routing

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

router\.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

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

Router.map(function() {
  this.route('foo', function() {
     this.route('bar');
  })
});

export default Router;

routes.foo.bar\.js

import Route from '@ember/routing/route';

export default class extends Route {
  model() {
    console.log('bar model hook');
    
    return new Promise((resolve) => {
      setTimeout(() => {
        resolve('bar') 
      }, 1000);
    });
  }
}

routes.foo\.js

import Route from '@ember/routing/route';

export default class extends Route {
  model() {
    console.log('foo model hook');
    
    return new Promise((resolve) => {
      setTimeout(() => {
        resolve('foo') 
      }, 1000);
    });
  }
}

templates.application\.hbs

App

<LinkTo @route="application">application</LinkTo> |
<LinkTo @route="foo">foo</LinkTo> |
<LinkTo @route="foo.bar">foo.bar</LinkTo>

<br><br>

See console when navigating...

<br><br>

{{outlet}}

templates.foo.bar\.hbs

<h2>{{@model}}</h2>

{{@outlet}}

templates.foo.loading\.hbs

Loading foo...

templates.foo\.hbs

<h1>{{@model}}</h1>

{{outlet}}

templates.loading\.hbs

Loading...

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}