Emberjs - 无法查询嵌入式模型或关联 [英] Emberjs - unable to query for embedded model or association

问题描述

这个小提琴的一小部分： http://jsfiddle.net/v2t67/ 显示在我的问题，但我的问题是我无法查询子模型的json，即注释模型。截至目前，我可以使用下面的查询从chrome开发者控制台访问父对象（Post Model），并从包含父对象的结果中访问父对象（Post Model），在控制台中，我可以点击它，我将看到嵌入的注释如图所示在此截图中： http://imgur.com/3WL4I 。

A small portion of this fiddle: http://jsfiddle.net/v2t67/ is displayed in my question, but my problem is that i am unable to query for the json of the child model ie the comment model. As of now, i can access the parent object (Post Model) from chrome developer console using the queries below and from the result that contains the parent object, in the console, i can click on it and i will see the embedded comments as shown in this screenshot: http://imgur.com/3WL4I.

那么如何使用objectAt（0）.toJSON（）直接返回来查询评论，需要点击父对象以查看它？

So how will query for the comment using objectAt(0).toJSON() to return it directly with out needing to click on the parent Object inorder to see it?

非常感谢。

 yt = App.store.findAll(App.Post)
 yt.objectAt(0).toJSON()   //to display the json for post

App.Comment = DS.Model.extend({
    content: DS.attr('string'),
    post: DS.belongsTo('App.Post')
});


App.Post = DS.Model.extend({
    body: DS.attr('string'),
    comments: DS.hasMany('App.Comment', { embedded: true } )
});

推荐答案

 App.Comment = DS.Model.extend({
   content: DS.attr('string'),
   post: DS.belongsTo('App.Post')
 });


 App.Post = DS.Model.extend({
   body: DS.attr('string'),
   comments: DS.hasMany('App.Comment', { embedded: true } )
 });

有关完整代码，请参阅：** http://jsfiddle.net/v2t67/ **

For the full code see: ** http://jsfiddle.net/v2t67/**

从源文件读取关联测试后，我找到了一个办法。关联测试如下：
** https://github.com/emberjs/data/blob/master/packages/ember-data/tests/unit/associations_test.js **

After reading the test for association from the source, i found a way to do it. The test for association is here: ** https://github.com/emberjs/data/blob/master/packages/ember-data/tests/unit/associations_test.js**

仍然坚持上述两个模型作为我们的例子，我们可以通过执行以下操作来查询嵌入式模型（注释模型）的json数据：

Still sticking to the two models above as our example, we can query for the json data of the embedded model (Comment model) by doing:

      **Approach 1**

 query = App.store.find(App.Post,  1)
 query.get('comments').objectAt(0).toJSON()

在进行进一步的检查时，我发现上述不行想要父模型的json（Post模型）。这是我如何去json：

While doing further checks, i discovered that the above will not work if you want the json of the parent model (Post model). This is how i go the json for that:

      **Approach 2**

 query = App.store.find(App.Post)
 query.objectAt(0).toJSON()

您将获得一个 TypeError：Object没有方法'objectAt'，如果您尝试使用方法1获取Post Model的json数据，并且您将获得 TypeError：无法调用方法'objectAt'未定义，如果您尝试使用方法2获取嵌入式模型的json数据。

You will get a TypeError: Object has no method 'objectAt', if you try to get the json data for the Post Model using approach 1 and you will get TypeError: Cannot call method 'objectAt' of undefined, if you try to get the json data for the embedded model using approach 2.

如果我找到出来一些新东西。

I will update this, if i find out something new.

           **UPDATE**

您可以通过将 {associations：true} 传递给 toJSON（）函数来获取嵌入式模型的json数据， / strong>如下所示：

You can get the approach 2 to return the json data for the embedded model without error by passing {associations: true}, to the toJSON() function as shown below:

 query = App.store.find(App.Post)
 query.objectAt(0).toJSON({associations: true})

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