使用Ionic获取Firebase中唯一项Id的引用路径

import { Injectable } from '@angular/core';
import { AngularFireDatabase } from '@angular/fire/database';

@Injectable({
  providedIn: 'root'
})
export class FirebaseService {
  constructor(private db: AngularFireDatabase) {}
}

import { Injectable } from '@angular/core';
import { AngularFireDatabase } from '@angular/fire/database';

@Injectable({
  providedIn: 'root'
})
export class FirebaseService {
  constructor(private db: AngularFireDatabase) {}

  getItemById(itemId: string) {
    return this.db.list('items').snapshotChanges().pipe(
      map(changes =>
        changes.map(c => ({ key: c.payload.key, ...c.payload.val() }))
      ),
      map(items =>
        items.find(item => item.key === itemId)
      )
    );
  }
}

import { Component } from '@angular/core';
import { FirebaseService } from '../services/firebase.service';

@Component({
  selector: 'app-item',
  templateUrl: './item.component.html',
  styleUrls: ['./item.component.scss'],
})
export class ItemComponent {
  item: any;

  constructor(private firebaseService: FirebaseService) {}

  getItemById(itemId: string) {
    this.firebaseService.getItemById(itemId).subscribe(item => {
      this.item = item;
      console.log(this.item);
    });
  }
}