Question

我想这个应该相当简单，但我还没有找到问题的根源，我还在学习Ember-Data。

我有两个模型，它们之间有hasMany的关系：

App.User = DS.Model.extend({

  displayName: DS.attr('string'),
  email: DS.attr('string'),
  firstName: DS.attr('string'),
  lastName: DS.attr('string'),
  location: DS.attr('string'),
  messages: DS.hasMany('message')

});

App.Message = DS.Model.extend({

  user: DS.belongsTo('user'),
  createdAt: DS.attr('date'),
  updatedAt: DS.attr('date'),
  fullText: DS.attr('string'),
  subject: DS.attr('string'),
  recipients: DS.attr('string')

});

Ember-data从服务器检索用户，输出如下：

{  
   "user":[  
      {  
         "id":"3",
         "firstName":"A",
         "lastName":"User",
         "location":"",
         "email":"a@user.com",
         "displayName":"auser",
         "messages":[  
            {  
               "id":"3",
               "user":"3",
               "createdAt":"2014-08-06 20:08:38",
               "fullText":"Here is some text",
               "recipients":"",
               "subject":"Message subject (may not be needed)",
               "updatedAt":"2014-08-06 20:08:38"
            }
         ]
      }
   ]
}

但是，当Ember尝试使用此响应填充商店时，我收到以下错误：

Error while loading route: TypeError: Cannot read property 'typeKey' of undefined
    at Ember.Object.extend.modelFor (http://www.musicicons.dev/assets/packages/ember-data/ember-data.js:10667:22)
    at Ember.Object.extend.recordForId (http://www.musicicons.dev/assets/packages/ember-data/ember-data.js:10112:21)
    at deserializeRecordId (http://www.musicicons.dev/assets/packages/ember-data/ember-data.js:11116:27)
    at deserializeRecordIds (http://www.musicicons.dev/assets/packages/ember-data/ember-data.js:11130:9)
    at http://www.musicicons.dev/assets/packages/ember-data/ember-data.js:11095:11
    at http://www.musicicons.dev/assets/packages/ember-data/ember-data.js:9317:20
    at http://www.musicicons.dev/assets/packages/ember/ember.js:3428:16
    at Object.OrderedSet.forEach (http://www.musicicons.dev/assets/packages/ember/ember.js:3271:10)
    at Object.Map.forEach (http://www.musicicons.dev/assets/packages/ember/ember.js:3426:10)
    at Function.Model.reopenClass.eachRelationship (http://www.musicicons.dev/assets/packages/ember-data/ember-data.js:9316:42)

如果我从hasMany模型中删除或重命名User关系，则错误消失，所以我认为我的JSON构造不正确。

Answer 1

更新

Ember Data现在支持它：Ember-data embedded records current state?

原始

默认情况下，Ember Data不支持嵌入式记录，这意味着你的json应该采用这种格式（如果你是通过id 3找到用户）：

{  
   "user":
   {  
      "id":"3",
      "firstName":"A",
      "lastName":"User",
      "location":"",
      "email":"a@user.com",
      "displayName":"auser",
      "messages": [3]
    },
    "messages":[  
     {  
       "id":"3",
       "user":"3",
       "createdAt":"2014-08-06 20:08:38",
       "fullText":"Here is some text",
       "recipients":"",
       "subject":"Message subject (may not be needed)",
       "updatedAt":"2014-08-06 20:08:38"
     }
    ]  
}

示例：http://emberjs.jsbin.com/OxIDiVU/918/edit

您可以在此处阅读有关嵌入式记录的信息：Ember-data embedded records current state?

Answer 2

Ember Data现在支持嵌入式记录，因此您需要做的就是定义自定义序列化程序，Ember Data应该按原样接受您的JSON有效负载。以下是您需要定义的自定义序列化程序：

App.UserSerializer = DS.RESTSerializer.extend(DS.EmbeddedRecordsMixin, {
  attrs: {
    messages: {embedded: 'always'}
  }
});

这基本上告诉Ember Data'消息'将成为用户对象图的一部分。

如果你正在使用ActiveModelSerializer，那么它将会是这样的：

App.UserSerializer = DS.ActiveModelSerializer.extend(DS.EmbeddedRecordsMixin, {
  attrs: {
    messages: {embedded: 'always'}
  }
});

Answer 3

也许有人会发现这些信息很有用，因为这是谷歌第一次针对此错误按摩：

当您的模型看起来像这样时，也会发生此错误：

App.Project = DS.Model.extend({
    customers: DS.belongsTo('customer')  
});

属性采用复数形式，但使用的是belongsTo而不是hasMany

EmberJS：无法读取属性＆＃39; typeKey＆＃39;未定义的

3 个答案:

更新

原始