Route-async

classes.profile\.js

import { tracked } from '@glimmer/tracking';

class ProfileActions {
  @tracked profile = null;
  
	getUpdateProfile(/* profileId */) {
		// API call done here
    this.profile = new Promise((resolve) => {
      const profile = {
				firstname: 'harry',
				lastname: 'potter' 			
			};
      
      setTimeout(() => {
        resolve(profile);
      }, 1000);
    });
    
    return this.profile;
  }

  get profile() {
    return this.profile;
  }
 } 
 
// We do this so we can "mimic" service behavior the way they're instantiated 
// in Ember world [e.g. - actions: profileActions(...) instead of directly exposing class] 
export default function profileActions() { 
  return new ProfileActions(...arguments); 
} 

components.suspense\.js

import Ember from 'ember';
import { getOwner } from '@ember/application';
import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { assert } from '@ember/debug';

/**
 * This is the suspense component which be used to by container components when making API calls in a component.
 * This component handles server side rendering issues and loading and error states out of the box for the consumer
 * @param {Function|object} [promise] Required promise for the component to render the loading, success and error state
 * @param {boolean} [blockRender] Default is false. Used for deciding if the fastboot server should wait for the API call to complete
 * ...
 * @example
 *   <Suspense
 *     @promise={{this.promise}}
 *     @blockRender={{false}}
 *     as |task|
 *   >
 *     {{#if task.isLoading}}
 *       Loading...
 *     {{else if task.isSuccess}}
 *       {{task.data.userRequest.name}}: {{task.data.userRequest.time}}
 *     {{else if task.isError}}
 *       Error occurred: {{task.errorReason}}
 *     {{/if}}
 *   </Suspense>
 */

class Task {
  @tracked data = null;
  @tracked errorReason = null;
  @tracked isLoading = false;

  get isError() {
    return Boolean(this.errorReason);
  }

  get isSuccess() {
    return Boolean(this.data);
  }
}

export default class Suspense extends Component {
  constructor() {
    super(...arguments);

    // Recommended way to get the service in the addons and not forcing fastboot for every consuming application
    // https://ember-fastboot.com/docs/addon-author-guide#accessing-the-fastboot-service
    this.fastboot = getOwner(this).lookup('service:fastboot');
    this.blockRender = this.args.blockRender || false;

    assert(
      'ember-cli-fastboot dependency should be installed if we want to block render',
      !(this.blockRender && !this.fastboot)
    );
  }

  get data() {
    const blockRender = this.blockRender;
    const promiseArg = this.args.promise;
    const task = new Task();
    const promise =
      typeof promiseArg === 'function' ? promiseArg() : promiseArg;

    if (this.promise === promise) {
      return this.task;
    }

    this.task = task;
    this.promise = promise;

    task.isLoading = true;

    if (blockRender && this.fastboot.isFastBoot) {
      // https://github.com/ember-fastboot/ember-cli-fastboot#delaying-the-server-response
      this.fastboot.deferRendering(promise);
    }

    promise.then(
      (payload) => {
        task.data = payload;
        task.isLoading = false;
      },
      (e) => {
        task.errorReason = e;
        task.isLoading = false;
        // https://github.com/emberjs/ember.js/issues/15569
        if (!Ember.testing) {
          throw e;
        }
      }
    );

    return task;
  }
}

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('child');
});

export default Router;

routes.application\.js

import Route from '@ember/routing/route';
import Profile from '../classes/profile';
import { inject as service } from '@ember/service';
import RSVP from 'rsvp';

export default class Application extends Route {
  @service router

  init() {
		this.profile = new Profile();
  }

  model(params, transition) {
    console.log(transition);
    console.log(this.router);
    const profile = this.profile.getUpdateProfile();
  
    // Check for isBrowser check to see if the call is made over bigPipe mode
		return { profile };
  }
}

routes.child\.js

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

export default Route.extend({
  model(pararms, transition) {
    console.log(transition.to.name);
    console.log(this.routeName);
    const parentApplication = this.modelFor('application');

    return RSVP.hash({
      ...parentApplication
    });
  }
});

templates.child\.hbs

<p> In child </p>

templates.components.suspense\.hbs

{{yield this.data}}

templates.parent\.hbs

<h1>Welcome to {{this.appName}}</h1>

<Suspense
 @promise={{model.profile}}
 @blockRender={{false}}
 as |task|
>
 {{#if task.isLoading}}
   Loading...
 {{else if task.isSuccess}}
   {{task.data.firstname}} {{task.data.lastname}}
 {{else if task.isError}}
   Error occurred: {{task.errorReason}}
 {{/if}}
</Suspense>

<br>
<br>
{{outlet}}
<br>
<br>

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"
  }
}