isSaving

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  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('my-route', { path: '/' });
});

export default Router;

routes.my-route.js

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

export default Ember.Route.extend({
  model() {
    return rsvp.hash({ isSaving: false })
      .then(data => Ember.Object.create(data))
  },
  
  actions: {
    save(model) {
		  model.set('isSaving', true)
      setTimeout(() => model.set('isSaving', false), 1000)
    }
  }
  
});

templates.application.hbs

{{outlet}}

templates.my-route.hbs

<button {{action "save" model}}>save</button>
{{ model.isSaving }}

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"
  }
}