New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['activeSorting'],

  //activeSorting: 'hello',
  // activeSoring: [],
   activeSorting: {},

  actions: {
    clickHandler() {
      let result =[{name: 'q'}, {value: 'a'}]
      let result2 = {name: '11'}
      this.set('activeSorting', result2)
    },
    
    resetHandler() {
       //this.set('activeSorting', '')
       // this.set('activeSorting', [])
        this.set('activeSorting', {})

    }
  }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
    model: function (params) {
      console.log(params)
    },
  
      serializeQueryParam(value, urlKey, defaultValueType)    
      {
      // urlKey isn't used here, but anyone overriding
      // can use it to provide serialization specific
      // to a certain query param.
        if (defaultValueType === 'array') {
          return JSON.stringify(value);
         }
        // only type array will trigger Json.stringify by default.
        if (defaultValueType === 'null') {
          return JSON.stringify(value)
        }
        
        if (defaultValueType === 'object') {
          return JSON.stringify(value)
        }
        
        return '' + value;
      },
});

templates.application.hbs

<button {{action (action 'clickHandler')}}>set qp</button>

<button {{action (action 'resetHandler')}}>reset</button>

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}