def save(self, data, file_id=None, metadata={}):
        pass
Returns True if this field should be used to descend deeper for
dataset/ETHPy150Open Net-ng/kansha/kansha/services/assetsmanager.py/AssetsManager.save--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/models/query_utils.py/select_related_descend