Ionic store data for a user in Firebase

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In the previous article, I added Firebase to Ionic for authentication users. But more importantly, we want to store data for this specific user.

How do we go about this?

In the example today, we will be storing very basic data to see how we can use it.

Firebase count

Adding the Firebase database

Let's create the Firebase database, head over to the Firebase console, and click the database section.

New database

Once you add the database, copy the link and add it to our environment.ts file.

export const environment = {
  production: false,
  firebaseConfig: {
    apiKey: "XXXXXXXXXXXXXXXXXX",
    authDomain: "xxx.firebaseapp.com",
    projectId: "xxxxxxx",
    storageBucket: "xxxxx.appspot.com",
    databaseURL: "https://xxxxxxxx-default-rtdb.firebaseio.com",
    messagingSenderId: "xxxxxxxxx",
    appId: "1:xxxxxx:web:xxxxxxx",
    measurementId: "G-xxxxx"
  }
};

Then, let's add the Firebase database module in our app.module.ts file.

imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    AngularFireModule.initializeApp(environment.firebaseConfig),
    AngularFireAuthModule,
    AngularFireDatabaseModule
],

We can now head over to our tab1.page.ts file to add the logic for our database.

Let's add the new variables and add the database in our construct.

ref: any;
count: Observable<any>;

constructor(public fireAuth: AngularFireAuth, public db: AngularFireDatabase)

Then we can change the subscribe on the user and see if we have a user.

this.fireAuth.authState.subscribe((user) => {
  this.user = user ? user : null;
  if (this.user !== null) {
    this.ref = db.object(user.uid);
    this.count = this.ref.valueChanges();
    this.count.subscribe((initial) => {
      if (initial === null) this.ref.set(1);
    });
  }
});

This will create a reference to our database object for the current user. This is based on their user id.

Next, we have the count, which keeps track of the value directly from Firebase.

We also subscribe to it to see the initial value. If this is null, it means it doesn't exist, so we set the value to be 1.

Now let's add a cool simple function that will increment this value.

addCount() {
    this.ref.set(firebase.database.ServerValue.increment(1));
}

This concludes the JavaScript we need, so let's go to the HTML side to add this button.

<ion-button (click)="addCount()" expand="block" color="success">{{ count | async }}</ion-button>

This button shows the count variable, and also, when we click it, it will execute the addCount function.

Before logging in, our database will look like this:

Firebase empty storage

When logging in, the user object will be created:

Firebase user id to 1

And when the user clicks the button a couple of times, we get this result:

Firebase button clicked

You can find today's code on the following GitHub repo.

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