flatMap

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  posts: Ember.A([
      Ember.Object.create({ author: { name: 'steve' } }),
      Ember.Object.create({ author: { name: 'jill' } }),
      Ember.Object.create({ author: { name: 'andy' } })
    ]),
  
  authors: Ember.computed.mapBy('posts', 'author'),
  names: Ember.computed.mapBy('authors', 'name'),

  actions: {
  	addAuthor(name) {
      let newPost = Ember.Object.create({ author: { name: name } });
    	this.get('posts').addObject(newPost);
    }
  }

});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
});

export default Router;

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
});

templates.application.hbs

{{#each authors as |author|}}
	An author: {{author.name}}<br>
{{/each}}

<br><br>

<a href="#" {{action "addAuthor" "bill"}}>Add bill</a>

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}