余烬数据模型中的json子文档 [英] json subdocuments in ember data model

问题描述

我有一个Web服务，返回的内容是这样的，其中有一个固定的信封，然后是一个json主体，其样式取决于 body_schema。我希望能够使用ember-data来管理这些信息，其中头等字段用于固定信封，而对象仅用于body字段。这可能吗？我似乎在文档中看不到任何类似内容，但我无法想象我是第一个遇到此问题的人。

I have a web service that returns something like this, where there is a fixed envelope and then a body that is json with a schema that depends on "body_schema". I'd like to be able to use ember-data to manage these, with first class fields for the fixed envelope and just an object for the body field. Is this possible? I can't seem to see anything like this in the docs but I can't imagine I'm the first with this issue.

{"messages":
[
  {"id":"5",
   "from": "someone",
   "to": "somebody",
   "body_schema": "atype", 
   "body": {
     {"url":"http://localhost:3030/blobs/511d63ddd0a6b5e863000001"}
   }
  }
]}

有什么想法吗？

推荐答案

我解决了这个问题-您需要做的是将自己的属性转换添加到现有的JSONTransforms集。我在app.js中定义了这样的对象转换：

I solved this - what you need to do is add your own attribute transform to the existing set of JSONTransforms. I defined an object transform like this in my app.js:

DS.JSONTransforms.object = {
    deserialize: function(serialized) {
      return Em.isNone(serialized) ? {} : serialized;
    },
    serialize: function(deserialized) {
      return Em.isNone(deserialized) ? {} : deserialized;
    }
};

有了这个，我可以定义这样的消息模型：

With this in place, I can define a messages model like this:

App.Message = DS.Model.extend({
  timestamp: DS.attr('date'),
  body: DS.attr('object'),
  ...
});

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