How to highlight selected address?

If the user clicks the li entry, it triggers the useThisAddress action, which sets isSelected in the address object to true. From there bind-attr takes care of setting the appropriate class (ie `border-black').

Is this the right way to go about this? Or is there a better way to write this?

Below code works. However, I am a bit uncertain about setting isSelected true on the address object, since it isn't a real property in the address object model.

// Controller
import Ember from 'ember';

export default Ember.Controller.extend({
  active: null,

  actions: {
    useThisAddress: function(address) {
      address.set('isSelected', true);
      var active = this.get('active');
      if (active) {
        active.set('isSelected', false);
      }
      this.set('active', address);
    }
  }
})

// Template
<ul>
  {{#each address in model}}
    <li {{bind-attr class='address.isSelected:border-black'}} {{action 'useThisAddress' address}}>
      Address: {{address.address1}} {{address.address2}}, {{address.city}}, {{address.postalCode}}
    </li>
  {{/each}}
</ul>