如何做飞镖扑火基地查询联接

Question

我有一个用户的Firestore表，以及另一个博客的Firestore表，每个文档上都有uid。我想通过两个表通过其uid来进行联结查询。我找不到在测验状态管理中执行此操作的方法。我想定义一个新的类。

BlogData<T> {
  final Firestore _db = Firestore.instance;
  final String path; 
  CollectionReference ref;
  BlogData({ this.path }) {
    ref = _db.collection(path);
  }
  Future<List<T>> getData() async {
    // get blog data and do a join here to a user document by uid (document/blog.uid) return a future of blogs with user data such as name, country added to each blog in the future list.
  }
  Stream<List<T>> streamData() {
    // get blog data and do a join here to the user document  by uid (document/blog.uid) return a stream of blogs with user data such as name, country added to each blog in the stream.
  }
}

我该如何实现？