如何在angularfire2中将FirebaseObjectObservables添加到FirebaseListObservable的变量中

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

constructor(private firestore: AngularFirestore) { }

addDocumentToList(documentData: any, listPath: string) {
  // 获取集合引用
  const listCollection = this.firestore.collection(listPath);

  // 添加文档到集合
  const documentRef = listCollection.add(documentData);

  // 获取文档ID
  const documentId = documentRef.id;

  // 更新文档引用
  return this.firestore.doc(`${listPath}/${documentId}`).set(documentData, { merge: true });
}

const documentData = {
  name: 'John Doe',
  age: 30,
  email: 'john.doe@example.com'
};

const listPath = 'users';

this.addDocumentToList(documentData, listPath).then(() => {
  console.log('Document added to list');
}).catch((error) => {
  console.error('Error adding document to list:', error);
});