Things

application.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  'things-store': Ember.inject.service('things-store'),
  model() {
    console.log('model', this.get('things-store.things').length);
    this.get('things-store').fetch();
    console.log('post', this.get('things-store.things').length);
    return this.get('things-store');
  },
  
  actions: {
    add() {
    	things.pushObject({id: Date.now()});
    }
  }
});

application.template.hbs

{{#each model.things as |thing|}}
  <h1>{{thing.id}}</h1>
{{/each}}

<button {{action 'add'}}>Add</button>

thing-store.service.js

import Ember from 'ember';

export default Ember.Service.extend({
  things: null,
  
  init() {
    this._super(...arguments);
    this.set('things', Ember.A());
  },
  
  fetch() {
    this.get('things').pushObjects([
      {id: Date.now()}
    ]);
    console.log(this.get('things').length);
  }
});

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}