def METHOD_NAME(self, subject_id):
    """Returns all the entities of assertions for a subject, disregarding
    whether the assertion still is valid or not.
    :param subject_id: The identifier of the subject
    :return: A possibly empty list of entity identifiers
    """
    try:
        return [i["entity_id"] for i in self._cache.find({"subject_id": subject_id})]
    except ValueError:
        return []