def delete(self, doc):
        if doc.id is None:
            raise DatabaseException('Document does not have id')
        if doc.sid is None:
            try:
                rs = self.db.docs.remove({'id': doc.id}, safe=True)
                assert rs['n'] == 1
            except Exception as e:
                raise DatabaseException(e)
            return None
        doc.data = None
        return self.update(doc)
def app_settings():

    app_settings = {'GRAPHITE_HOST': settings.GRAPHITE_HOST,
                    'OCULUS_HOST': settings.OCULUS_HOST,
                    'FULL_NAMESPACE': settings.FULL_NAMESPACE,
                    }

    resp = json.dumps(app_settings)
    return resp, 200