由hasMany关系定义的Ember孩子突然改变为嵌入式模型 [英] Ember children defined by a hasMany relationship suddenly change to embedded model

问题描述

我有以下模型定义：

App.Post = DS.Model.extend({
  title: DS.attr('string'),
  comments: DS.hasMany('comment')
});

App.Comment = DS.Model.extend({
  message: DS.attr('string')
});

如果我创建一个带有注释的Post条目，存储在我的浏览器中的JSON本地存储引用注释作为一个非常有效的ID数组：

If I create a Post entry with a Comment, the JSON stored in my browsers local storage references the Comments as an array of IDs which works great:

...
"o3duh":{
    "id":"o3duh",
    "title":"How to write Ember",
    "comments":[
        "jf0a2"
    ]
}
...

但是，当我添加另一个帖子的那一刻，JSON突然改变了这样的评论嵌入：

However, the moment I add another Post, the JSON suddenly changes such that Comments are embedded:

...
"o3duh":{
    "id":"o3duh",
    "title":"How to write Ember",
    "comments":[
        {
            "message":"First!"
        }
    ]
},
"6kudl":{
    "id":"6kudl",
    "title":"Learning Ember is painful",
    "comments":[
    ]
}
...

为什么会发生这种情况？我可以防止它吗这导致我的问题，因为一旦它改变成这种嵌入的格式，LSAdapter在重新加载页面时不能读取数据。

Why is this happening? Can I prevent it? This is causing me problems because once it changes into this embedded format, the data cannot be read by the LSAdapter when reloading the page.

这是一个 JSBin ，所以你可以看到它发生在你身上，看到完整的JSON等。要重现问题，只需创建一个帖子添加评论，然后您可以刷新页面没有问题。然后添加另一个帖子并尝试刷新页面。

Here is a JSBin so you can see it happen for yourself and see the full JSON etc. To reproduce the problem, just create a post and add a comment then you can refresh the page without problem. Then add another post and try to refresh the page.

我不知道问题是与ember数据还是本地存储适配器。

I'm not sure if the problem is with ember-data or the localstorage adapter.

推荐答案

我通过修改LocalStorageAdapter来解决问题，这样它只会尝试以预期的格式保留JSON。

I solved the problem by modifying the LocalStorageAdapter so that it only attempts to persist JSON in the expected format.

您可以在这里查看我提交给原作者的拉动请求： https://github.com/rpflorence/ember-localstorage-adapter/pull/26

You can see the pull request I submitted to the original author here: https://github.com/rpflorence/ember-localstorage-adapter/pull/26

希望将其折叠到LSAdapter项目中，或更好的是，有人会想出一个更好的解决方案;）

Hopefully it will either get folded into the LSAdapter project, or better still, someone will come up with a better solution ;)

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