Executing methods on Ember Data modls in template

models.article\.js

import Model, { attr } from '@ember-data/model';

export default class extends Model {
  @attr('string')
  title;
  
  @attr('string')
  body;
}

routes.application\.js

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

export default Route.extend({
  async model() {
    this.store.pushPayload({
      data: {
        id: '1',
        type: 'articles',
        attributes: {
          title: 'Example',
          body: 'Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo',
        },
      },
    });
    return this.store.peekRecord('article', '1');
  }
});

templates.application\.hbs

{{#let @model as |article|}}
  <h1>Edit article {{article.id}}</h1>

  <form>
    <div>
      <label for="title">Title:</label>
      <input
        id="title"
        value={{article.title}}
        {{on "input" (action (mut article.title) value="target.value")}}
      >
    </div>

    <div>
      <label for="body">Body:</label>
      <textarea
        id="body"
        {{on "input" (action (mut article.body) value="target.value")}}
      >{{article.body}}</textarea>
    </div>
 
    <button
      type="button"
      {{on "click" (bind article.rollbackAttributes target=article)}}
    >
      reset changes
    </button>
  </form>
{{/let}}

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",
    "ember-bind-helper": "1.0.0",
    "ember-data": "3.18.0"
  }
}