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'
	],
	foo: null,
	
	actions: {
	  removeItem: function(i) {
		  alert(`about to remove ${i.toString()}`);
		  this.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

you have to manually change the url above to:<br>
/search?foo[]=1&foo[]=2&foo[]=3<br><br>

<b>OUTPUT</b>
foo array contains: {{foo}}<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": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}