p3 = Person.objects.defer('first_name').get(pk=p1.pk)
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p3.last_name = 'Reese'
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p3.save()
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self.assertEqual(data, [
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(p3, Person, False),
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(p3, Person, False, False),
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])
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finally:
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signals.pre_save.disconnect(pre_save_handler)
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signals.post_save.disconnect(post_save_handler)
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def test_delete_signals(self):
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data = []
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def pre_delete_handler(signal, sender, instance, **kwargs):
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data.append(
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(instance, sender, instance.id is None)
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)
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# #8285: signals can be any callable
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class PostDeleteHandler:
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def __init__(self, data):
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self.data = data
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def __call__(self, signal, sender, instance, **kwargs):
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self.data.append(
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(instance, sender, instance.id is None)
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)
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post_delete_handler = PostDeleteHandler(data)
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signals.pre_delete.connect(pre_delete_handler, weak=False)
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signals.post_delete.connect(post_delete_handler, weak=False)
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try:
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p1 = Person.objects.create(first_name="John", last_name="Smith")
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p1.delete()
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self.assertEqual(data, [
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(p1, Person, False),
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(p1, Person, False),
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])
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data[:] = []
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p2 = Person(first_name="James", last_name="Jones")
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p2.id = 99999
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p2.save()
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p2.id = 99998
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p2.save()
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p2.delete()
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self.assertEqual(data, [
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(p2, Person, False),
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(p2, Person, False),
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])
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data[:] = []
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self.assertQuerysetEqual(
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Person.objects.all(), [
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"James Jones",
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],
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str
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)
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finally:
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signals.pre_delete.disconnect(pre_delete_handler)
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signals.post_delete.disconnect(post_delete_handler)
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def test_decorators(self):
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data = []
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@receiver(signals.pre_save, weak=False)
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def decorated_handler(signal, sender, instance, **kwargs):
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data.append(instance)
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@receiver(signals.pre_save, sender=Car, weak=False)
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def decorated_handler_with_sender_arg(signal, sender, instance, **kwargs):
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data.append(instance)
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try:
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c1 = Car.objects.create(make="Volkswagen", model="Passat")
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self.assertEqual(data, [c1, c1])
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finally:
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signals.pre_save.disconnect(decorated_handler)
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signals.pre_save.disconnect(decorated_handler_with_sender_arg, sender=Car)
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def test_save_and_delete_signals_with_m2m(self):
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data = []
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def pre_save_handler(signal, sender, instance, **kwargs):
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data.append('pre_save signal, %s' % instance)
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if kwargs.get('raw'):
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data.append('Is raw')
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def post_save_handler(signal, sender, instance, **kwargs):
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data.append('post_save signal, %s' % instance)
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if 'created' in kwargs:
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if kwargs['created']:
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data.append('Is created')
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else:
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data.append('Is updated')
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if kwargs.get('raw'):
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data.append('Is raw')
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def pre_delete_handler(signal, sender, instance, **kwargs):
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data.append('pre_delete signal, %s' % instance)
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data.append('instance.id is not None: %s' % (instance.id is not None))
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def post_delete_handler(signal, sender, instance, **kwargs):
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data.append('post_delete signal, %s' % instance)
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data.append('instance.id is not None: %s' % (instance.id is not None))
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signals.pre_save.connect(pre_save_handler, weak=False)
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signals.post_save.connect(post_save_handler, weak=False)
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signals.pre_delete.connect(pre_delete_handler, weak=False)
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signals.post_delete.connect(post_delete_handler, weak=False)
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try:
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a1 = Author.objects.create(name='Neal Stephenson')
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self.assertEqual(data, [
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"pre_save signal, Neal Stephenson",
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"post_save signal, Neal Stephenson",
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"Is created"
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])
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data[:] = []
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b1 = Book.objects.create(name='Snow Crash')
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self.assertEqual(data, [
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"pre_save signal, Snow Crash",
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"post_save signal, Snow Crash",
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"Is created"
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])
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data[:] = []
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# Assigning and removing to/from m2m shouldn't generate an m2m signal.
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b1.authors.set([a1])
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self.assertEqual(data, [])
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b1.authors.set([])
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self.assertEqual(data, [])
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finally:
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signals.pre_save.disconnect(pre_save_handler)
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signals.post_save.disconnect(post_save_handler)
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signals.pre_delete.disconnect(pre_delete_handler)
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signals.post_delete.disconnect(post_delete_handler)
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def test_disconnect_in_dispatch(self):
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"""
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Signals that disconnect when being called don't mess future
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dispatching.
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"""
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class Handler:
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def __init__(self, param):
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self.param = param
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self._run = False
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def __call__(self, signal, sender, **kwargs):
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self._run = True
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signal.disconnect(receiver=self, sender=sender)
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a, b = Handler(1), Handler(2)
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signals.post_save.connect(a, sender=Person, weak=False)
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signals.post_save.connect(b, sender=Person, weak=False)
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Person.objects.create(first_name='John', last_name='Smith')
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self.assertTrue(a._run)
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self.assertTrue(b._run)
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self.assertEqual(signals.post_save.receivers, [])
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@mock.patch('weakref.ref')
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def test_lazy_model_signal(self, ref):
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def callback(sender, args, **kwargs):
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pass
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signals.pre_init.connect(callback)
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signals.pre_init.disconnect(callback)
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self.assertTrue(ref.called)
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ref.reset_mock()
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signals.pre_init.connect(callback, weak=False)
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signals.pre_init.disconnect(callback)
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ref.assert_not_called()
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@isolate_apps('signals', kwarg_name='apps')
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def test_disconnect_model(self, apps):
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received = []
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def receiver(**kwargs):
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received.append(kwargs)
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class Created(models.Model):
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pass
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signals.post_init.connect(receiver, sender=Created, apps=apps)
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try:
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self.assertIs(
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signals.post_init.disconnect(receiver, sender=Created, apps=apps),
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True,
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)
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self.assertIs(
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signals.post_init.disconnect(receiver, sender=Created, apps=apps),
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False,
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)
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Created()
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self.assertEqual(received, [])
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finally:
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signals.post_init.disconnect(receiver, sender=Created)
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class LazyModelRefTests(BaseSignalSetup, SimpleTestCase):
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def setUp(self):
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super().setUp()
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self.received = []
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def receiver(self, **kwargs):
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self.received.append(kwargs)
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def test_invalid_sender_model_name(self):
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msg = "Invalid model reference 'invalid'. String model references must be of the form 'app_label.ModelName'."
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with self.assertRaisesMessage(ValueError, msg):
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signals.post_init.connect(self.receiver, sender='invalid')
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def test_already_loaded_model(self):
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signals.post_init.connect(
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self.receiver, sender='signals.Book', weak=False
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)
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try:
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instance = Book()
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self.assertEqual(self.received, [{
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'signal': signals.post_init,
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'sender': Book,
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'instance': instance
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}])
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finally:
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signals.post_init.disconnect(self.receiver, sender=Book)
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@isolate_apps('signals', kwarg_name='apps')
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def test_not_loaded_model(self, apps):
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signals.post_init.connect(
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self.receiver, sender='signals.Created', weak=False, apps=apps
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)
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try:
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class Created(models.Model):
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pass
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instance = Created()
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self.assertEqual(self.received, [{
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'signal': signals.post_init, 'sender': Created, 'instance': instance
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}])
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finally:
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signals.post_init.disconnect(self.receiver, sender=Created)
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@isolate_apps('signals', kwarg_name='apps')
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def test_disconnect_registered_model(self, apps):
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received = []
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def receiver(**kwargs):
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received.append(kwargs)
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class Created(models.Model):
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pass
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signals.post_init.connect(receiver, sender='signals.Created', apps=apps)
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try:
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self.assertIsNone(
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signals.post_init.disconnect(receiver, sender='signals.Created', apps=apps)
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)
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self.assertIsNone(
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signals.post_init.disconnect(receiver, sender='signals.Created', apps=apps)
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)
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Created()
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self.assertEqual(received, [])
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finally:
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signals.post_init.disconnect(receiver, sender='signals.Created')
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@isolate_apps('signals', kwarg_name='apps')
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def test_disconnect_unregistered_model(self, apps):
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received = []
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def receiver(**kwargs):
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received.append(kwargs)
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signals.post_init.connect(receiver, sender='signals.Created', apps=apps)
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try:
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self.assertIsNone(
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signals.post_init.disconnect(receiver, sender='signals.Created', apps=apps)
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)
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self.assertIsNone(
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signals.post_init.disconnect(receiver, sender='signals.Created', apps=apps)
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)
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class Created(models.Model):
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pass
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Created()
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self.assertEqual(received, [])
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finally:
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signals.post_init.disconnect(receiver, sender='signals.Created')
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def test_register_model_class_senders_immediately(self):
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"""
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Model signals registered with model classes as senders don't use the
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Apps.lazy_model_operation() mechanism.
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"""
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# Book isn't registered with apps2, so it will linger in
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# apps2._pending_operations if ModelSignal does the wrong thing.
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apps2 = Apps()
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signals.post_init.connect(self.receiver, sender=Book, apps=apps2)
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self.assertEqual(list(apps2._pending_operations), [])
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