realm

import Realm from 'realm'; // Define your schema (object models) class Car extends Realm.Object { static schema = { name: 'Car', properties: { make: 'string', model: 'string', miles: { type: 'int', default: 0 }, }, }; } class Person extends Realm.Object { static schema = { name: 'Person', properties: { name: 'string', cars: 'Car[]', // Define a relationship }, }; } // Open a realm with the defined schemas async function runRealmExample() { try { const realm = await Realm.open({ path: 'myrealm.realm', schema: [Car, Person], schemaVersion: 1, // Exclude from iCloud backup, useful for app-specific data that can be re-downloaded excludeFromIcloudBackup: process.env.NODE_ENV === 'production' ? true : false, }); // Write to the realm within a transaction realm.write(() => { const myCar = realm.create('Car', { make: 'Honda', model: 'Civic', miles: 1000 }); realm.create('Person', { name: 'Alice', cars: [myCar] }); realm.create('Car', { make: 'Toyota', model: 'Camry', miles: 5000 }); }); // Query objects const cars = realm.objects('Car'); console.log(`Total cars in the realm: ${cars.length}`); const hondas = cars.filtered('make == "Honda"'); console.log(`Number of Hondas: ${hondas.length}`); // Update an object realm.write(() => { const civic = hondas[0]; if (civic) { civic.miles += 500; } }); console.log(`Honda Civic miles after update: ${hondas[0]?.miles}`); // Remember to close the realm when done to release resources realm.close(); } catch (error) { console.error("Error opening or interacting with Realm:", error); } } runRealmExample();