我想查询id文档（firestore）并在ionic4 App中检索它的数据

Question

嗨，我的朋友们我想从Firestore查询文件ID到我的ionic4应用 我可以将文档的ID传递到详细信息页面，而我又不知道如何查询文档的数据。 我的数据库

My database

我尝试过此代码： news.page.html

<ion-content padding>
            <ion-item *ngFor=" let count of news | async">
              <h5>{{count.title}}<ion-button routerLink="/details/{{count.id}}"> details</ion-button>

                <img src="{{count.image}}">
              </h5>

            </ion-item>

    </ion-content>

news.page.ts

news: Observable<any[]>;
  constructor(public db: AngularFirestore, private router: Router) { }

  ngOnInit() {
      this.news = this.db.collection('123').snapshotChanges().map(actions => {
      return actions.map(a => {
        const data = a.payload.doc.data();
        const id = a.payload.doc.id;
        return { id, ...data };
      });
    });
}

details.page.html

<ion-content padding >
  {{id}}


</ion-content>

details.pge.ts

export class DetailsPage implements OnInit {
  id: string;

  constructor(private router: ActivatedRoute, private afs: AngularFirestore) {

   }

  ngOnInit() {
    this.id = this.router.snapshot.paramMap.get('id');
    console.log(this.id);
  }

}