Firebase hasMany

adapters.application.js

import FirebaseAdapter from 'emberfire/adapters/firebase';

export default FirebaseAdapter.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

models.article.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'),
  body: attr('string'),
  comments: hasMany('comment'),
});

models.comment.js

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

export default Model.extend({
  comment: attr('string'),
  article: belongsTo('article'),
});

router.js

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

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

Router.map(function() {
  this.route('articles');
});

export default Router;

routes.articles.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return this.store.findAll('article');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.articles.hbs

Articles
{{#each model as |article|}}
  {{article.title}} ({{article.comments.length}} comments}}
{{/each}}
<button {{action "addArticle"}}>Add article</button>

twiddle.json

{
  "version": "0.10.1",
  "ENV": {
  	"firebase": {
      "apiKey": "AIzaSyDdJ5jjfAIKvgzjqHZR8FEun681dHFUyb8",
      "authDomain": "emberfire-hasmany-test.firebaseapp.com",
      "databaseURL": "https://emberfire-hasmany-test.firebaseio.com",
      "storageBucket": ""
    }
  },
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.1",
    "ember-template-compiler": "2.6.0"
  },
  "addons": {
  	"emberfire": "2.0.1"
  }
}