init method

@override Future<void> init()

Subclasses must implement this to initialize the datastore.

Implementation

@override
Future<void> init() async {
  // Specified in digial ocean's environment settings:
  // https://docs.digitalocean.com/products/app-platform/how-to/use-environment-variables/#define-build-time-environment-variables
  final mongoUrl = Platform.environment['DATABASE_URL'];
  if (mongoUrl == null) {
    throw Exception('DATABASE_URL environment variable is not set.');
  }
  db = await mongo.Db.create(mongoUrl);
  await db.open();
}