@classmethod
def get_parent_assets(cls, session, asset_key):
    """Get information about parent assets

        Args:
            session: database session
            asset_key(int): key of the *child asset
        Returns:
            list: parent assets (powering child)
        """
    results = session.run(
        'MATCH (:Asset { key: $key })-[:POWERED_BY]->(asset:Asset) RETURN asset'
        , key=int(asset_key))
    assets = list(map(lambda x: dict(x['asset']), list(results)))
    return assets
