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"""
Testing signals before/after saving and deleting.
"""
from django.db import models
class Author(models.Model):
name = models.CharField(max_length=20)
def __unicode__(self):
return self.name
class Book(models.Model):
name = models.CharField(max_length=20)
authors = models.ManyToManyField(Author)
def __unicode__(self):
return self.name
def pre_save_test(signal, sender, instance, **kwargs):
print 'pre_save signal,', instance
if kwargs.get('raw'):
print 'Is raw'
def post_save_test(signal, sender, instance, **kwargs):
print 'post_save signal,', instance
if 'created' in kwargs:
if kwargs['created']:
print 'Is created'
else:
print 'Is updated'
if kwargs.get('raw'):
print 'Is raw'
def pre_delete_test(signal, sender, instance, **kwargs):
print 'pre_delete signal,', instance
print 'instance.id is not None: %s' % (instance.id != None)
def post_delete_test(signal, sender, instance, **kwargs):
print 'post_delete signal,', instance
print 'instance.id is not None: %s' % (instance.id != None)
__test__ = {'API_TESTS':"""
# 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(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(pre_save_test)
>>> models.signals.post_save.connect(post_save_test)
>>> models.signals.pre_delete.connect(pre_delete_test)
>>> models.signals.post_delete.connect(post_delete_test)
>>> a1 = Author(name='Neal Stephenson')
>>> a1.save()
pre_save signal, Neal Stephenson
post_save signal, Neal Stephenson
Is created
>>> b1 = Book(name='Snow Crash')
>>> b1.save()
pre_save signal, Snow Crash
post_save signal, Snow Crash
Is created
# Assigning to m2m shouldn't generate an m2m signal
>>> b1.authors = [a1]
# Removing an author from an m2m shouldn't generate an m2m signal
>>> b1.authors = []
>>> models.signals.post_delete.disconnect(post_delete_test)
>>> models.signals.pre_delete.disconnect(pre_delete_test)
>>> models.signals.post_save.disconnect(post_save_test)
>>> models.signals.pre_save.disconnect(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))
>>> pre_signals == post_signals
True
"""}
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