def resolve_query_user(parent, args, context, info):
    """Resolve User information under top level Query.

    Args:
        parent: Result from parent resolver.
        args: field arguments passed in the query.
        context: Per-request state, usually from server.
        info: Introspection about the query itself.

    Returns:
        Something that maps to GraphQL types or that can be
        understood by another resolver.
    """
    return business.load_user_from_login(args["login"])


def resolve_query_user_name(parent, args, context, info):
    assert isinstance(parent, ExpectedBusinessUserClass)
    return f"{parent.firstname} {parent.lastname}"