title: How to repeat object properties in angular ui-select-choices?
body: <p>I have an object as </p>
  
  <pre><code>{
      key1: value1,
      key2: value2
  }
  </code></pre>
  
  <p>How will repeat this in <code>ui-select-choices</code>? I tried a few things but nothing worked as</p>
  
  <pre><code>&lt;ui-select ng-model="selectedChoice" theme="select2"&gt;
      &lt;ui-select-match placeholder="{{'select_product' | translate}}" allow-clear="true"&gt;
          &lt;span ng-bind="$select.selected"&gt;&lt;/span&gt;
      &lt;/ui-select-match&gt;
      &lt;ui-select-choices repeat="key as (key, value) in (productList | filter: $select.search)"&gt;
          &lt;span&gt;{{::key}}&lt;/span&gt;
      &lt;/ui-select-choices&gt;
  &lt;/ui-select&gt;
  </code></pre>