stackoverflow-question#43119847

controllers.application.js

import Ember from 'ember';

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

controllers.my-route.js

import Ember from 'ember';
export default Ember.Controller.extend({
   queryParams: ['car_makes'],
   car_makes: [],
   carMakes: Ember.A([]),
   makes: [{make:'A'},{make:'B'}],
  
   actions: {
     addValue(value) {
       this.get('car_makes').pushObject(value);
     },
     
     removeValue(value) {
       console.log(value);
       this.get('car_makes').removeObject(value);
     },
     
     createValue(item) {
       let newMake = { make: item };
       
       this.get('makes').pushObject(newMake);
       this.set('selected', newMake);
     },
   }
});

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('my-route');
});

export default Router;

routes.my-route.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#link-to 'my-route'}}My Route{{/link-to}}
<br>
<br>

templates.my-route.hbs

{{ember-selectize
  content=makes
  multiple=false
  optionValuePath="content.make"
  optionLabelPath="content.make"
  selection=selected
  add-value=(action 'addValue')
  remove-value=(action 'removeValue')
  create-item=(action 'createValue')
  placeholder="Filter by car make..." }}

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-cli-selectize":"0.5.12"
 }
}