var users = [
    { id: 1, firstName: 'John', lastName: 'Doe' },
    { id: 2, firstName: 'Jane', lastName: 'Doe' },
    { id: 3, firstName: 'Bob', lastName: 'Turner' }
];

<ol class="nya-bs-select" ng-model="user">
  <li nya-bs-option="option in users track by option.id">
    <a>
        <span>{{option.firstName}}</span>
        <span class="glyphicon glyphicon-ok check-mark"></span>
    </a>
  </li>
</ol>

Selected User: {{user | json}}

<ol class="nya-bs-select" ng-model="userId">
  <li nya-bs-option="option in users" data-value="option.id">
    <a>
        <span>{{option.firstName}}</span>
        <span class="glyphicon glyphicon-ok check-mark"></span>
    </a>
  </li>
</ol>

<!-- user object is not available here, we only have userId -->
Selected User: {{user | json}}