How to compare List of Map(i.e List) in dart using equatable package?

Question

I need to compare a list of map (i.e List < Map >) in dart using equatable for to be used inside a bloc state class. But the problem is that equatable seems to not compare that list of map properties.

class WaterCartDetailState extends Equatable {
  final String? status;
  final WateCartDetailModel? result;
  final List<Map>? mapData;
  const WaterCartDetailState({this.status, this.result, this.mapData});

  WaterCartDetailState copyWith(
      {String? status, WateCartDetailModel? result, List<Map>? mapData}) {
    return WaterCartDetailState(
        status: status ?? this.status,
        result: result ?? this.result,
        mapData: mapData ?? this.mapData);
  }

  @override
  List<Object?> get props => [status, result, mapData];
}

Since equatable is not comparing the List of Map. I cannot emit new state changes.

Does this answer your question? [How can I compare Lists for equality in Dart?](https://stackoverflow.com/questions/10404516/how-can-i-compare-lists-for-equality-in-dart) — Md. Yeasin Sheikh, Jul 20 '22 at 14:45
What is the Map model? It is the Map collection or a custom type which is defined by you? — Wilson Tran, Jul 21 '22 at 07:25
It is just primitive map offered by dart not any custom type — BestOFBest, Jul 22 '22 at 08:27

score 3 · Answer 1 · answered Aug 10 '22 at 14:33

From Docs

Equatable properties should always be copied rather than modified. If an Equatable class contains a List or Map as properties, be sure to use List.from or Map.from respectively to ensure that equality is evaluated based on the values of the properties rather than the reference.

yield WaterCartDetailState(status, result, List<Map>.from(mapData));

How to compare List of Map(i.e List) in dart using equatable package?

1 Answers1