def METHOD_NAME(cls, db_file, m="materials", **kwargs):
    """
    Get a MaterialsEhullBuilder using only a db file
    Args:
        db_file: (str) path to db file
        m: (str) name of "materials" collection
        **kwargs: other parameters to feed into the builder, e.g. mapi_key
    """
    db_write = get_database(db_file, admin=True)
    return cls(db_write[m], **kwargs)