New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['year'],
  
  year: null,
});

routes.application.js

import Ember from 'ember';

const YEAR_MIN = 2010;
const YEAR_MAX = (new Date).getFullYear();

export default Ember.Route.extend({
  beforeModel(transition) {
    const year = Number.parseInt(transition.queryParams.year, 10);
    
    if (!Number.isSafeInteger(year) || year < YEAR_MIN || year > YEAR_MAX) {
      this.replaceWith(this.routeName, {
        queryParams: { year }
      });
    }
  }
});

templates.application.hbs

Selected year: {{if year year 'none'}}

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"
  }
}