updated model

@JsonSerializable(explicitToJson: true, includeIfNull: false)

final class Note implements Identifiable {

  static const TITLE_KEY = 'title';

  static const MESSAGE_KEY = 'message';

  static const DESCRIPTION_KEY = 'description';

  static const CREATED_AT_KEY = 'createdAt';

  static const AUTHOR_KEY = 'username';

  @override

  @JsonKey(name: TITLE_KEY)

  final String title;

  @JsonKey(name: MESSAGE_KEY)

  final String message;

  @JsonKey(name: DESCRIPTION_KEY)

  final String description;

  @JsonKey(name: CREATED_AT_KEY)

  final DateTime createdAt;

  const Note({

  Note({

    required this.id,

    required this.title,

    required this.message,

    required this.createdAt,

  });

    required this.description,

    DateTime? createdAt,

  }) : createdAt = createdAt ?? DateTime.now();

  Note copyWith({

    String? id,

    String? title,

    String? description,

    DateTime? createdAt,

  }) {

    return Note(

      id: id ?? this.id,

      title: title ?? this.title,

      description: description ?? this.description,

      createdAt: createdAt ?? this.createdAt,

    );

  }

  @override

  bool operator ==(Object other) =>

Note _$NoteFromJson(Map<String, dynamic> json) => Note(

      id: json['id'] as String,

      title: json['title'] as String,

      message: json['message'] as String,

      description: json['description'] as String,

      createdAt: DateTime.parse(json['createdAt'] as String),

    );

Map<String, dynamic> _$NoteToJson(Note instance) => <String, dynamic>{

      'id': instance.id,

      'title': instance.title,

      'message': instance.message,

      'description': instance.description,

      'createdAt': instance.createdAt.toIso8601String(),

    };