如何在颤振中与类有字段时间戳"flutter pub run build_runner build"？

Question

我正试图使用cmd"flutter pub-run build_runner build"从对象序列化JSON格式，但它一直显示以下消息：

运行JsonSerializableGenerator时出错无法为timeTaking生成fromJson代码。提供的TypeHelper实例都不支持定义的类型。

@JsonSerializable(explicitToJson: true)
class RequestData {
@JsonKey(required: true)
String uid;
String phone;
String email;
String description;
/// Tell json_serializable that "owner_name" should be
/// mapped to this property.
@JsonKey(name: 'owner-name')
String ownerName;
@JsonKey(name: 'location-detail')
String locationDetail;
int status;// 0 waiting, 1 accepted, 2 done, 3 DOING , 4 cancel
List<String> imageUrls;
@JsonKey( required: true, name: "time-taking", toJson: _timestampToJson/*,fromJson: _timeStampFromJson*/)
Timestamp timeTaking;
RequestData({this.uid, this.phone, this.email, this.description,
this.ownerName, this.locationDetail, this.status, this.imageUrls,this.timeTaking});
RequestData.none();
}

我该如何解决这个问题？

Answer 1

我也有同样的问题，我的临时解决方案是创建一个JsonConverter来转换为DateTime:

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:json_annotation/json_annotation.dart';
class TimestampConvertDatetime  implements JsonConverter<DateTime, Timestamp> {
const TimestampConvertDatetime();
@override
DateTime fromJson(Timestamp json) {
return json.toDate();
}
@override
Timestamp toJson(DateTime object) {
return Timestamp.fromDate(object);
}
}

并应用于您的型号：

...
@TimestampConvertDatetime()
DateTime date;
....