New Twiddle

controllers.about.js

import Ember from 'ember';

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

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  actions: {
    test() {
			this.transitionToRoute('about', {
        queryParams: {
          fooQuery: 'sd',
          objFoo: {
            name: 'slelva'
          }
        }
      })
    }
  }
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('home')
  this.route('about')
  this.route('contact')
});

export default Router;

routes.about.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    debugger
    return { adasd: 'asdasd' }
  },
  
  serializeQueryParam() {
    debugger
    return JSON.stringify({name: 'seva'});
  },
  
  deserializeQueryParam() {

    debugger
  }
});

templates.about.hbs

<h1>About</h1>

{{fooQuery}}

{{objFoo.name}}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#link-to "home"}}Home{{/link-to}}
{{!--#link-to "about" (query-params fooQuery="bar" objFoo=(hash name="barrrr"))}}About{{/link-to --}}
<button onclick={{action "test"}}>About</button>
{{#link-to "contact"}}Contact{{/link-to}}
{{outlet}}
<br>
<br>

templates.contact.hbs

<h1>Contact</h1>

templates.home.hbs

<h1>Home</h1>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}