class Attachment { Attachment({ this.id, this.name, }); Attachment.fromJson(dynamic json) { id = json['id']; name = json['name']; } num id; String name; Attachment copyWith({ num id, String name, }) => Attachment( id: id ?? this.id, name: name ?? this.name, ); Map toJson() { final map = {}; map['id'] = id; map['name'] = name; return map; } }