so#43689814

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: ['age'],
  age: 4,
});

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({
  model(params) {
    return params.age;
  } 
});

templates.application.hbs

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

<br>
{{outlet}} 
<br>
<br>

templates.index.hbs

{{#link-to 'my-route' (query-params age=4)}}Link to my route with default age{{/link-to}}
<br>
{{#link-to 'my-route' (query-params age=5)}}Link to my route with age=5{{/link-to}}

templates.my-route.hbs

age param is {{model}}
<br>
{{#link-to 'index'}}Back to index{{/link-to}}

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-data": "2.12.1"
  }
}