Ember Set Relationship to itself

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  init() {
  	const store = this.get('store');
    
    const posts = [
    	store.createRecord('post', { title: 'foo' }),
      store.createRecord('post', { title: 'bar' })
    ];
    const author = store.createRecord('author', { id: '0', name: 'alice', posts });
    
    this.set('author', author);
  },
  
  store: Ember.inject.service('store'),
  
  theArrayString: Ember.computed('author.posts', function () {
    return JSON.stringify(this.get('author.posts').toArray());
  }),
  
  actions: {
    setPostsAgain() {
      const author = this.get('author');
      const postsRelationship = author.get('posts');
      
      // NOTE: We only set the original value back
      author.set('posts', postsRelationship);
    }
  }
});

models.author.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  posts: hasMany('post')
});

models.post.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  title: attr('string')
});

templates.application.hbs

<div>
	<code>author.posts.toArray(): </code> {{theArrayString}}
</div>

<button type="button" {{action 'setPostsAgain'}}>Set Posts Again</button>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}