title: Angular ng-model Input from rootScope
body: <p>I just ran into a simple problem with angular. 
  I have an Input field with a placeholder "Username".
  If a User is selected and thus available in the $rootScope, the ng-model is displayed. </p>
  
  <p>This works so far...</p>
  
  <pre><code> input type="text" placeholder="Username..." ng-model="user.name + user.id"/&gt;
  </code></pre>
  
  <p><strong>Current Output in the View:</strong></p>
  
  <pre><code>Username12
  </code></pre>
  
  <p><strong>What I want to be the Output is:</strong></p>
  
  <pre><code>Username (12)
  </code></pre>
  
  <p>Does anyone know how to achieve this?</p>
  
  <p>Thanks in advance!</p>