我有以下json对象
{
"notifications": [
{
"correspondenceId": "81",
"type": "notification",
"title": "Find Your Future at Indiana University",
"snippet": "",
"readFlag": "NO",
"date": "Delivered on: Jul 09, 2018 at 12:00 AM",
"readDate": "Read on: Apr 03, 2018 at 12:00 AM",
"icon": "message",
"color": "neutral"
},
{
"correspondenceId": "80",
"type": "notification",
"title": "My IU Experience",
"snippet": "",
"readFlag": "NO",
"date": "Delivered on: Jul 09, 2018 at 12:00 AM",
"readDate": "Read on: Apr 03, 2018 at 12:00 AM",
"icon": "message",
"color": "red"
},
{
"correspondenceId": "82",
"type": "notification",
"title": "Test RSVP",
"snippet": "",
"readFlag": "NO",
"date": "Delivered on: Jul 09, 2018 at 12:00 AM",
"readDate": "Read on: Apr 10, 2018 at 04:31 PM",
"icon": "message",
"color": "neutral"
}
]
}
我使用以下对象模型创建了built_value
import 'package:built_collection/built_collection.dart';
import 'package:built_value/built_value.dart';
import 'package:built_value/serializer.dart';
part 'notification.g.dart';
abstract class NotificationList
implements Built<NotificationList, NotificationListBuilder> {
BuiltList<NotificationElement> get notifications;
NotificationList._();
static Serializer<NotificationList> get serializer =>
_$notificationListSerializer;
factory NotificationList([updates(NotificationListBuilder b)]) =
_$NotificationList;
}
abstract class NotificationElement
implements Built<NotificationElement, NotificationElementBuilder> {
String get correspondenceId;
String get type;
String get title;
@nullable
String get snippet;
String get readFlag;
bool get derivedReadFlag {
return readFlag.contains("YES");
}
String get date;
@nullable
String get readDate;
String get icon;
String get color;
NotificationElement._();
static Serializer<NotificationElement> get serializer =>
_$notificationElementSerializer;
factory NotificationElement([updates(NotificationElementBuilder b)]) =
_$NotificationElement;
}
以及以下用于 json 反序列化的锯齿器：
import 'package:built_value/serializer.dart';
import 'package:built_value/standard_json_plugin.dart';
import 'package:sunapsis/datasource/dataobjects/login.dart';
import 'package:sunapsis/datasource/dataobjects/notification.dart';
part 'serializers.g.dart';
@SerializersFor([
Login,
NotificationList,
])
final Serializers serializers =
(_$serializers.toBuilder()..addPlugin(StandardJsonPlugin())).build();
登录对象模型工作正常，并且按预期工作，但是当我将通知列表添加到序列化程序时，serializer.g.dart 文件开始引发错误。我在序列化程序.g.dart文件中收到有关BuiltList的错误消息
常量创建的参数必须是常量表达式
常量值无效
未定义的名称"构建列表">
未定义的类"列表生成器">
在尝试编译时，我收到此错误，它说同样的事情
compiler message: lib/datasource/dataobjects/serializers.g.dart:24:15: Error: Getter not found: 'BuiltList'.
compiler message: BuiltList, const [const FullType(NotificationElement)]),
compiler message: ^
compiler message: lib/datasource/dataobjects/serializers.g.dart:25:21: Error: Method not found: 'ListBuilder'.
compiler message: () => new ListBuilder<NotificationElement>()))
compiler message: ^^^^^^^^^^^
不知道我哪里出了问题或问题可能是什么。 使用以下版本进行built_value和built_collection
built_value: "^5.5.3"
built_collection: "^3.1.1"
build_runner: ^0.8.0
built_value_generator: ^5.5.0
这是生成的 serializer.g.dart 文件：
// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'serializers.dart';
// **************************************************************************
// BuiltValueGenerator
// **************************************************************************
// ignore_for_file: always_put_control_body_on_new_line
// ignore_for_file: annotate_overrides
// ignore_for_file: avoid_annotating_with_dynamic
// ignore_for_file: avoid_returning_this
// ignore_for_file: omit_local_variable_types
// ignore_for_file: prefer_expression_function_bodies
// ignore_for_file: sort_constructors_first
Serializers _$serializers = (new Serializers().toBuilder()
..add(AuthProcess.serializer)
..add(Login.serializer)
..add(NotificationElement.serializer)
..add(NotificationList.serializer)
..addBuilderFactory(
const FullType(
BuiltList, const [const FullType(NotificationElement)]),
() => new ListBuilder<NotificationElement>()))
.build();
任何帮助将不胜感激。
看起来serializers.g.dart缺少built_collection的导入，这是您找到这些类型定义的地方。为它添加一个导入语句以serializers.dart(而不是生成的零件文件)，看看这是否可以解决问题。
万一这不起作用！
导入import 'package:built_collection/built_collection.dart';
在你的序列化器.dart中 它将反映在serializers.g.dart中