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Ember-data, hasMany relationships, subnet loading, nested route

I need to load a model from a rail backend using ember-data and its default REST adapter. I have a model that has many relationships with another:

App.Post = DS.Model.extend({
    title: DS.attr("String");
    comments: DS.hasMany('App.Comment', {keys: 'post_ids', embbeded: true});
})

App.Post = DS.Model.extend({
    body: DS.attr("String");
    post: DS.belongsTo('App.Post');
})

The JSON model returned by the server looks like

{
  title: "a title",
  comment_ids: [1,2,3,4]
}

I need to download all posts first without having to download related comments for efficiency reasons. I do it with

App.store.findAll('App.Post');

And, when I select a specific post, I need to download all the comments. In the documentation for ember-data, he said I just need to call

a_specific_post.get('comments')

When, I do this, I get a very long url with all the comments:

GET : /comments?ids%all_ids_appended_here

Of course, this will not work, and if I have a thousand comments, the URL is very long.

Is it possible to get a request that matches the nested rail routing model?

 GET /posts/post_id/comments

- https://github.com/ghempton/ember-routemanager . ember ?

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