New Twiddle

components.x-editor.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: '',
  
  willDestroyElement() {
    this.get('model').rollbackAttributes();
  }
});

controllers.application.js

import Ember from 'ember';

const Model = Ember.Object.extend({
  rollbackCount: 0,
  
  rollbackAttributes() {
    this.incrementProperty('rollbackCount');
  }
});

export default Ember.Controller.extend({
  model: Model.create(),
  selected: null,
  
  select() {
    this.set('selected', this.model);
  },
  
  deselect() {
    this.set('selected', null);
  }
});

templates.application.hbs

<button onclick={{action select}}>Select</button>
<button onclick={{action deselect}}>Deselect</button>
<hr>
Model.rollbackCount: {{model.rollbackCount}}
<hr>
{{#if selected}}
	{{x-editor model=selected}}
{{/if}}

templates.components.x-editor.hbs

<form>
  <fieldset>
  	x-editor
    {{yield}}
  </fieldset>
</form>

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"
  }
}