Actions in parent

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({
  actions: {
    toggle() {
      console.log('Hello from controller');
      this.send('toggleAppView');
    }
  }
});

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

export default Router;

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel() {
    this.transitionTo('parent.child');
  }
});

routes.parent.child.js

import Ember from 'ember';

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

routes.parent.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    toggleAppView() {
      console.log('Hola from parent');
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.parent.child.hbs

<button {{action "toggle"}}>
  Click me
</button>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}