Pass hash promise to transition

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions:{
    goTest(){
      let hashPrms = {
                a: Ember.RSVP.resolve({id: 1}),
                b: Ember.RSVP.resolve({posts: [{id: 1, title: 'title0'}, {id: 2, title: 'title1'}]})
        };      
      this.transitionToRoute('test', Ember.RSVP.hash(hashPrms));      
    }
  }
});

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('test', {path: '/test/:a.id/:b.posts'});  
});

export default Router;

routes.test.js

import Ember from 'ember';

export default Ember.Route.extend({
  model(params){
    return params;
  }
});

templates.application.hbs

<button {{action 'goTest'}}>Go Test</button>
{{outlet}}

templates.test.hbs

<h1>This is test page</h1>
{{log model.b}}

twiddle.json

{
  "version": "0.9.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.0",
    "ember-template-compiler": "2.6.0"
  }
}