New Twiddle

controllers.application.js

import Ember from 'ember';

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

controllers.search.js

import Ember from 'ember';

export default Ember.Controller.extend({

	queryParams: [
		'foo',
    'pretty',
	],
  
	foo: [],
  pretty: '',
  prettyArray: Ember.computed('pretty', function() {
  	return this.get('pretty').split(',');
  }),
	
	actions: {
    addItem: function(item) {
      this.get('foo').pushObject(item);
 
      const pretty = this.get('pretty').split(',');
      pretty.push(item);
      
      this.set('pretty', pretty.uniq().reject(x => Ember.isBlank(x)).sort().join(","));
    },
    
	  removeItem: function(i) {
		  this.get('foo').removeObject(i.toString());
		  console.log(this.foo);
	  },	  
	}	
});

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('search');
});

export default Router;

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel() {
    this.transitionTo('search');
  }
});

routes.search.js

import Ember from 'ember';

export default Ember.Route.extend({
	queryParams: {
		foo: { refreshModel: true }
	}
});

templates.application.hbs

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

templates.index.hbs

{{link-to 'Click Here' 'search' }}

templates.search.hbs

<button {{action "addItem" "1"}}>Add 1</button>
<button {{action "addItem" "2"}}>Add 2</button>
<button {{action "addItem" "3"}}>Add 3</button>

<b>OUTPUT</b>
foo array contains: {{foo}}<br><br>
prettyArray array contains: {{prettyArray}}<br><br>
Click one to remove from array:<br>
(then note strange QP format change on url - how can ember retain the parameter-array format?)<br><br>

{{#each foo as |f|}}
delete <a href="#" {{action "removeItem" f}}>{{f}}</a><br>
{{/each}}
{{outlet}}

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": "release",
    "ember-data": "2.11.0",
    "ember-template-compiler": "release",
    "ember-testing": "release"
  },
  "addons": {}
}