Firestore 将 DateTime 转换为 TimeStamp

Question

向firestore添加数据时，数据库将DateTime对象转换为TimeStamp 我的代码：

class JobApplication {
  DateTime time;
JobApplication({this.time});

JobApplication.fromMap(Map<String, dynamic> map)
  : time = map['time'] as DateTime;

Map<String, dynamic> toMap() {
return {
  'time': this.time,};
}

获取时显示以下错误

Expected a value of type 'DateTime', but got one of type 'Timestamp'

The relevant error-causing widget was: 
  StreamBuilder<QuerySnapshot> file:///home/koha/Projects/sirajulhuda_app/lib/screens/job_appli_screen.dart:56:24
When the exception was thrown, this was the stack: 
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 212:49      throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 60:3        castError
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 442:10  cast
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/types.dart 411:9        as
packages/sirajulhuda_app/models/job_application.dart 72:26                        fromMap

Answer 1

您需要将从 Firestore 获得的 TimeStamp 转换为 DateTime。

像这样：

Timestamp timestamp = // What you get from FireStore
DateTime date = timeStamp.toDate();

编辑

class JobApplication {
  DateTime time;
 JobApplication({this.time});

JobApplication.fromMap(Map<String, dynamic> map)
  : time = (map['time'] as Timestamp).toDate();

Map<String, dynamic> toMap() {
  return {
    'time': this.time,};
}