Ember Bootstrap: validation state and input group

controllers.application.js

import Ember from 'ember';
import { validatePresence } from 'ember-changeset-validations/validators';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  Validations: {
    name: validatePresence(true)
  }
});

templates.application.hbs

<h1>Validation state and input group</h1>
<p>A click on the button triggers validation to be shown if button looses focus again.</p>
<BsForm @model={{changeset (hash) Validations}} as |form|>
  <form.element @property="name" as |el|>
    <div class="input-group mb-3">
      <div class="input-group-prepend">
    		<button class="btn btn-outline-secondary" type="button">Button</button>
    	</div>
  		<el.control />
    </div>
  </form.element>
</BsForm>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-bootstrap": "2.2.0",
    "ember-changeset-validations": "1.3.3",
    "ember-bootstrap-changeset-validations": "1.0.0"
  }
}