如何将firebase文档作为角度对象模型获取

npm install firebase @angular/fire

import { AngularFireModule } from '@angular/fire';
import { AngularFirestoreModule } from '@angular/fire/firestore';

@NgModule({
  imports: [
    AngularFireModule.initializeApp(environment.firebaseConfig),
    AngularFirestoreModule
  ],
  // ...
})
export class AppModule { }

import { Injectable } from '@angular/core';
import { AngularFirestore } from '@angular/fire/firestore';

@Injectable({
  providedIn: 'root'
})
export class FirestoreService {

  constructor(private firestore: AngularFirestore) { }

  // 在这里编写与Firestore交互的方法

}

import { Injectable } from '@angular/core';
import { AngularFirestore } from '@angular/fire/firestore';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class FirestoreService {

  constructor(private firestore: AngularFirestore) { }

  getDocumentData(documentId: string): Observable<any> {
    return this.firestore.collection('collectionName').doc(documentId).valueChanges();
  }

}