New Twiddle

controllers.another-route.js

import Ember from 'ember';

export default Ember.Controller.extend({
  session: Ember.inject.service('my-service'),
  
  foo: Ember.computed(function() {
    return Ember.get(this.get('session').getSessionParams(), 'foo')
  })
});

controllers.application.js

import Ember from 'ember';

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

controllers.my-controller.js

import Ember from 'ember';

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

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('entry-route')
  this.route('another-route')
});

export default Router;

routes.another-route.js

import Ember from 'ember';

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

routes.entry-route.js

import Ember from 'ember';

export default Ember.Route.extend({
  session: Ember.inject.service('my-service'),
  
  beforeModel(transition) {
    this.get('session').setSessionParams(Ember.get(transition, 'queryParams'))
    this.transitionTo('another-route')
  }
});

services.my-service.js

import Ember from 'ember';

export default Ember.Service.extend({
  sessionParams: null,
  
  setSessionParams(params) {
    this.set('sessionParams', params)
  },
  
  getSessionParams(params) {
    return this.get('sessionParams')
  }
});

templates.another-route.hbs

<div>Foo? {{foo}}</div>

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#link-to "entry-route" (query-params foo="bar")}}Go{{/link-to}}
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}