Cannot include a Realm class into another Realm class

[HeavySnowJakarta]

What happened?

I wonder how to include custom objects on Realm class which I could found nowhere on the doc.

Repro steps

@RealmModel()
class _CustomField{
  // The tag if the custom field is a single string or a double string.
  late final String type;
  // The single field.
  late final String? single;
  // The double fields.
  late final String? our;
  late final String? their;
}

The codes above runs with no error. Then I tried

@RealmModel()
class _CustomField{
  // The tag if the custom field is a single string or a double string.
  late final String type;
  // The single field.
  late final String? single;
  // The double fields.
  late final String? our;
  late final String? their;
}

@RealmModel()
class _CustomFields{
  late List<CustomField> customFields;
}

Now it complains List<CustomField> is not a realm model type. Even without List the issue exists.

ChatGPT told me to add a label @RealmEmbedded but it doesn't seem to work. Dart language server complains Undefined name 'RealmEmbedded' used as an annotation. Try defining the name or importing it from another library. The script complains Could not resolve annotation for 'class _CustomField'.

What's more: What would it happen if I try to use an abstract class object as a data field of a Realm object? How to express things like Rust enums or C/C++ unions?

Version

Dart 3.5.1 Flutter 3.24.1

What Atlas Services are you using?

Local Database only

What type of application is this?

Flutter Application

Client OS and version

Windows 11 21H2

Code snippets

No response

Stacktrace of the exception/crash you're getting

Relevant log output

[nielsenko]

Use List< _CustomField> instead.

[nielsenko]

Regarding embedded types, ChatGPT is wrong, the correct annotation is @RealmModel(ObjectType.embeddedObject).

[nielsenko]

Realm doesn't support enums natively, so you will need to map them to either a string or an int. Something like:

import 'package:realm/realm.dart';

part 'main.realm.dart';

@RealmModel()
class _Car {
  @MapTo("type")
  late String _type;
  CustomType get type => CustomType.values.byName(_type);
  set type(final CustomType value) => _type = value.name;
}

enum CustomType { enabled, disabled }

final realm = Realm(Configuration.local([Car.schema]));

void main() {
  realm.write(() {
    // best bet right now ..
    realm.add(Car(CustomType.enabled.name));
    // or
    realm.add(Car('')..type = CustomType.enabled);
  });
}

[nielsenko]

As you seem to be a new user, I should probably end this by pointing out that all the Atlas Device Sync (aka Realm) SDKs are deprecated.