Question

我正在尝试使用Dart，MongoDB和Objectory构建一个用于学习目的的小应用程序。为此，我创建了一个基本模型：

part of myapp;

class Member extends PersistentObject {

  String get username => getProperty('username');
  set username(String value) => setProperty('username',value);

  String get password => getProperty('password');
  set password(String value) => setProperty('password',value);

  // more fields here
}

void registerClasses() {
  objectory.registerClass(Member, () => new Member());
}

在我的主app文件中，我有：

library myapp;

import "package:redstone/server.dart" as app;
import "package:objectory/objectory.dart";
import "dart:core";

part "lib/member.dart";

Objectory objectory;

void main() {
  objectory = new Objectory("mongodb://localhost/myapp", registerClasses, false);
  objectory.initDomainModel().then((_) {
    app.setupConsoleLog();
    app.start(address: "127.0.0.1", port: 8080);
  });
}

当我运行它时，我得到了以下错误：

Breaking on exception: object of type NoSuchMethodError
Unhandled exception:
The null object does not have a method 'dataMapDecorator'.

NoSuchMethodError: method not found: 'dataMapDecorator'
Receiver: null
Arguments: [Instance of '_LinkedHashMap']
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#1      BasePersistentObject.BasePersistentObject (package:objectory/src/persistent_object.dart:10:46)
#2      PersistentObject.PersistentObject (package:objectory/src/persistent_object.dart:1:1)
#3      Member.Member (file:///Users/lucian/Projects/dart/eviq/bin/lib/member.dart:1:1)
#4      registerClasses.<anonymous closure> (file:///Users/lucian/Projects/dart/eviq/bin/lib/member.dart:74:45)
#5      Objectory.registerClass (package:objectory/src/objectory_base.dart:118:39)
#6      registerClasses (file:///Users/lucian/Projects/dart/eviq/bin/lib/member.dart:74:26)
#7      Objectory.initDomainModel (package:objectory/src/objectory_base.dart:141:28)
#8      main (file:///Users/lucian/Projects/dart/eviq/bin/eviq.dart:13:28)
#9      _startIsolate.isolateStartHandler (dart:isolate-patch/isolate_patch.dart:216)
#10     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:124)

知道我做错了什么吗？感谢。

Answer 1

您正在设置基础Objectory类。对于服务器端和浏览器环境，有Objectory的具体实现。假设您尝试在服务器端使用Objectory，则应使用ObjectoryDirectConnectionImpl

请参阅https://github.com/vadimtsushko/objectory/blob/master/example/console/blog_console.dart例如

library blog_example;
import 'package:objectory/objectory_console.dart';
import '../domain_model/domain_model.dart';


const Uri = 'mongodb://127.0.0.1/objectory_blog';
main(){
  objectory = new ObjectoryDirectConnectionImpl(Uri,registerClasses,true);
  var authors = new Map<String,Author>();
  var users = new Map<String,User>();
  objectory.initDomainModel().then((_) {

ObjectoryDirectConnectionImpl构造函数命令对象的第三个参数，用于在打开db后删除集合 - 对于样本和测试有用，您可能应该将它false

获取NoSuchMethodError：引导Objectory时

1 个答案: