queryParams as object testing

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  queryParams:['filter'],
  filter:'',//{"filter1":"ab"},
   actions:{
    changeFilter(){
      console.log('changeFilter ',typeof this.get('filter'));     
      let k= JSON.parse(this.get('filter')); //this.get('filter');
      Ember.set(k,"filter2","Anderson");
      //this.filter.pushObject('filter2','Andy');
      this.set('filter',JSON.stringify(k));
    }
  }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  queryParams:{ filter:{ refreshModel:true}},
  model(){
    console.log(' model ',...arguments);
    return ['one'];
  },
  setupController(controller,model,params){
    this._super(...arguments);
    //console.log(' Arguments ', ...arguments);
    //console.log('params ',params);
    //if(controller.filter !== '')
    // controller.set('filter',JSON.parse(controller.filter));
    
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{filter}} - {{filter.filter2}}
<button {{action 'changeFilter'}}> Change</button>
<br>
{{outlet}}
<br>
<br>

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"
  }
}