def expired(self):
        return self.on_site().filter(
            publication_end_date__lte=get_now())
Return the value of a field of the class instantiated according
dataset/ETHPy150Open batiste/django-page-cms/pages/managers.py/PageManager.expired--crossover with--dataset/ETHPy150Open ga4gh/server/ga4gh/avrotools.py/AvroTypeSwitch.getFieldValue