Realm Flutter Add/Update/Delete in List

[Rohit_Daftari]

Hi All I need a quick solution or update on the following. I am trying to add / update / delete items from realm and the changes are not getting populated in the database. Check below code that can help you all to understand.

Error : Realm object is not managed

Sample Code (Add Item to Existing list)

Future<void> addTracker() async {
  var realm = Realm(realmConfig);

  Items item = Items(id: 3, name: 't3');
  realm.write(() {
    final wo = get();
    wo?.trackers.add(item);
  });

  realm.close();
}

If I print the list length after adding, I can get it correctly, but the changes are not reflected in the realm.

Generated Model

@RealmModel()
class _Orders {
  int? id;
  String? woName;
  late List<$Items> trackers;
}

@RealmModel()
class $Items {
  int? id;
  String? name;
}

get method

Orders? get() {
  var realm = Realm(realmConfig);
  var result = realm
      .all<Orders>()
      .map((e) => Orders(
            id: e.id,
            trackers: e.trackers.map((e) => Items(id: e.id, name: e.name)),
            woName: e.woName,
          ))
      .firstOrNull;
  realm.close();
  return result;
}

PS: Just ignore naming conventions this is just my sample app.

Error

Trackers are getting added but these changes are not reflecting and showing isManaged: false

[Kasper_Nielsen1 (Kasper Nielsen)]

Don’t close the realm until you are done using the objects it serve. Also I’m not sure what you are trying to do with the map call?

I have tried re-writing your code the best of my understanding, in a way that works:

import 'package:realm_dart/realm.dart';

part 'forum241674.g.dart';

@RealmModel()
class _Orders {
  @PrimaryKey()
  late int id;
  late String woName;
  late List<$Items> trackers;

  @override
  String toString() => 'Orders{id: $id, woName: $woName, trackers: $trackers}';
}

@RealmModel()
class $Items {
  // Prefer pseudo-random classes like ObjectId or Uuid over int for primary keys.
  // It is hard to ensure uniqueness with int in a distributed system.
  @PrimaryKey()
  late ObjectId id;
  late String name;

  @override
  String toString() => 'Items{id: $id, name: $name}';
}

final realmConfig = Configuration.local(
  [Orders.schema, Items.schema],
  shouldDeleteIfMigrationNeeded: true, // only for testing
);
// Don't open an close realms all the time. One per isolate will serve you well.
final realm = Realm(realmConfig);

Orders get() {
  // This is a bit contrieved, but I'm just trying to follow your sample.
  // It finds the first order, or create a new one if none exists.
  // I assume you want more orders eventually.
  return realm.all<Orders>().firstOrNull ?? realm.add(Orders(1, 'wo1'));
}

Future<void> addTracker() async {
  final item = Items(ObjectId(), 'an item');
  realm.write(() {
    final wo = get();
    wo.trackers.add(item);
  });
}

Future<void> main(List<String> args) async {
  await addTracker();
  print(realm.all<Orders>());
  // Don't close until you are done with all the objects served by the realm.
  // In general you don't need to close realms explicitly
  realm.close();
  Realm.shutdown(); // only needed for non-Flutter apps, due to Dart VM issue.
}

It adds one new item to the one-and-only order on each run.

Sample output after a few runs:

(Orders{id: 1, woName: wo1, trackers: [Items{id: 64eced0fbda108e828d1dc82, name: an item}, Items{id: 64eced13abd6bb7b17ed0372, name: an item}, Items{id: 64eced18b0019cf0772a7e8b, name: an item}, Items{id: 64eced309533aea59065fec8, name: an item}, Items{id: 64eced3881db05fb23ff246a, name: an item}, Items{id: 64eced5e75f7626e497739f3, name: an item}, Items{id: 64ecee3e0601449d4414c33a, name: an item}]})

Exited.

[Rohit_Daftari]

Hi, Thanks for the super quick reply.

It’s working, Realm Initialization & closing was the only issue. Moreover, the map I did was throwing invalidated or deleted errors but the same was fixed when only single initialization & close calls were carried out.

Thanks Again.