def METHOD_NAME(self) -> int:
    if self._size is None:
        for key in BUCKET.objects.filter(
                Prefix=self.download_uri.lstrip("/")
        ):
            self._size = key.METHOD_NAME
        if self._size is None:
            raise Exception(
                f"No object found for prefix {self.download_uri}"
            )
    return self._size