使用Ember-Data 1.0Beta设置多态别名 [英] Setting an Polymorphic Alias with Ember-Data 1.0Beta

问题描述

为了在Ember.js中使用多态关系，您需要配置适配器以识别多态模型的别名，如这里：

In order to use polymorphic relationships in Ember.js, you need to configure your adapter to recognize an alias for the polymorphic model, as documented here:

DS.RESTAdapter.configure('App.Post', {
  alias: 'post'
});

不幸的是，这种方法不再适用于Ember Data 1.0Beta，因为您无法再配置适配器。相反，你必须扩展它们。然而，只需这样做就不行：

Unfortunately, this approach no longer works with Ember Data 1.0Beta, as you can no longer configure adapters. Instead, you have to extend them. Simply doing this doesn't work, however:

DS.ActiveModelAdapter.extend('App.Post', {
  alias: 'post'
});

它会抛出错误：

Expected hash or Mixin instance, got [object String]

Ember-Data转换的href =https://github.com/emberjs/data/blob/master/TRANSITION.md#rest-adapter-and-serializer-configuration =nofollow>部分指南详细介绍了适配器和串行器的新方法。我不知道如何翻译这个建议，例如别名：'post'。该指南介绍了有关如何处理有效负载的大量细节，但我不知道别名是否适合该处理。

This section of Ember-Data's transition guide goes into detail about the new approach to adapters and serializers. I'm not sure how to translate that advice for something like alias: 'post', however. The guide goes into a great deal of detail about how payloads are processed, but I don't know where the alias was suppose to fit into that processing.

推荐答案

在顶部已经过时了，请参阅转换文档中的多态性部分 https://github.com/emberjs/data/blob/master/TRANSITION.md#polymorphic-relationships

That's out of date at the top, see the polymorphism portion in the transition documentation https://github.com/emberjs/data/blob/master/TRANSITION.md#polymorphic-relationships

多态关系

多形态类型现在使用型号名称+Type的json键进行序列化

Polymorphic types are now serialized with a json key of the model name + "Type"

例如给定多态关系：

 App.Comment = DS.Model.extend({
   message: DS.belongsTo('message', {
     polymorphic: true
   })
 });

Ember Data 0.13

Ember Data 0.13

 {
   "message": 12,
   "message_type": "post"
 }

Ember Data 1.0.beta.3：

Ember Data 1.0.beta.3:

 {
   "message": 12,
   "messageType": "post"
 }

另一个注意事项，如果你再次看到这个错误，那就是抱怨这个

On another note if you ever see that error again, it's complaining about this

 DS.ActiveModelAdapter.extend('App.Post', {
   alias: 'post'
 });

ember对象的任何扩展名的第一个参数都需要一个哈希或混合，你正在发送一个字符串Aka它想要一个实际的类（需要在你达到这段代码之前定义）。

the first parameter of any extension of an ember object expects a hash or mixin, and you are sending it a string. Aka it wants an actual Class (it needs to have been defined before you get to this portion of your code).

 DS.ActiveModelAdapter.extend(App.Post, {
   alias: 'post'
 });

这篇关于使用Ember-Data 1.0Beta设置多态别名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！