如何使用angular Firestore获取Firestore中的集合ID

npm install @angular/fire firebase --save

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

@Injectable({
  providedIn: 'root'
})
export class FirestoreService {
  private collection: AngularFirestoreCollection<any>;

  constructor(private firestore: AngularFirestore) {
    this.collection = this.firestore.collection('your-collection-name');
  }

  getCollectionId(): Observable<any[]> {
    return this.collection.snapshotChanges().pipe(
      map(actions => {
        return actions.map(a => {
          const data = a.payload.doc.data();
          const id = a.payload.doc.id;
          return { id, ...data };
        });
      })
    );
  }
}

import { Component, OnInit } from '@angular/core';
import { FirestoreService } from 'path-to-your-firestore-service';

@Component({
  selector: 'app-your-component',
  templateUrl: './your-component.component.html',
  styleUrls: ['./your-component.component.css']
})
export class YourComponent implements OnInit {
  collectionId: any[];

  constructor(private firestoreService: FirestoreService) { }

  ngOnInit(): void {
    this.firestoreService.getCollectionId().subscribe(data => {
      this.collectionId = data;
    });
  }
}