import 'package:json_annotation/json_annotation.dart'; part 'attention_tip.g.dart'; @JsonSerializable() class AttentionTip { @JsonKey(name: 'card_num') int? cardNum; String? tip; AttentionTip({this.cardNum, this.tip}); factory AttentionTip.fromJson(Map json) { return _$AttentionTipFromJson(json); } Map toJson() => _$AttentionTipToJson(this); }