为什么 Typescript 中的集合在 Firebase 中更新两次？

Question

 // round page
  newRound() {
    console.log('new round ', this.round);
    this.you.score = +this.score;
    this.round++;
    console.log('THE PLAYERS -> ', this.players);
    this.afStore.collection('matches').doc(this.gameRoom).collection('match').doc(`${this.round}`).set({players: this.players, round: this.round}).then(() => {
      console.log('UPDATED GAME');
    });
    this.router.navigate(['/events/tab2/' + this.gameRoom]);
  }
 // Tab page that goes to the round page
// NOTE: this is for the next page, round 1,2,3,4 etc...
  theRound() {
    this.newRound++;
    console.log('this is the new round ', this.newRound);
    this.afStore.collection('matches').doc(this.gameRoom).collection('match').doc(`${this.newRound}`).set({players: this.players, round: this.newRound});
    this.afStore.collection('matches').doc(this.gameRoom).collection('match').doc(`${this.newRound}`).valueChanges().subscribe((v: any) => {
      this.router.navigate(['/events/tab2/' + this.gameRoom + '/' + v.round]);
      console.log('data returned from firebase ', v);
    });
  }

大家好！我有问题。我正在尝试更新firebase中的特定集合，但它会创建集合，但一旦我在圆形页面中按下一个值，它就不会更新“分数”。它还使用更新的分数创建第二个集合。任何帮助将不胜感激。

Answer 1

好吧，你用set() 更新你的文档，firebase 文档说：

如果文档不存在，则会创建它。如果文档确实存在，则其内容将被新提供的数据覆盖，除非您指定数据应合并到现有文档中

但在更新之前，您对 this.newRound 进行增量，因此您的文档是一个更高的增量，而 firebase 会创建一个新的。