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 __init__(self, resolver, proxy_type, key):
        if proxy_type == "file":
            self._method = resolver.get_file_content
        elif proxy_type == "param":
            self._method = resolver.get_parameter_value
        elif proxy_type == "secret":
            self._method = resolver.get_secret_value
        elif proxy_type == "bucket_file":
            self._method = resolver.get_bucket_file
        else:
            raise ValueError("Unknown proxy type %s", proxy_type)
        self._key = key