AngularFire

1. Installation

Install AngularFire from npm

npm install firebase @angular/fire --save

2. Configuration

The following has been adapted from the AngularFire Installation and Setup Page

2.1. Add Firebase config to environments variable

Open /src/environments/environment.ts and add your Firebase configuration. We found the project configuration in Firebase Setup.

export const environment = {
  production: false,
  firebase: {
      apiKey: "<your-key>",
      authDomain: "<your-project-authdomain>",
      databaseURL: "<your-database-URL>",
      projectId: "<your-project-id>",
      storageBucket: "<your-storage-bucket>",
      messagingSenderId: "<your-messaging-sender-id>"
  }
};

2.2. Setup @NgModule for the AngularFireModule

Open /src/app/app.module.ts, inject the Firebase providers, and specify your Firebase configuration.

Add the following imports:

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

Add the following into:

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
      ...
    // Firebase modules
    AngularFireModule.initializeApp(environment.firebase, 'my-app-name'), // imports firebase/app needed for everything
  ]

2.3. Setup individual @NgModules

For this tutorial, we will only need the following module(s):

AngularFirestoreModule

Add the following imports to /src/app/app.module.ts -

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

Add the following into:

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
      ...
    // Firebase modules
    AngularFirestoreModule, // imports firebase/firestore, only needed for database features
  ]

Your /src/app/app.module.ts should look like the following:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';

import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';

import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';

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

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    // Firebase modules
    AngularFireModule.initializeApp(environment.firebase, 'my-app-name'), // imports firebase/app needed for everything    
    AngularFirestoreModule
  ],
  providers: [
    StatusBar,
    SplashScreen,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}

Milestone: You’ve configured AngularFire and Ionic to co-exist with each other.

3. Testing - Bind a Firestore collection to a list

3.1. Inject AngularFirestore

Open /src/app/home/home.page.ts and add the following:

Imports

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

Constructor

export class HomePage {
  items: Observable<any[]>;
  constructor(db: AngularFirestore) {
    this.items = db.collection('items').valueChanges();
  }
}

In /src/app/home/home.page.html, add the following before the ion-content closing tag -

...
<ul>
  <li class="text" *ngFor="let item of items | async">
    
  </li>
</ul>
</ion-content>

3.2. Run your app

ionic serve