parent-controller-query-params

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

controllers.parent.child.js

import Ember from 'ember';

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

controllers.parent.js

import Ember from 'ember';

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

  foo: 'default value for foo',
  computedFoo: Ember.computed('foo', function() {
    return this.get('foo') + ' with some computation applied';
  })
  
});

router.js

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

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

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

});

export default Router;

routes.parent.child.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  model(params, transition) {
    return this.paramsFor('parent');
  }

});

routes.parent.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  queryParams: {
    foo: {
      refreshModel: true
    }
  }
  
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{outlet}}
<br>
{{#link-to 'parent.child'}}Child route{{/link-to}}
<br>
{{#link-to 'parent.child' (query-params foo='bar')}}Child route w params{{/link-to}}

templates.parent.child.hbs

<h3>Child</h3>
foo: {{model.foo}}
<br>
computedFoo: {{model.computedFoo}}
<br>

templates.parent.hbs

<h3>Parent</h3>
foo: {{foo}}
<br>
computedFoo: {{computedFoo}}
<br>
{{outlet}}

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"
  }
}