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b7f60045fe
git-svn-id: http://code.djangoproject.com/svn/django/trunk@13773 bcc190cf-cafb-0310-a4f2-bffc1f526a37
152 lines
4.6 KiB
Python
152 lines
4.6 KiB
Python
"""
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Testing signals before/after saving and deleting.
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"""
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from django.db import models
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from django.dispatch import receiver
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class Person(models.Model):
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first_name = models.CharField(max_length=20)
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last_name = models.CharField(max_length=20)
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def __unicode__(self):
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return u"%s %s" % (self.first_name, self.last_name)
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class Car(models.Model):
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make = models.CharField(max_length=20)
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model = models.CharField(max_length=20)
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def __unicode__(self):
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return u"%s %s" % (self.make, self.model)
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def pre_save_test(signal, sender, instance, **kwargs):
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print 'pre_save signal,', instance
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if kwargs.get('raw'):
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print 'Is raw'
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def post_save_test(signal, sender, instance, **kwargs):
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print 'post_save signal,', instance
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if 'created' in kwargs:
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if kwargs['created']:
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print 'Is created'
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else:
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print 'Is updated'
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if kwargs.get('raw'):
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print 'Is raw'
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def pre_delete_test(signal, sender, instance, **kwargs):
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print 'pre_delete signal,', instance
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print 'instance.id is not None: %s' % (instance.id != None)
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# #8285: signals can be any callable
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class PostDeleteHandler(object):
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def __call__(self, signal, sender, instance, **kwargs):
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print 'post_delete signal,', instance
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print 'instance.id is None: %s' % (instance.id == None)
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post_delete_test = PostDeleteHandler()
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__test__ = {'API_TESTS':"""
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# Save up the number of connected signals so that we can check at the end
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# that all the signals we register get properly unregistered (#9989)
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>>> pre_signals = (len(models.signals.pre_save.receivers),
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... len(models.signals.post_save.receivers),
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... len(models.signals.pre_delete.receivers),
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... len(models.signals.post_delete.receivers))
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>>> models.signals.pre_save.connect(pre_save_test)
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>>> models.signals.post_save.connect(post_save_test)
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>>> models.signals.pre_delete.connect(pre_delete_test)
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>>> models.signals.post_delete.connect(post_delete_test)
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# throw a decorator syntax receiver into the mix
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>>> @receiver(models.signals.pre_save)
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... def pre_save_decorator_test(signal, sender, instance, **kwargs):
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... print "pre_save signal decorator,", instance
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# throw a decorator syntax receiver into the mix
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>>> @receiver(models.signals.pre_save, sender=Car)
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... def pre_save_decorator_sender_test(signal, sender, instance, **kwargs):
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... print "pre_save signal decorator sender,", instance
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>>> p1 = Person(first_name='John', last_name='Smith')
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>>> p1.save()
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pre_save signal, John Smith
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pre_save signal decorator, John Smith
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post_save signal, John Smith
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Is created
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>>> p1.first_name = 'Tom'
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>>> p1.save()
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pre_save signal, Tom Smith
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pre_save signal decorator, Tom Smith
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post_save signal, Tom Smith
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Is updated
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# Car signal (sender defined)
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>>> c1 = Car(make="Volkswagon", model="Passat")
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>>> c1.save()
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pre_save signal, Volkswagon Passat
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pre_save signal decorator, Volkswagon Passat
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pre_save signal decorator sender, Volkswagon Passat
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post_save signal, Volkswagon Passat
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Is created
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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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pre_save signal, Tom Smith
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Is raw
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pre_save signal decorator, Tom Smith
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post_save signal, Tom Smith
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Is updated
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Is raw
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>>> p1.delete()
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pre_delete signal, Tom Smith
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instance.id is not None: True
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post_delete signal, Tom Smith
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instance.id is None: False
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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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pre_save signal, James Jones
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pre_save signal decorator, James Jones
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post_save signal, James Jones
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Is created
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>>> p2.id = 99998
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>>> p2.save()
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pre_save signal, James Jones
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pre_save signal decorator, James Jones
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post_save signal, James Jones
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Is created
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>>> p2.delete()
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pre_delete signal, James Jones
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instance.id is not None: True
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post_delete signal, James Jones
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instance.id is None: False
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>>> Person.objects.all()
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[<Person: James Jones>]
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>>> models.signals.post_delete.disconnect(post_delete_test)
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>>> models.signals.pre_delete.disconnect(pre_delete_test)
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>>> models.signals.post_save.disconnect(post_save_test)
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>>> models.signals.pre_save.disconnect(pre_save_test)
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>>> models.signals.pre_save.disconnect(pre_save_decorator_test)
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>>> models.signals.pre_save.disconnect(pre_save_decorator_sender_test, sender=Car)
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# Check that all our signals got disconnected properly.
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>>> post_signals = (len(models.signals.pre_save.receivers),
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... len(models.signals.post_save.receivers),
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... len(models.signals.pre_delete.receivers),
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... len(models.signals.post_delete.receivers))
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>>> pre_signals == post_signals
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True
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"""}
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