Typed data classes

readme.md

Typed data classes

Created with <3 with dartpad.dev.

main.dart

import 'package:data_classes/data_classes.dart';

import 'package:common/const.dart';

part 'change_log.g.dart';

typedef FieldValueGetter<T> = T Function(dynamic);

enum EntityType {
  series,
  transaction,
}

enum ChangeField<T> {
  /// Transaction
  categoryLvl2({EntityType.transaction}, TypeConverters.categoryLvl2),
  counterpartyName({EntityType.transaction}, TypeConverters.counterpartyName);
  // ...

  const ChangeField(this.supportedEntities, this.getValue);
  final Set<EntityType> supportedEntities;
  final FieldValueGetter<T> getValue;
}

/// {@nodoc}
@DataClass()
class _ChangeModel<T> {
  late String id;

  late ChangeField<T> field;
  late String filterField;
  late Object filterFieldValue;
  TransactionDetailsChanger initiator = TransactionDetailsChanger.cashcoach;
  late T? nextValue;
  T? prevValue;

  /// Document timestamps
  late DateTime createdAt;
  late DateTime updatedAt;
}

class TypeConverters {
  static String counterpartyName(dynamic v) => v.toString();
  static CategoryLvl2 categoryLvl2(v) =>
      CategoryLvl2.values.firstWhere((item) => item.name == v.toString());
}

void checkType(Change change) {
  if (change is Change<CategoryLvl2>) print('CategoryLvl2');
  else print('unknown');
}