Cloud Firestore helps us store data in the cloud. It supports offline mode so our app will work fine (write, read, listen to, and query data) whether device has internet connection or not, it automatically fetches changes from our database to Firebase Server. We can structure data in our ways to improve querying and fetching capabilities. This tutorial shows you how to work with Firebase Firestore along with an Angular app that can do CRUD Operations.

Related Posts:
– Angular 8 Firebase tutorial: Integrate Firebase into Angular 8 App with @angular/fire
– Angular 8 Firebase CRUD operations with @angular/fire
– Angular 8 – Upload/Display/Delete files to/from Firebase Storage using @angular/fire

Technology

– Angular 8
– @angular/fire 5.1.2
– firebase 5.10.1

Video

Firebase Firestore with @angular/fire

Set up the Firebase Project & Install @angular/fire

Please visit this post to know step by step.

The only different for this tutorial is that, we use Firebase Firestore instead of Firebase Realtime Database:

Firebase Firebase CRUD operations for Object

Create an object binding/ Retrieve

item: AngularFirestoreDocument;
// db: AngularFirestore
this.item = db.doc('item');

// or
Observable item = db.doc('item').valueChanges();

Create

// db: AngularFirestore
const itemRef = db.doc('item');

// set() for destructive updates
itemRef.set({ name: 'grokonez'});

Update

// db: AngularFirestore
const itemRef = db.doc('item');
itemRef.update({ url: 'grokonez.com'});

Delete

// db: AngularFirestore
const itemRef = db.doc('item');
itemRef.delete();

Firebase Firebase CRUD operations for List of Objects

Create a list binding/ Retrieve

– Returns an Observable of data as a synchronized array of JSON objects without snapshot metadata. It is simple to render to a view:

items: Observable;
// db: AngularFirestore
this.items = db.collection('items').valueChanges();

– Returns an Observable of data as a synchronized array of DocumentChangeAction<>[] with metadata (the underlying data reference and snapshot id):

items: Observable;
// db: AngularFirestore
this.items = db.collection('items').snapshotChanges();

Create

// db: AngularFirestore
const itemsRef = db.collection('items');
itemsRef.add({ site: 'grokonez.com' });

Update

// set(): destructive update
// delete everything currently in place, then save the new value
const itemsRef = db.collection('items'); // db: AngularFirestore
itemsRef.doc(key).set({ url: 'gkz.com' });

// update(): non-destructive update
// only updates the values specified
const itemsRef = db.collection('items'); // db: AngularFirestore
itemsRef.doc(key).update({ url: 'grokonez.com' });

Delete

// db: AngularFirestore
const itemsRef = db.collection('items');
itemsRef.doc(key).delete();

// delete entire list
itemsRef.get().subscribe(
      querySnapshot => {
        querySnapshot.forEach((doc) => {
          doc.ref.delete();
        });
      },
      error => {
        console.log('Error: ', error);
      });

Configure offline persistence

By default, offline persistence is disabled. To enable it, call enablePersistence() method:

firebase.firestore().enablePersistence()
  .catch(err => {
    if (err.code == 'failed-precondition') {
      // only be enabled in one tab at a a time (multiple tabs open)
    } else if (err.code == 'unimplemented') {
      // browser does not support all of the features required to enable persistence
    }
  });

Firebase Firestore CRUD in Angular 8 App using @angular/fire

Project Overview

Goal

We will build an Angular 8 Firebase App using @angular/fire that can:
– add/remove Customer
– show all Customers
– update Customer’s status
to Firebase Firestore.

Project Structure

– environment.ts configure information to connect with Firebase Project.
– customer.ts defines Customer class data model.
– customer.service.ts defines CustomerService that uses @angular.fire to interact with Firebase.
– 3 Angular components:
+ create-customer for creating new item.
+ customer-details shows item detais
+ customers-list contains list of items, this is parent component of customer-details
– app-routing.module.ts defines how we route Angular components.
– app.module.ts declares and imports necessary environment & modules.

Step by Step

Set up the Firebase Project & Install @angular/fire

Please visit this post to know step by step.

Add Firebase config to environments variable

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

export const environment = {
  ...
  firebase: {
    apiKey: 'xxx',
    authDomain: 'gkz-angular-firebase.firebaseapp.com',
    databaseURL: 'https://gkz-angular-firebase.firebaseio.com',
    projectId: 'gkz-angular-firebase',
    storageBucket: 'gkz-angular-firebase.appspot.com',
    messagingSenderId: '123'
  }
};

Create Service & Components

Run the commands below:
– ng g s customers/Customer
– ng g c customers/CustomerDetails
– ng g c customers/CustomersList
– ng g c customers/CreateCustomer

Setup @NgModule

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { FormsModule } from '@angular/forms';

import { AngularFireModule } from '@angular/fire';
import { AngularFirestoreModule, FirestoreSettingsToken } from '@angular/fire/firestore';
import { environment } from '../environments/environment';

import { AppComponent } from './app.component';
import { CustomerDetailsComponent } from './customers/customer-details/customer-details.component';
import { CustomersListComponent } from './customers/customers-list/customers-list.component';
import { CreateCustomerComponent } from './customers/create-customer/create-customer.component';

@NgModule({
  declarations: [
    AppComponent,
    CustomerDetailsComponent,
    CustomersListComponent,
    CreateCustomerComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    AppRoutingModule,
    AngularFireModule.initializeApp(environment.firebase),
    AngularFirestoreModule
  ],
  providers: [{ provide: FirestoreSettingsToken, useValue: {} }],
  bootstrap: [AppComponent]
})
export class AppModule { }

Create Model Class

customer.ts

export class Customer {
  key: string;
  name: string;
  age: number;
  active = true;
}

The key field is important for updating item.

Create Data Service

customer.service.ts

import { Injectable } from '@angular/core';
import { AngularFirestore, AngularFirestoreCollection } from '@angular/fire/firestore';
import { Customer } from './customer';

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

  private dbPath = '/customers';

  customersRef: AngularFirestoreCollection = null;

  constructor(private db: AngularFirestore) {
    this.customersRef = db.collection(this.dbPath);
  }

  createCustomer(customer: Customer): void {
    this.customersRef.add({...customer});
  }

  updateCustomer(key: string, value: any): Promise {
    return this.customersRef.doc(key).update(value);
  }

  deleteCustomer(key: string): Promise {
    return this.customersRef.doc(key).delete();
  }

  getCustomersList(): AngularFirestoreCollection {
    return this.customersRef;
  }

  deleteAll() {
    this.customersRef.get().subscribe(
      querySnapshot => {
        querySnapshot.forEach((doc) => {
          doc.ref.delete();
        });
      },
      error => {
        console.log('Error: ', error);
      });
  }
}

Create Component for item Details

customer-details.component.ts

import { Component, OnInit, Input } from '@angular/core';
import { CustomerService } from '../customer.service';
import { Customer } from '../customer';

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

  @Input() customer: Customer;

  constructor(private customerService: CustomerService) { }

  ngOnInit() {
  }

  updateActive(isActive: boolean) {
    this.customerService
      .updateCustomer(this.customer.key, { active: isActive })
      .catch(err => console.log(err));
  }

  deleteCustomer() {
    this.customerService
      .deleteCustomer(this.customer.key)
      .catch(err => console.log(err));
  }

}

customer-details.component.html

  

    First Name:  {{customer.name}}
  
  

    Age:  {{customer.age}}
  
  

    Active:  {{customer.active}}
  

  Inactive

  Active

  Delete

  

Create Component to show List of Items

customers-list.component.ts

import { Component, OnInit } from '@angular/core';
import { CustomerService } from '../customer.service';
import { map } from 'rxjs/operators';

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

  customers: any;

  constructor(private customerService: CustomerService) { }

  ngOnInit() {
    this.getCustomersList();
  }

  getCustomersList() {
    this.customerService.getCustomersList().snapshotChanges().pipe(
      map(changes =>
        changes.map(c =>
          ({ key: c.payload.doc.id, ...c.payload.doc.data() })
        )
      )
    ).subscribe(customers => {
      this.customers = customers;
    });
  }

  deleteCustomers() {
    this.customerService.deleteAll();
  }

}

In the code above, we use snapshotChanges() with RxJS map() operator to get the id of each item and assign to key field.

customers-list.component.html:

Customers

  


  Delete All

We pass each customer item data to customer-details component.

Create Component to save item

create-customer.component.ts

import { Component, OnInit } from '@angular/core';
import { FormsModule } from '@angular/forms';

import { Customer } from '../customer';
import { CustomerService } from '../customer.service';

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

  customer: Customer = new Customer();
  submitted = false;

  constructor(private customerService: CustomerService) { }

  ngOnInit() {
  }

  newCustomer(): void {
    this.submitted = false;
    this.customer = new Customer();
  }

  save() {
    this.customerService.createCustomer(this.customer);
    this.customer = new Customer();
  }

  onSubmit() {
    this.submitted = true;
    this.save();
  }

}

create-customer.component.html:

Create Customer

  

    

      Name
      
    

    

      Age
      
    

    Submit
  



  
You submitted successfully!
  Add

Define App Routing Module

app-routing.module.ts

import { CreateCustomerComponent } from './customers/create-customer/create-customer.component';
import { CustomersListComponent } from './customers/customers-list/customers-list.component';

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

const routes: Routes = [
  { path: '', redirectTo: 'customers', pathMatch: 'full' },
  { path: 'customers', component: CustomersListComponent },
  { path: 'add', component: CreateCustomerComponent }
];

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

app.component.html:

  

    
{{title}}
    
{{description}}
  

  
  

To understand how to use Angular Routing Module, please visit:
How to work with Angular Routing – Spring Boot + Angular 4

Run & Check Result

– Run Angular App with command: npm start.
– Open browser with url http://localhost:4200/.

Result in Firestore console:

Source Code

Angular8Firestore

Conclusion

Now we’ve known how to connect Angular App with Firebase Firestore, how to make CRUD operations with Firestore for Object or List of Objects. We also created an Angular 8 Application that can save, receive, update, delete items with Firestore Database.

Happy learning!