使用rxDart合并Firestore流

Question

我试图使用RxDart将Firestore中的两个流合并到一个流中,但它只返回一个流的结果

Stream getData() {
    Stream stream1 = Firestore.instance.collection('test').where('type', isEqualTo: 'type1').snapshots();
    Stream stream2 = Firestore.instance.collection('test').where('type', isEqualTo: 'type2').snapshots();
    return Observable.merge(([stream2, stream1]));
}

Answer 1

根据您的使用情况,您可能不需要RxDart来执行此操作.如果您只想将两个Firestore流合并到一个Dart Stream,则可以StreamZip从dart:async包中使用.

import 'dart:async';     

Stream<List<QuerySnapshot>> getData() {
  Stream stream1 = Firestore.instance.collection('test').where('type', isEqualTo: 'type1').snapshots();
  Stream stream2 = Firestore.instance.collection('test').where('type', isEqualTo: 'type2').snapshots();
  return StreamZip([stream1, stream2]).asBroadcastStream();
}