Firebase Backend

In this guide, we aim to guide you in setting up the app under your own firebase account and updating the backend of the app. If you don't have one, you can create a firebase account here.

Using your own Firebase account

To use your own Firebase account for this account, please create a new project and enable email/password authentication. To enable email/password authentication, go to Authentication from the left menu, then go to Sign-in Methods and enable the Email/password field.

From there you can go to settings -> Add Firebase to your web app and copy the given code snippet in src/components/Firebase.js. This is how the beginning of the file looks like:

import * as firebase from "firebase";

import {User} from "../Model";
import {DEFAULT_USER} from "../Constants";

const config = {
    apiKey: "...",
    authDomain: "...",
    databaseURL: "...",
    projectId: "...",
    storageBucket: "",
    messagingSenderId: "..."

Last step, you need to deploy the database validation and security rules to your account. To generate the rules.json file run the following command:

yarn generate

rules.json is generated from rules.bolt. Now you can login with the firebase cli using the command below:

firebase login

If you were already signed-in with different credentials, you can use the following command:

firebase login --reauth

In .firebaserc you can replace the project id react-native-do with your own project id. You are now ready to deploy the database rules using the following command:

yarn deploy

Et voilà! You are up and running with your own Firebase backend.

Checking the data

Once your application is up and running, you can check the list of created users by going into Authentication -> Users.

Updating the backend

Of course, the data model of your app is likely to be quite different from the one we provided you with. We use a single source of truth for the data model of the app which is contained in rules.bolt. This file is written using the Firebase Bolt Security and Modeling Language. We use this file to generate the database security and validations rules (rules.json) but also the flow types for the React Native app (src/Model.js).

When modifying rules.bolt, you can re-generate the necessary artifacts using the following command:

yarn generate

And to deploy the new database rules:

yarn deploy


Assume you want to had a new property in the type Profile named pictureURL. You can update the type definition the following way:

type Profile {
    name: String,
    birthday: Number,
    pictureURL: String,
    emailNotifications: Boolean,
    phoneNotifications: Boolean

To re-generate the artifacts:

yarn generate

Now the code of the app needs to be refactored accordingly. Flow type checker will point out these places for you. Run:

yarn flow
  8:   profile: Profile,
                ^^^^^^^ property `pictureURL` of Profile. Property not found in
  5:     profile : {
                   ^ object literal. See: src/Constants.js:5

Once the code refactoring is done, you can deploy the new database rules:

yarn deploy

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