Flutter restheart oid mapping

Question

使用flutter-dio和改进时，我遇到了restheart API的问题。

如何正确映射mongodb oid？

我有一个像这样的主要艺术：

import 'dart:convert';
import 'package:dio/dio.dart';
import 'dart:developer';
import 'package:retrofit_experiment/utils/rest_client.dart';
var auth = 'Basic ' + base64Encode(utf8.encode('admin:secret'));
Future<void> main(List<String> args) async {
final dio = Dio(); // Provide a dio instance
dio.options.headers["authorization"] = auth;
final client = RestClient(dio);
final json = await client.getUser("61a94d306c573846b4c0f8bf");
log(
'User with id 61a94d306c573846b4c0f8bf',
name: 'getUser',
error: jsonEncode(json),
);
client.getUser("61a94d306c573846b4c0f8bf").then((it) => print(it.id));
}

a rest_client.dart:

import 'package:retrofit/retrofit.dart';
import 'package:dio/dio.dart';
import 'package:retrofit_experiment/model/user.dart';
part 'rest_client.g.dart';
@RestApi(baseUrl: "http://localhost:8080")
abstract class RestClient {
factory RestClient(Dio dio, {String baseUrl}) = _RestClient;
@GET("/users/{id}")
Future<User> getUser(@Path("id") String id);
}

生成：

// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'rest_client.dart';
// **************************************************************************
// RetrofitGenerator
// **************************************************************************
class _RestClient implements RestClient {
_RestClient(this._dio, {this.baseUrl}) {
baseUrl ??= 'http://localhost:8080';
}
final Dio _dio;
String? baseUrl;
@override
Future<User> getUser(id) async {
const _extra = <String, dynamic>{};
final queryParameters = <String, dynamic>{};
final _data = <String, dynamic>{};
final _result = await _dio.fetch<Map<String, dynamic>>(_setStreamType<User>(
Options(method: 'GET', headers: <String, dynamic>{}, extra: _extra)
.compose(_dio.options, '/users/$id',
queryParameters: queryParameters, data: _data)
.copyWith(baseUrl: baseUrl ?? _dio.options.baseUrl)));
final value = User.fromJson(_result.data!);
return value;
}
RequestOptions _setStreamType<T>(RequestOptions requestOptions) {
if (T != dynamic &&
!(requestOptions.responseType == ResponseType.bytes ||
requestOptions.responseType == ResponseType.stream)) {
if (T == String) {
requestOptions.responseType = ResponseType.plain;
} else {
requestOptions.responseType = ResponseType.json;
}
}
return requestOptions;
}
}

和这个用户。艺术：

import 'package:json_annotation/json_annotation.dart';
part 'user.g.dart';
@JsonSerializable()
class User {
@JsonKey(name: '_id.$oid')
String? id;
@JsonKey(name: 'first_name')
String? firstName;
@JsonKey(name: 'last_name')
String? lastName;
String? avatar;
String? email;
User({this.id, this.firstName, this.lastName, this.avatar, this.email});
factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
Map<String, dynamic> toJson() => _$UserToJson(this);
}

生成：

// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'user.dart';
// **************************************************************************
// JsonSerializableGenerator
// **************************************************************************
User _$UserFromJson(Map<String, dynamic> json) {
return User(
id: json[r'_id.$oid'] as String?,
firstName: json['first_name'] as String?,
lastName: json['last_name'] as String?,
avatar: json['avatar'] as String?,
email: json['email'] as String?,
);
}
Map<String, dynamic> _$UserToJson(User instance) => <String, dynamic>{
r'_id.$oid': instance.id,
'first_name': instance.firstName,
'last_name': instance.lastName,
'avatar': instance.avatar,
'email': instance.email,
};

我得到的响应数据是这样的：

{"_id.$oid":null,"first_name":"Emma","last_name":"…faces/3-image.jpg","email":"[e-mail]"}

所有东西都得到了正确的映射，但不是oid。我做错了什么？

Answer 1

我不熟悉Dart，但我怀疑错误在于您试图将_id获取为字符串，其中它是ObjectId。

RESTHeart使用所谓的严格模式表示ObjectId

{
"_id": { "$oid": "61a94d306c573846b4c0f8bf" }
}

你可能想看看https://github.com/mongo-dart/mongo_dart/issues/145提供一个关于如何从ObjectId的字符串表示解析ObjectId的示例。