Angular 13 Firebase CRUD with Realtime Database | AngularFireDatabase

In this tutorial, I will show you how to build Angular 13 Firebase example: CRUD App with Realtime Database that uses AngularFireDatabase service.

Other versions:
– Angular 10 Firebase CRUD example
– Angular 11 Firebase CRUD example
– Angular 12 Firebase CRUD example
– Angular 14 Firebase CRUD example
– Angular 15 Firebase CRUD example
– Angular 16 Firebase CRUD example

Related Posts:
– Angular Firestore CRUD example
– Angular Firebase Storage: File Upload/Display/Delete Files example
– Angular CRUD Application with Rest API
– Angular Form Validation example (Reactive Forms)

Angular 13 Firebase CRUD Overview

We’re gonna build an Angular 13 Firebase App using @angular/fire library in which:

• Each Tutorial has key, title, description, published status.
• We can make CRUD operations: create, retrieve, update, delete Tutorials.

Here are the screenshots:

– Create a new Tutorial:

Firebase Realtime Database right after the Operation:

If you want to add Form validation, please visit:
Angular Form Validation example (Reactive Forms)

– Retrieve all Tutorials with details when clicking on a Tutorial:

– Change status to Published/Pending using Publish/UnPublish button:

– Update the Tutorial details with Update button:

– Delete the Tutorial using Delete button:

– Delete all Tutorials with Remove All button:

AngularFireDatabase service

@angular/fire provides AngularFireDatabase service that allows us to work with the Realtime Database. It’s an efficient, low-latency solution for apps that require synced states across clients in realtime.

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

export class TutorialService {
  constructor(private db: AngularFireDatabase) { }
}

AngularFireDatabase for Object

The AngularFireObject is a service for manipulating and streaming object data which is created via AngularFireDatabase service.

– Create an object binding/ Retrieve:

tutorial: AngularFireObject<any>;
// db: AngularFireDatabase
this.tutorial = db.object('tutorial');
 
// or
Observable<any> tutorial = db.object('tutorial').valueChanges();

– Create/Update an object:

const tutRef = db.object('tutorial');
 
// set() for destructive updates
tutRef.set({ title: 'zkoder Tutorial'});

– Update an object:

const tutRef= db.object('tutorial');
tutRef.update({ url: 'bezkoder.com/zkoder-tutorial' });

– Delete an object:

const tutRef = db.object('tutorial');
tutRef.remove();

AngularFireDatabase for List

Through the AngularFireDatabase service, we can create AngularFireList service that helps to synchronize data as lists.

– Create a list binding/ Retrieve:
+ Get an Observable of data as a synchronized array of JSON objects without snapshot metadata.

tutorials: Observable<any[]>;
// db: AngularFireDatabase
this.tutorials = db.list('tutorials').valueChanges();

+ Get an Observable of data as a synchronized array of AngularFireAction<DatabaseSnapshot>[] with metadata (the underyling DatabaseReference and snapshot key):

tutorials: Observable<any[]>;
this.tutorials = db.list('tutorials').snapshotChanges();

– Create a List and push a new object:

const tutorialsRef = db.list('tutorials');
tutorialsRef.push({ title: 'zkoder Tutorial', url: 'bezkoder.com/zkoder-tutorial' });

– Update a List:
+ destructive update using set(): delete everything currently in place, then save the new value

const tutorialsRef = db.list('tutorials');
tutorialsRef.set('key', { title: 'zkoder Tut#1', url: 'bezkoder.com/zkoder-tut-1' });

+ non-destructive update using update(): only updates the specified values

const tutorialsRef = db.list('tutorials');
tutorialsRef.update('key', { title: 'zkoder new Tut#1' });

– Delete an object in List:

const tutorialsRef = db.list('tutorials');
tutorialsRef.remove('key');

– Delete entire List:

const tutorialsRef = db.list('tutorials');
tutorialsRef.remove();

Technology

• Angular 13
• firebase 8
• @angular/fire 6
• rxjs 7

Setup the Firebase Project

Go to Firebase Console, login with your Google Account, then click on Add Project.

You will see the window like this:

Enter Project name, set Project Id and click on Continue.
Turn off Enable Google Analytics for this project, then click Create Project.

Now, browser turns into following view:

If you don’t see it, just choose Project Overview.
Click on Web App, you will see:

Set the nickname and choose Register App for next step.

Save the information for later usage.

Choose Database in the left (list of Firebase features) -> Realtime Database -> Create Database.

In this tutorial, we don’t implement Authentication, so let’s choose test mode:

Or if you come from another situation, just open Tab Rules, then change .read and .write values to true.

Setup Angular 13 Project

Let’s open cmd and use Angular CLI to create a new Angular Project as following command:

ng new Angular13FirebaseCrud
? Would you like to add Angular routing? Yes
? Which stylesheet format would you like to use? CSS

Open index.html, in <head> tag, import Bootstrap 4 to this project:

<!doctype html>
<html lang="en">
<head>
  ...
  <link rel="stylesheet" href="//unpkg.com/[email protected]/dist/css/bootstrap.min.css" />
</head>
<body>
  <app-root></app-root>
</body>
</html>

We also need to generate some Components and Services:

ng g s services/tutorial

ng g c components/add-tutorial
ng g c components/tutorial-details
ng g c components/tutorials-list

ng g class models/tutorial --type=model

Now you can see that our project directory structure looks like this.

Project Structure

Let me explain it briefly.

– environment.ts configures information to connect with Firebase Project.
– models/tutorial.model.ts defines data model class.
– services/tutorial.service.ts exports TutorialService that uses @angular/fire‘s AngularFireDatabase to interact with Firebase Database.
– There are 3 components that uses TutorialService:

• add-tutorial for creating new item
• tutorials-list contains list of items, parent of tutorial-details
• tutorial-details shows item details

– app-routing.module.ts defines routes for each component.
– app.component contains router view and navigation bar.
– app.module.ts declares Angular components and imports necessary environment & modules.

Integrate Firebase into Angular 13 App

First run the command: npm install [email protected] @angular/[email protected].

Open src/environments/environment.ts, add Firebase configuration that we have saved when Popup window was shown:

export const environment = {
  production: false,
  firebase: {
    apiKey: 'xxx',
    authDomain: 'bezkoder-firebase.firebaseapp.com',
    databaseURL: 'https://bezkoder-firebase.firebaseio.com',
    projectId: 'bezkoder-firebase',
    storageBucket: 'bezkoder-firebase.appspot.com',
    messagingSenderId: 'xxx',
    appId: 'xxx'
  }
};

Open app.module.ts, import AngularFireModule, AngularFireDatabaseModule and environment:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';

import { AngularFireModule } from '@angular/fire';
import { AngularFireDatabaseModule } from '@angular/fire/database';
import { environment } from '../environments/environment';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { AddTutorialComponent } from './components/add-tutorial/add-tutorial.component';
import { TutorialDetailsComponent } from './components/tutorial-details/tutorial-details.component';
import { TutorialsListComponent } from './components/tutorials-list/tutorials-list.component';

@NgModule({
  declarations: [
    AppComponent,
    AddTutorialComponent,
    TutorialDetailsComponent,
    TutorialsListComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    FormsModule,
    AngularFireModule.initializeApp(environment.firebase),
    AngularFireDatabaseModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Define Model Class

Let’s create Tutorial class with 4 fields: key, title, description, published.

models/tutorial.model.ts

export class Tutorial {
  key?: string | null;
  title?: string;
  description?: string;
  published?: boolean;
}

Create Data Service

This service will use AngularFireDatabase and AngularFireList to interact with Firebase Realtime Database. It contains necessary functions for CRUD operations.

services/tutorial.service.ts

import { Injectable } from '@angular/core';
import { AngularFireDatabase, AngularFireList } from '@angular/fire/database';
import { Tutorial } from '../models/tutorial.model';

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

  private dbPath = '/tutorials';

  tutorialsRef: AngularFireList<Tutorial>;

  constructor(private db: AngularFireDatabase) {
    this.tutorialsRef = db.list(this.dbPath);
  }

  getAll(): AngularFireList<Tutorial> {
    return this.tutorialsRef;
  }

  create(tutorial: Tutorial): any {
    return this.tutorialsRef.push(tutorial);
  }

  update(key: string, value: any): Promise<void> {
    return this.tutorialsRef.update(key, value);
  }

  delete(key: string): Promise<void> {
    return this.tutorialsRef.remove(key);
  }

  deleteAll(): Promise<void> {
    return this.tutorialsRef.remove();
  }
}

Component for creating Object

his component has a Form to submit new Tutorial with 2 fields: title & description. It calls TutorialService.create() method.

components/add-tutorial/add-tutorial.component.ts

import { Component, OnInit } from '@angular/core';
import { Tutorial } from 'src/app/models/tutorial.model';
import { TutorialService } from 'src/app/services/tutorial.service';

@Component({
  selector: 'app-add-tutorial',
  templateUrl: './add-tutorial.component.html',
  styleUrls: ['./add-tutorial.component.css']
})
export class AddTutorialComponent implements OnInit {

  tutorial: Tutorial = new Tutorial();
  submitted = false;

  constructor(private tutorialService: TutorialService) { }

  ngOnInit(): void {
  }

  saveTutorial(): void {
    this.tutorialService.create(this.tutorial).then(() => {
      console.log('Created new item successfully!');
      this.submitted = true;
    });
  }

  newTutorial(): void {
    this.submitted = false;
    this.tutorial = new Tutorial();
  }

}

components/add-tutorial/add-tutorial.component.html

<div class="submit-form">
  <div *ngIf="!submitted">
    <div class="form-group">
      <label for="title">Title</label>
      <input
        type="text"
        class="form-control"
        id="title"
        required
        [(ngModel)]="tutorial.title"
        name="title"
      />
    </div>

    <div class="form-group">
      <label for="description">Description</label>
      <input
        class="form-control"
        id="description"
        required
        [(ngModel)]="tutorial.description"
        name="description"
      />
    </div>

    <button (click)="saveTutorial()" class="btn btn-success">Submit</button>
  </div>

  <div *ngIf="submitted">
    <h4>You submitted successfully!</h4>
    <button class="btn btn-success" (click)="newTutorial()">Add</button>
  </div>
</div>

Component for List of Objects

This component calls TutorialService methods:

• getAll()
• deleteAll()

components/tutorials-list/tutorials-list.component.ts

import { Component, OnInit } from '@angular/core';
import { TutorialService } from 'src/app/services/tutorial.service';
import { Tutorial } from 'src/app/models/tutorial.model';
import { map } from 'rxjs/operators';

@Component({
  selector: 'app-tutorials-list',
  templateUrl: './tutorials-list.component.html',
  styleUrls: ['./tutorials-list.component.css']
})
export class TutorialsListComponent implements OnInit {

  tutorials?: Tutorial[];
  currentTutorial?: Tutorial;
  currentIndex = -1;
  title = '';

  constructor(private tutorialService: TutorialService) { }

  ngOnInit(): void {
    this.retrieveTutorials();
  }

  refreshList(): void {
    this.currentTutorial = undefined;
    this.currentIndex = -1;
    this.retrieveTutorials();
  }

  retrieveTutorials(): void {
    this.tutorialService.getAll().snapshotChanges().pipe(
      map(changes =>
        changes.map(c =>
          ({ key: c.payload.key, ...c.payload.val() })
        )
      )
    ).subscribe(data => {
      this.tutorials = data;
    });
  }

  setActiveTutorial(tutorial: Tutorial, index: number): void {
    this.currentTutorial = tutorial;
    this.currentIndex = index;
  }

  removeAllTutorials(): void {
    this.tutorialService.deleteAll()
      .then(() => this.refreshList())
      .catch(err => console.log(err));
  }

}

In the code above, to get the key of each item, we use snapshotChanges() with RxJS map() operator. This key is unique and important for update operation.

We also have refreshList() function for every time delete operation is done.

components/tutorials-list/tutorials-list.component.html

<div class="list row">
  <div class="col-md-6">
    <h4>Tutorials List</h4>
    <ul class="list-group">
      <li
        class="list-group-item"
        *ngFor="let tutorial of tutorials; let i = index"
        [class.active]="i == currentIndex"
        (click)="setActiveTutorial(tutorial, i)"
      >
        {{ tutorial.title }}
      </li>
    </ul>

    <button class="m-3 btn btn-sm btn-danger" (click)="removeAllTutorials()">
      Remove All
    </button>
  </div>
  <div class="col-md-6">
    <div *ngIf="currentTutorial">
      <app-tutorial-details
        (refreshList)="refreshList()"
        [tutorial]="currentTutorial"
      ></app-tutorial-details>
    </div>

    <div *ngIf="!currentTutorial">
      <br />
      <p>Please click on a Tutorial...</p>
    </div>
  </div>
</div>

You can see that when we click on any item, setActiveTutorial() function will be invoked to change current active Tutorial, which data is passed to tutorial-details component.

Component for Object details

This component is the child of tutorial-list. It bind tutorial data and emit refreshList event to the parent.

For getting update, delete the Tutorial, we’re gonna use two TutorialService methods:

• update()
• delete()

components/tutorial-details/tutorial-details.component.ts

import { Component, OnInit, Input, OnChanges, Output, EventEmitter } from '@angular/core';
import { Tutorial } from 'src/app/models/tutorial.model';
import { TutorialService } from 'src/app/services/tutorial.service';

@Component({
  selector: 'app-tutorial-details',
  templateUrl: './tutorial-details.component.html',
  styleUrls: ['./tutorial-details.component.css']
})
export class TutorialDetailsComponent implements OnInit {

  @Input() tutorial?: Tutorial;
  @Output() refreshList: EventEmitter<any> = new EventEmitter();
  currentTutorial: Tutorial = {
    title: '',
    description: '',
    published: false
  };
  message = '';

  constructor(private tutorialService: TutorialService) { }

  ngOnInit(): void {
    this.message = '';
  }

  ngOnChanges(): void {
    this.message = '';
    this.currentTutorial = { ...this.tutorial };
  }

  updatePublished(status: boolean): void {
    if (this.currentTutorial.key) {
      this.tutorialService.update(this.currentTutorial.key, { published: status })
      .then(() => {
        this.currentTutorial.published = status;
        this.message = 'The status was updated successfully!';
      })
      .catch(err => console.log(err));
    }
  }

  updateTutorial(): void {
    const data = {
      title: this.currentTutorial.title,
      description: this.currentTutorial.description
    };

    if (this.currentTutorial.key) {
      this.tutorialService.update(this.currentTutorial.key, data)
        .then(() => this.message = 'The tutorial was updated successfully!')
        .catch(err => console.log(err));
    }
  }

  deleteTutorial(): void {
    if (this.currentTutorial.key) {
      this.tutorialService.delete(this.currentTutorial.key)
        .then(() => {
          this.refreshList.emit();
          this.message = 'The tutorial was updated successfully!';
        })
        .catch(err => console.log(err));
    }
  }

}

components/tutorial-details/tutorial-details.component.html

<div *ngIf="currentTutorial" class="edit-form">
  <h4>Tutorial</h4>
  <form>
    <div class="form-group">
      <label for="title">Title</label>
      <input
        type="text"
        class="form-control"
        id="title"
        [(ngModel)]="currentTutorial.title"
        name="title"
      />
    </div>
    <div class="form-group">
      <label for="description">Description</label>
      <input
        type="text"
        class="form-control"
        id="description"
        [(ngModel)]="currentTutorial.description"
        name="description"
      />
    </div>

    <div class="form-group">
      <label><strong>Status:</strong></label>
      {{ currentTutorial.published ? "Published" : "Pending" }}
    </div>
  </form>

  <button
    class="badge badge-primary mr-2"
    *ngIf="currentTutorial.published"
    (click)="updatePublished(false)"
  >
    UnPublish
  </button>
  <button
    *ngIf="!currentTutorial.published"
    class="badge badge-primary mr-2"
    (click)="updatePublished(true)"
  >
    Publish
  </button>

  <button class="badge badge-danger mr-2" (click)="deleteTutorial()">
    Delete
  </button>

  <button type="submit" class="badge badge-success" (click)="updateTutorial()">
    Update
  </button>
  <p>{{ message }}</p>
</div>

<div *ngIf="!currentTutorial">
  <br />
  <p>Cannot access this Tutorial...</p>
</div>

Define Routes for App Routing Module

There are 2 main routes:

• /add for add-tutorial component
• /tutorials for tutorials-list component

app-routing.module.ts

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { TutorialsListComponent } from './components/tutorials-list/tutorials-list.component';
import { AddTutorialComponent } from './components/add-tutorial/add-tutorial.component';

const routes: Routes = [
  { path: '', redirectTo: 'tutorials', pathMatch: 'full' },
  { path: 'tutorials', component: TutorialsListComponent },
  { path: 'add', component: AddTutorialComponent }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Add Navbar and Router View to Angular 13 Firebase App

Let’s open src/app.component.html, this App component is the root container for our application, it will contain a nav element.

<div>
  <nav class="navbar navbar-expand navbar-dark bg-dark">
    <a href="#" class="navbar-brand">bezKoder</a>
    <div class="navbar-nav mr-auto">
      <li class="nav-item">
        <a routerLink="tutorials" class="nav-link">Tutorials</a>
      </li>
      <li class="nav-item">
        <a routerLink="add" class="nav-link">Add</a>
      </li>
    </div>
  </nav>

  <div class="container mt-3">
    <h4>{{ title }}</h4>
    <router-outlet></router-outlet>
  </div>
</div>

Run & Check

You can run this Angular 13 Firebase CRUD App with command: ng serve.
Open browser with url: http://localhost:4200/ and check the result.

Conclusion

Today we’ve built an Angular 13 Firebase CRUD Application successfully working with Realtime Database using AngularFireDatabase from @angular/fire library. Now we can display, modify, delete object and list at ease.

If you want to use Firestore instead, please visit:
Angular Firestore CRUD example

Or File upload:
Angular Firebase Storage: File Upload/Display/Delete Files example

You can also find how to create Angular HTTP Client for working with Restful API in:
Angular CRUD Application with Rest API

Happy learning, see you again!

Further Reading

• Angular Template Syntax
• Angular Router Guide
• https://www.npmjs.com/package/@angular/fire
• Firebase Web Get Started

Fullstack CRUD Application:
– Angular + Node Express + MySQL example
– Angular + Node Express + PostgreSQL example
– Angular + Node Express + MongoDB example
– Angular + Spring Boot + H2 example
– Angular + Spring Boot + MySQL example
– Angular + Spring Boot + PostgreSQL example
– Angular + Spring Boot + MongoDB example
– Angular + Django example
– Angular + Django + MySQL example
– Angular + Django + PostgreSQL example
– Angular + Django + MongoDB example

Source Code

You can find the complete source code for this tutorial on Github.