Dependency Injection

controllers.application.js

import Ember from 'ember';
import Example from '../utils/example';

export default Ember.Controller.extend({
  myService: Ember.inject.service(),
  
  test1: Ember.computed({
    get() {
      // This is hard to maintain across the app but
      // easy for developers to understand.
      const myService = this.get('myService');
      return Example.create({myService});
    }
  }),

  test2: Ember.computed({
    get() {
      // This is the how Ember handles it but is a
      // bit of a departure from typical Ember docs
      const owner = Ember.getOwner(this);
      const ExampleFactory = owner._lookupFactory('util:example');
      return ExampleFactory.create();
    }
  })
});

services.my-service.js

import Ember from 'ember';

export default Ember.Service.extend({
  foo: 'bar'
});

templates.application.hbs

<h1>Test 1</h1>
<p><code>test1.foo == "{{test1.foo}}"</code></p>

<h1>Test 2</h1>
<p><code>test2.foo == "{{test2.foo}}"</code></p>

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}

utils.example.js

import Ember from 'ember';

export default Ember.Object.extend({
  myService: Ember.inject.service(),
  foo: Ember.computed.alias('myService.foo')
});