Upgrading to AngularFire2 4.0

This tutorial will help if you are upgrading an existing AngularFire2 Offline app that is already using AngularFire2 version 2.x.

Not upgrading?

Checkout a full install tutorial for AngularFire2 Offline:

• Angular Cli Tutorial 📗
• Ionic Tutorial 📘

1. Upgrade @NgModule (Diff)

Open /src/app/app.module.ts and add AngularFireDatabaseModule to your imports:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AngularFireModule } from 'angularfire2';
import { AngularFireOfflineModule } from 'angularfire2-offline';
import { AngularFireDatabaseModule } from 'angularfire2/database';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent,
    ...OtherComponents
  ],
  imports: [
    AngularFireDatabaseModule,
    AngularFireModule.initializeApp(environment.firebase),
    AngularFireOfflineModule,
    BrowserModule,
    ...OtherModules
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

2. Upgrade components (Diff)

Change your import

Add /database to your AngularFire2 Offline import

import { AfoObjectObservable, AngularFireOfflineDatabase } from 'angularfire2-offline/database';

Replace calls to AngularFireOffline.database with AngularFireOfflineDatabase

Before

constructor(afo: AngularFireOffline) {
  afo.database.list('foo');
}

After

constructor(afoDatabase: AngularFireOfflineDatabase) {
  afoDatabase.list('foo');
}

Full Component

import { Component } from '@angular/core';
import {
  AfoListObservable,
  AfoObjectObservable,
  AngularFireOfflineDatabase } from 'angularfire2-offline/database';

@Component({
  selector: 'project-name-app',
  template: `
  <h1>{{ (info | async)?.name }}</h1>
  <ul>
    <li *ngFor="let item of items | async">
      {{ item?.name }}
    </li>
  </ul>
  `
})
export class MyApp {
  info: AfoObjectObservable<any>;
  items: AfoListObservable<any[]>;
  constructor(afoDatabase: AngularFireOfflineDatabase) {
    this.info = afoDatabase.object('/info');
    this.items = afoDatabase.list('/items');
  }
}

AngularFire2 upgrade guide

Also, checkout the AngularFire2 upgrade guide.