What is the best way to fetch all Firebase database IDs using Angular?

Is there a way to fetch all data from Firebase database along with their respective IDs? Currently, I have two functions - getAll() and get(input) that retrieve specific products based on the given ID. However, my current implementation only returns objects from the Firebase database without their corresponding IDs. What changes should be made in order to retrieve all objects with their IDs included?

product.service.ts

import { Injectable } from '@angular/core';
import { AngularFireDatabase } from '@angular/fire/database';
import { Product } from './admin/product-form/product-interface';

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

  constructor(private db: AngularFireDatabase) { }

  create(product){
    return this.db.list('/products').push(product);

  }

  getAll() {
    return this.db.list('/products').valueChanges();


  }

  get(productId){
    return this.db.object('/products/' + productId).valueChanges();
  } 
}

product-form.component.ts

import { Product } from './product-interface';
import { ProductService } from './../../product.service';
import { CategoryService } from './../../category.service';
import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute } from '@angular/router';
import { take } from 'rxjs/operators';

@Component({
  selector: 'app-product-form',
  templateUrl: './product-form.component.html',
  styleUrls: ['./product-form.component.css']
})


export class ProductFormComponent implements OnInit {
  categories$;
  product = {};
  // product:Product;


  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private categoryService: CategoryService, 
    private productService: ProductService) 
    {

    }

   save(product){
     this.productService.create(product);
     this.router.navigate(['/admin/products']);
   }

  ngOnInit(): void {
    this.categories$ = this.categoryService.getCategories();
    let id = this.route.snapshot.paramMap.get('id');
    this.productService.getAll().subscribe((a) => 
    this.product = a);

  }

}


admin-products.component.ts

import { ProductService } from './../../product.service';
import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-admin-products',
  templateUrl: './admin-products.component.html',
  styleUrls: ['./admin-products.component.css']
})
export class AdminProductsComponent implements OnInit {
  products$;
  constructor(private productService: ProductService) {
    this.products$ = this.productService.getAll()
   }

  ngOnInit(): void {
    this.products$.subscribe(p => {
      console.log(p, 'products');
    })
  }

}


admin-products.component.html


<p>
<a routerLink = "/admin/products/new" class="btn btn-primary">New Product</a>
</p>

<table class="table">
    <thead>
        <tr>
            <th>Title</th>
            <th>Price</th>
            <th></th>
        </tr>
    </thead>
    <tbody>
        <tr *ngFor="let p of products$ | async">
            <td>{{ p.title }}</td>
            <td>{{ p.price}}</td>
            <td>
                <a [routerLink]="['/admin/products/', p.$key]">Edit</a>
            </td>
        </tr>
    </tbody>
</table>

Answer №1

By the way, when you are subscribing to observables within components (and not in Angular services), it is important to remember to unsubscribe them in the ngOnDestroy() lifecycle hook. This will help prevent memory leaks and maintain optimal performance in your browser.

Answer №2

For a more comprehensive view, make sure to utilize snapshotChanges() rather than valueChanges(). By using snapshotChanges(), you not only receive the document data but also metadata.

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