我在“用户”集合中有以下文档{"_id":"388179687996974","matches":[{"userId":"1495728740672094","choice":false,"dates":[],"dateId":null},{"userId":"385516561596016","choice":true,"dates":[],"dateId":"2014-11-26_385516561596016_388179687996974"},{"userId":"253752728167114","choice":false,"dates":[],"dateId":null}