Query param weird example v2

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  nested: {
   foo: 'bar' 
  },
  queryParams: ['nested.foo']
});

routes.application.js

import Ember from 'ember';
const {get, set} = Ember
const countObj = {count: 0}
export default Ember.Route.extend({
  
queryParams: {
  'nested.foo': {
    // By default, controller query param properties don't
    // cause a full transition when they are changed, but
    // rather only cause the URL to update. Setting
    // `refreshModel` to true will cause an "in-place"
    // transition to occur, whereby the model hooks for
    // this route (and any child routes) will re-fire, allowing
    // you to reload models (e.g., from the server) using the
    // updated query param values.
    refreshModel: true,

    // By default, the query param URL key is the same name as
    // the controller property name. Use `as` to specify a
    // different URL key.
    as: 'foobar'
  }
},
  _optionsForQueryParam (qp) {
     const queryParams = get(this, 'queryParams')
    return get(queryParams, qp.urlKey) || get(queryParams, qp.prop) || queryParams[qp.urlKey] || queryParams[qp.prop] || {}

  },
  
    model (params) {
        console.log('witness', params)
        set(countObj , 'count', countObj.count + 1)
        return params
  },
  
  setupController (controller, model) {
   	this._super(controller, model)
 		controller.countObj = countObj
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{nested.foo}}
{{countObj.count}}
{{outlet}}
<br>
<br>

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"
  }
}