Ember数据映射从JSON嵌入对象 [英] Ember-data mapping embedded object from JSON

问题描述

我正在努力解决一个奇怪的问题。我有一个名为 Activity 的模型，其属性定义如下：

所有者：DS .belongsTo（'App.User'，embedded：true）

用户当我得到这样的JSON响应时，也是一个定义的模型：

 某些单个属性和
 
 user：{id：etc.} 
  

我的所有属性映射良好，但用户嵌入的对象来自JSON不映射到所有者属性。但是，当我更改

 所有者
  

到

 用户
  

它映射良好。但是我想离开业主，因为这是我的意思的更好的表现。我试过这个动作：

 所有者：DS.belongsTo（'App.User'，key：'user'，embedded：true ）
  

但没有帮助。

增强自定义序列化程序中的 extractSingle （见下例）。此外，您应该定义如下所示的关系：

  App.Activity = DS.Model.extend（{
 name： DS.attr（'string'），
所有者：DS.belongsTo（'user'）
}）; 
 
 App.User = DS.Model.extend（{
 name：DS.attr（'string'），
 activities：DS.hasMany（'activity'）
}）; 
  

接下来，我建议使用 ActiveModelAdapter if您在与服务器通信时使用下划线（例如EmberData 0.13）：

  App.ApplicationAdapter = DS.ActiveModelAdapter; 
  

最后，要使用所有者 code>用户，在自定义序列化程序中覆盖 typeForRoot 。

示例：

  App.ApplicationSerializer = DS.ActiveModelSerializer.extend（{
 typeForRoot：function（root）{
 if（root =='owner'|| root =='owners'）{root ='user';} 
 return this._super（root）; 
}，
 
 //基于：https://github.com/emberjs/data/blob/master/TRANSITION.md#embedded-records 
 extractSingle：function（store，type，payload，id，requestType）{ 
 var owner = payload.activity.owner，
 ownerId = owner.id; 
 
 payload.owners = [owner]; 
 payload.activity.owner_id = ownerId ; 
 
 return this._super.apply（this，arguments）; 
} 
}）; 
  

示例JSBin

I am struggling with a strange problem. I have a model called Activity with a property defined like this:

owner: DS.belongsTo('App.User', embedded: true)

The User is also a defined model when I'm getting the JSON response like this:

some single properties and

user: { id: etc. }

My all properties map well but the user embedded object from JSON doesn't map to the owner property. However, when I change

owner

to

user

It maps well. But I want to leave the owner because it's a better representation of what I mean. I tried this action:

owner: DS.belongsTo('App.User', key: 'user', embedded: true)

but it didn't help.

解决方案

First, I recommend using the latest Ember / EmberData, but you will need to handle embedded records manually by enhancing extractSingle in a custom serializer (see example below). Also, you should define relationships like this:

App.Activity = DS.Model.extend({
  name:  DS.attr('string'),
  owner: DS.belongsTo('user')
});

App.User = DS.Model.extend({
  name:       DS.attr('string'),
  activities: DS.hasMany('activity')
});

Next, I recommend using the ActiveModelAdapter if you are using underscores when communicating with the server (i.e. like in EmberData 0.13):

App.ApplicationAdapter = DS.ActiveModelAdapter;

Finally, to use owner for a User, override typeForRoot in a custom serializer.

For example:

App.ApplicationSerializer = DS.ActiveModelSerializer.extend({
  typeForRoot: function(root) {
    if (root == 'owner' || root == 'owners') { root = 'user'; }
    return this._super(root);
  },

  // based on: https://github.com/emberjs/data/blob/master/TRANSITION.md#embedded-records
  extractSingle: function(store, type, payload, id, requestType) {
    var owner = payload.activity.owner,
        ownerId = owner.id;

    payload.owners = [owner];
    payload.activity.owner_id = ownerId;

    return this._super.apply(this, arguments);
  }
});

Example JSBin

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