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How can I update DS.Model with json response from store.commit ()?

Given the models:

Blog.Post = DS.Model.extend({
    title: DS.attr('string'),
    tags:  DS.hasMany('Blog.Tag', { embedded: true })
});

Blog.Tag = DS.Model.extend({
    foo: DS.attr('string'),
    bar: DS.attr('string')
});

And instance:

var myPost = Blog.Post.createRecord({ id: 45, title: 'Foo Bar' })

When I do myPost.store.commit()(via ember-data DS.RESTAdapter), my server returns a list of automatically generated tags that should be applied to myPost. Example json response:

{
  posts: [
    {
      id: 45,
      title: 'Foo Bar',
      tags: [
        { id: 1, foo: 'bar1' },
        { id: 2, foo: 'bar2' }
      ]
    }
  ]
}

I would expect it to myPostfinish with two tags returned by json, but instead I get this error:

Error: <DS.StateManager:ember448> could not respond to event invokeLifecycleCallbacks in state rootState.loaded.updated.uncommitted.

What am I doing wrong here?

Edit: Refine json to include identifiers in @MikeAski comment. The above example is a simplified version of my actual case - the actual case includes tag identifiers.

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"" :

   Blog.Post = DS.Model.extend({
        title: DS.attr('string'),
        tags:  DS.hasMany('Blog.Tag', { embedded: always })
    });

    Blog.Tag = DS.Model.extend({
        foo: DS.attr('string'),
        bar: DS.attr('string'),
        post: DS.belongsTo('Blog.Post')
    });

:

Blog.RESTSerializer = DS.RESTSerializer.extend({
  init: function() {
    this._super();

    this.map('Blog.Post',{
      tag:{embedded:'always'},
    });
  }
});

post_id JSON.

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