Let’s Give Your Realm-Powered Ionic Web App the Native Treatment on iOS and Android! | MongoDB

Realm is an open-source, easy-to-use local database that helps mobile developers to build better apps, faster. It offers a data synchronization service—MongoDB Realm Sync—that makes it simple to move data between the client and MongoDB Atlas on the back end. Using Realm can save you from writing thousands of lines of code, and offers an intuitive way to work with your data.

After cloning the repo and running ionic serve, you'll have a really simple task management web application. You can register (using any user/password combination, Realm takes care of your onboarding needs). You can log in, have a look at your tasks, and add new tasks.

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Let’s build on what the Ionic team created for the web, and expand it by building a mobile app for iOS and Android using one of the best features Ionic has: the “Write Once, Run Anywhere” approach to coding. I’ll start with an iOS app.

A macOS-powered computer running Xcode (to develop for iOS). I’m using Xcode 13 Beta. You don’t have to risk your sanity.
Once you have your Realm app created, copy the Realm app ID from the MongoDB admin interface for Realm, and paste it into src/App.tsx, in the line:

export const APP_ID = '<Put your Realm App Id here>';

This will create the iOS Xcode Project native developers know and love, with the code from our Ionic app. I ran into a problem doing that and it was that the version of Capacitor used in the repo was 3.1.2, but for iOS, I needed at least 3.2.0. So, I just changed package.json and ran npm install to update Capacitor.

Now we have a new ios directory. If we enter that folder, we’ll see an App directory that has a CocoaPods-powered iOS app. To run this iOS app, we need to:

Install all CocoaPods with pod repo update && pod install, as usual in a native iOS project. This updates all libraries’ caches for CocoaPods and then installs the required libraries and dependencies in your project.

That’s it. Apart from updating Capacitor, we only needed to run one command to get our Ionic web project running on iOS!

How hard can it be to build our Ionic app for Android now that we have done it for iOS? Well, it turns out to be super-simple. Just cd back to the root of the project and type in a terminal:

In this case, 10.0.1.81 is my own IP address. As you can see, if you have more than one Emulator or even a plugged-in Android phone, you can select where you want to run the Ionic app.

Once running, you can register, log in, and add tasks in Android, just like you can do in the web and iOS apps.

The best part is that thanks to the synchronization happening in the MongoDB Realm app, every time we add a new task locally, it gets uploaded to the cloud to a MongoDB Atlas database behind the scenes. And all other apps accessing the same MongoDB Realm app can show that data!

Realm SDKs are well known for their syncing capabilities. You change something in the server, or in one app, and other users with access to the same data will see the changes almost immediately. You don’t have to worry about invalidating caches, writing complex networking/multithreading code that runs in the background, listening to silent push notifications, etc. MongoDB Realm takes care of all that for you.