Simple Decorator Pattern

components.my-component.js

import Ember from 'ember';
import MyModelDecorator from '../decorators/my-model';

export default Ember.Component.extend({
  decoratedPerson: Ember.computed('person', {
    get() {
      // If you needed dependency injection you would need to
      // let MyModelDecorator = Ember.getOwner(this).factoryFor('decorator:my-model');
      //   OR
      // let MyModelDecorator = Ember.getOwner(this)._lookupFactory('decorator:my-model');
      // Depending on your version of Ember.
      return MyModelDecorator.create({content: this.get('person')});
    }
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  model: Ember.computed({
    get() {
      return this.get('store').createRecord('my-model', {
        firstName: 'Bob',
        lastName: 'NoName'
      });
    }
  })
});

decorators.my-model.js

import Ember from 'ember';

export default Ember.ObjectProxy.extend({
  isAwesome: Ember.computed.equal('content.firstName', 'Jane'),
  awesomeStyle: Ember.computed('isAwesome', {
    get() {
      let style = this.get('isAwesome') ? 'background-color: gold;' : '';
      return Ember.String.htmlSafe(style);
    }
  })
});

models.my-model.js

import Model from "ember-data/model";
import attr from "ember-data/attr";

export default Model.extend({
  firstName: attr('string'),
  lastName: attr('string')
});

templates.application.hbs

<p>Try <code>Jane</code>.</p>

<input type="text" value={{model.firstName}} oninput={{action (mut model.firstName) value="target.value"}}>

{{my-component person=model}}

templates.components.my-component.hbs

<span style={{decoratedPerson.awesomeStyle}}>
  {{decoratedPerson.firstName}}
</span>
{{decoratedPerson.lastName}}
{{#if decoratedPerson.isAwesome}}
  is awesome!
{{/if}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}