def METHOD_NAME(self, view_kwargs):
    """
    query method for event sub-topics list
    :param view_kwargs:
    :return:
    """
    query_ = self.session.METHOD_NAME(EventSubTopic)
    if view_kwargs.get('event_topic_id'):
        event_topic = safe_query_kwargs(EventTopic, view_kwargs, 'event_topic_id')
        query_ = query_.join(EventTopic).filter(EventTopic.id == event_topic.id)
    return query_