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from __future__ import absolute_import
from django.db.models import signals
from django.dispatch import receiver
from django.test import TestCase
from django.utils import six
from .models import Person, Car
# #8285: signals can be any callable
class PostDeleteHandler(object):
def __init__(self, data):
self.data = data
def __call__(self, signal, sender, instance, **kwargs):
self.data.append(
(instance, instance.id is None)
)
class MyReceiver(object):
def __init__(self, param):
self.param = param
self._run = False
def __call__(self, signal, sender, **kwargs):
self._run = True
signal.disconnect(receiver=self, sender=sender)
class SignalTests(TestCase):
def test_basic(self):
# Save up the number of connected signals so that we can check at the
# end that all the signals we register get properly unregistered (#9989)
pre_signals = (
len(signals.pre_save.receivers),
len(signals.post_save.receivers),
len(signals.pre_delete.receivers),
len(signals.post_delete.receivers),
)
data = []
def pre_save_test(signal, sender, instance, **kwargs):
data.append(
(instance, kwargs.get("raw", False))
)
signals.pre_save.connect(pre_save_test)
def post_save_test(signal, sender, instance, **kwargs):
data.append(
(instance, kwargs.get("created"), kwargs.get("raw", False))
)
signals.post_save.connect(post_save_test)
def pre_delete_test(signal, sender, instance, **kwargs):
data.append(
(instance, instance.id is None)
)
signals.pre_delete.connect(pre_delete_test)
post_delete_test = PostDeleteHandler(data)
signals.post_delete.connect(post_delete_test)
# throw a decorator syntax receiver into the mix
@receiver(signals.pre_save)
def pre_save_decorator_test(signal, sender, instance, **kwargs):
data.append(instance)
@receiver(signals.pre_save, sender=Car)
def pre_save_decorator_sender_test(signal, sender, instance, **kwargs):
data.append(instance)
p1 = Person(first_name="John", last_name="Smith")
self.assertEqual(data, [])
p1.save()
self.assertEqual(data, [
(p1, False),
p1,
(p1, True, False),
])
data[:] = []
p1.first_name = "Tom"
p1.save()
self.assertEqual(data, [
(p1, False),
p1,
(p1, False, False),
])
data[:] = []
# Car signal (sender defined)
c1 = Car(make="Volkswagon", model="Passat")
c1.save()
self.assertEqual(data, [
(c1, False),
c1,
c1,
(c1, True, False),
])
data[:] = []
# Calling an internal method purely so that we can trigger a "raw" save.
p1.save_base(raw=True)
self.assertEqual(data, [
(p1, True),
p1,
(p1, False, True),
])
data[:] = []
p1.delete()
self.assertEqual(data, [
(p1, False),
(p1, False),
])
data[:] = []
p2 = Person(first_name="James", last_name="Jones")
p2.id = 99999
p2.save()
self.assertEqual(data, [
(p2, False),
p2,
(p2, True, False),
])
data[:] = []
p2.id = 99998
p2.save()
self.assertEqual(data, [
(p2, False),
p2,
(p2, True, False),
])
data[:] = []
p2.delete()
self.assertEqual(data, [
(p2, False),
(p2, False)
])
self.assertQuerysetEqual(
Person.objects.all(), [
"James Jones",
],
six.text_type
)
signals.post_delete.disconnect(post_delete_test)
signals.pre_delete.disconnect(pre_delete_test)
signals.post_save.disconnect(post_save_test)
signals.pre_save.disconnect(pre_save_test)
signals.pre_save.disconnect(pre_save_decorator_test)
signals.pre_save.disconnect(pre_save_decorator_sender_test, sender=Car)
# Check that all our signals got disconnected properly.
post_signals = (
len(signals.pre_save.receivers),
len(signals.post_save.receivers),
len(signals.pre_delete.receivers),
len(signals.post_delete.receivers),
)
self.assertEqual(pre_signals, post_signals)
def test_disconnect_in_dispatch(self):
"""
Test that signals that disconnect when being called don't mess future
dispatching.
"""
a, b = MyReceiver(1), MyReceiver(2)
signals.post_save.connect(sender=Person, receiver=a)
signals.post_save.connect(sender=Person, receiver=b)
p = Person.objects.create(first_name='John', last_name='Smith')
self.assertTrue(a._run)
self.assertTrue(b._run)
self.assertEqual(signals.post_save.receivers, [])
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