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from __future__ import absolute_import
from django.db import models
from django.test import TestCase
from .models import Author, Book
class SignalsRegressTests(TestCase):
"""
Testing signals before/after saving and deleting.
"""
def get_signal_output(self, fn, *args, **kwargs):
# Flush any existing signal output
self.signal_output = []
fn(*args, **kwargs)
return self.signal_output
def pre_save_test(self, signal, sender, instance, **kwargs):
self.signal_output.append('pre_save signal, %s' % instance)
if kwargs.get('raw'):
self.signal_output.append('Is raw')
def post_save_test(self, signal, sender, instance, **kwargs):
self.signal_output.append('post_save signal, %s' % instance)
if 'created' in kwargs:
if kwargs['created']:
self.signal_output.append('Is created')
else:
self.signal_output.append('Is updated')
if kwargs.get('raw'):
self.signal_output.append('Is raw')
def pre_delete_test(self, signal, sender, instance, **kwargs):
self.signal_output.append('pre_save signal, %s' % instance)
self.signal_output.append('instance.id is not None: %s' % (instance.id != None))
def post_delete_test(self, signal, sender, instance, **kwargs):
self.signal_output.append('post_delete signal, %s' % instance)
self.signal_output.append('instance.id is not None: %s' % (instance.id != None))
def setUp(self):
self.signal_output = []
# 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)
self.pre_signals = (len(models.signals.pre_save.receivers),
len(models.signals.post_save.receivers),
len(models.signals.pre_delete.receivers),
len(models.signals.post_delete.receivers))
models.signals.pre_save.connect(self.pre_save_test)
models.signals.post_save.connect(self.post_save_test)
models.signals.pre_delete.connect(self.pre_delete_test)
models.signals.post_delete.connect(self.post_delete_test)
def tearDown(self):
models.signals.post_delete.disconnect(self.post_delete_test)
models.signals.pre_delete.disconnect(self.pre_delete_test)
models.signals.post_save.disconnect(self.post_save_test)
models.signals.pre_save.disconnect(self.pre_save_test)
# Check that all our signals got disconnected properly.
post_signals = (len(models.signals.pre_save.receivers),
len(models.signals.post_save.receivers),
len(models.signals.pre_delete.receivers),
len(models.signals.post_delete.receivers))
self.assertEqual(self.pre_signals, post_signals)
def test_model_signals(self):
""" Model saves should throw some signals. """
a1 = Author(name='Neal Stephenson')
self.assertEqual(self.get_signal_output(a1.save), [
"pre_save signal, Neal Stephenson",
"post_save signal, Neal Stephenson",
"Is created"
])
b1 = Book(name='Snow Crash')
self.assertEqual(self.get_signal_output(b1.save), [
"pre_save signal, Snow Crash",
"post_save signal, Snow Crash",
"Is created"
])
def test_m2m_signals(self):
""" Assigning and removing to/from m2m shouldn't generate an m2m signal """
b1 = Book(name='Snow Crash')
self.get_signal_output(b1.save)
a1 = Author(name='Neal Stephenson')
self.get_signal_output(a1.save)
self.assertEqual(self.get_signal_output(setattr, b1, 'authors', [a1]), [])
self.assertEqual(self.get_signal_output(setattr, b1, 'authors', []), [])
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