def on_post_save(self, sender, **kwargs):
        if self._in_migration:
            return
        self.send_notify(
            model=sender,
            obj=kwargs['instance'],
            msg=kwargs['created'] and ADDED or CHANGED,
            using=kwargs['using'],
        )
Preview view requires a POST.
dataset/ETHPy150Open django-ddp/django-ddp/dddp/api.py/DDP.on_post_save--crossover with--dataset/ETHPy150Open caktus/django-scribbler/scribbler/tests/test_views.py/PreviewTestCase.test_post_required