New Twiddle

controllers.application.js

import Ember from 'ember';

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

controllers.senders.js

import Ember from 'ember';

export default Ember.Controller.extend({
  sender: Ember.inject.controller('senders.sender'),

  selectedDomain: Ember.computed('sender.model.sender', function() {
    return this.get('sender.model.sender');
  }),
});

controllers.senders.sender.js

import Ember from 'ember';

export default Ember.Controller.extend({
    queryParams: ['interval_days'],
    interval_days: 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('senders', function() {
    this.route('sender', { path: ':sender' }, function() {
      this.route('known');
    });
  });
  
});

export default Router;

routes.senders.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  redirect(model) {
    let sender = this.paramsFor('senders.sender')['sender'];
    if (! sender) {
      sender = (model || [])[0];
    }
    this.transitionTo('senders.sender.known', sender);
  },
});

routes.senders.js

import Ember from 'ember';
import RSVP from 'rsvp';

export default Ember.Route.extend({
  model() {
    return new RSVP.Promise(function(resolve) {
      Ember.run.later(function() {
        resolve(['sender1', 'sender2', 'sender3']);
      }, 1000);
    });
  },
});

routes.senders.sender.js

import Ember from 'ember';

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

routes.senders.sender.known.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    const params = this.paramsFor('senders.sender');
    console.log(params);
    return params.interval_days;
  },
});

templates.application.hbs

<div>{{link-to 'senders' 'senders'}}</div>
<div>{{#link-to 'senders.sender.known' 'sender2'}}a particular sender{{/link-to}}</div>
<br>
<br>
{{outlet}}
<br>
<br>

templates.senders.hbs

<div>selectedDomain: {{selectedDomain}}</div>

{{outlet}}

templates.senders.sender.known.hbs

interval_days: {{model}}

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}