@staticmethod
def simple_user_str(user):
    """
        For a user matching output of UserSchema, return 'user_name(id)'
        """
    if not user:
        return '<anonymous>'
    if 'user_name' not in user:
        return '<anonymous>(%s)' % user['id']
    return '%s(%s)' % (user['user_name'], user['id'])
