Query params don't work

adapters.application.js

import DS from "ember-data";

export default DS.FixtureAdapter.extend({
  queryFixtures: function(fixtures, query, type) {
    console.log(query);
    console.log(type);
    if (!query) {
      return fixtures;
    }
    return fixtures.filter(function(item) {
      for(var prop in query) {
        if( item[prop] != query[prop]) {
          return false;
        }
      }
      return true;
    });
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  actions: {
    loadSecretBook: function() {
      this.transitionToRoute('books', { queryParams: { secretCode: "12345" } });
    }
  }
});

controllers.books.js

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

models.book.js

import Ember from 'ember';
import DS from 'ember-data';

var Book = DS.Model.extend({
  title: DS.attr('string'),
  secret_code: DS.attr('string')
});

Book.reopenClass({
  FIXTURES: [
    {id: 1, title: "Ender's Game"},
    {id: 2, title: "War and Peace"},
    {id: 3, title: "Game of Thrones 6", secretCode: "12345"}
  ]
});

export default Book;

router.js

import Ember from 'ember';
var Router = Ember.Router.extend({
  location: 'none'
});

Router.map(function() {
  this.route('books');
});

export default Router;

routes.books.js

export default Ember.Route.extend({
  queryParams: {
    secretCode: {
      refreshModel: true
    }
  },
  model: function(params) {
    if (Ember.isPresent(params.secretCode)) {
      return this.store.query('book', { secretCode: params.secretCode });
    } else {
      return this.store.findAll('book').then(function(books){
        return books.filter(function(book) {
          return Ember.isEmpty(book.get('secretCode'));
        });
      });
    }
  }
});

server.mocks.books.js

{ 
  books: [
    { id: 1, title: "Ender's Game" },
    { id: 2, title: "War and Peace" },
    { id: 3, title: "Game of Thrones 6", secretCode: "12345" }
  ]
}

styles.app.css

body { margin: 12px 16px }

templates.application.hbs

<h1>Welcome to {{appName}}</h1>{{outlet}}
<p>{{link-to 'Non-secret books' 'books' (query-params secretCode="null")}}</p>
<p>{{link-to 'Secret book' 'books' (query-params secretCode="12345")}}</p>

<hr>
<p>{{link-to 'Home' "application"}}</p>

templates.books.hbs

<ul>
{{#each model as |book|}}
  <li>{{book.title}}</li>
{{/each}}
</ul>

twiddle.json

{
  "version": "0.4.7",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.7/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember-template-compiler.js"
  }
}