def listener_create(sender, instance, created, **kwargs):
if created:
instance.chunk_set.create(number=1, slug='1')
models.signals.post_save.connect(listener_create, sender=Book)
def listener_create(sender, instance, created, **kwargs):
if created:
instance.chunk_set.create(number=1, slug='1')
models.signals.post_save.connect(listener_create, sender=Book)