Yet another Query Params bug #14438

grandparent.parent.child.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model () {
    return new Em.RSVP.Promise(setTimeout)
  }
});

grandparent.parent.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['foo', 'bar'],
  
  foo: 'FOO',
  bar: 'BAR'
});

grandparent.parent.loading.template.hbs

Loading...

grandparent.parent.template.hbs

<p>
  This issue has been reported as <a href="https://github.com/emberjs/ember.js/issues/14438">#14438</a>.
</p>

<img style="float: right; width: 150px; height: 150px; margin: 0 0 1rem 1rem;" src="http://i.imgur.com/8tDKnZk.png" alt="impossiburu">

<p>
  Type into both fields and see how query params reset each other:
</p>
  
<p>
  {{input value=foo}}
  {{input value=bar}}
</p>

<p>
  Here are the minimal prerequisites to reproduce this issue:
</p>

<ul>
  <li>There are three nested routes involved: <code>grandparent.parent.child</code>, but not all of them have to be defined.</li>
  <li>The <code>parent</code> controller must have a query param (<code>foo</code>).</li>
  <li>There must be another query param (<code>bar</code>): either in the same route or the child route.</li>
  <li>
  Updating <code>bar</code> causes <code>foo</code> to reset to its default value!</li>
  <li>The child route's model hook must return a pending promise.</li>
  <li>There must be a loading template on the child level: <code>grandparent.parent.loading</code>. At the same time, the <code>&#123;&#123;outlet}}</code> in the <code>parent</code> route is not required!</li>
  <li>The <code>grandparent</code> route must have a dynamic segment.</li>
</ul>



<p>
  Remove any of these prerequisites and the bug won't manifestate.
</p>
  
{{outlet}}

index.route.js

import Ember from 'ember';

export default Ember.Route.extend({
	redirect() {
    this.transitionTo('grandparent.parent.child', 1);
  }
});

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('grandparent', {path: 'grandparent/:bax'}, function () {
    this.route('parent', function () {
      this.route('child');
    });
  });
});

export default Router;

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

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": {}
}