Child Query Params

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  queryParams: ['myParam'],
  myParam: null
});

controllers.index.js

import Ember from 'ember';

export default Ember.Controller.extend({
  myParam: null
});

controllers.parent-route.index.js

import Ember from 'ember';

export default Ember.Controller.extend({
  myParam: null,
});

controllers.parent-route.js

import Ember from 'ember';

export default Ember.Controller.extend({
  //queryParams: ['myParam'],
  myParam: null
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none'
});

Router.map(function() {
  this.route('parent-route', function() {
    this.route('child-route');
  });
});

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  setupController(controller, model) {
    let childController = this.controllerFor('parent-route.index');
    childController.set('myParam', controller.get('myParam'));
  }
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
});

routes.parent-route.index.js

import Ember from 'ember';

export default Ember.Route.extend({
 
});

routes.parent-route.js

import Ember from 'ember';

export default Ember.Route.extend({
 
});

templates.application.hbs

Parent Route param: {{myParam}}
<br><br>
{{outlet}}

<br><br>
{{#link-to 'application' (query-params myParam='TEST')}}
		Test Query Param
{{/link-to}}

templates.index.hbs

The param value is: {{myParam}}

templates.parent-route.hbs

Parent Route param: {{myParam}}
<br><br>
{{outlet}}

templates.parent-route.index.hbs

The param value is: {{myParam}}

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}