Migrating the Realm Schema

If we want to do a simple migration, we just need to increment the version number of the schema. This way, Realm will perform an automatic migration (if possible) and we won't lose any data. So each time we alter our schema we'll need to also increment the schema's version number.

GoodHabitsRealmAppApp.swift

// ...
    init() {
        conf.schemaVersion = 2
    }
// ...

Complete listing

GoodHabitsRealmAppApp.swift

import SwiftUI
import RealmSwift

@main
struct GoodHabitsRealmAppApp: SwiftUI.App {
    var config = Realm.Configuration.defaultConfiguration

    init() {
        config.schemaVersion = 2
    }

    var body: some Scene {
        WindowGroup {
            MainView()
                .environment(\.realmConfiguration, config)
        }
    }
}