title: Laravel4 Model primary key value is lost after insert
body: <pre><code>&lt;?php
  // Model
  class ProfileDelivery extends \Eloquent {
      protected $table = 'profile_delivery';
      protected $guarded = array();
      public $timestamps = FALSE;
  }
  
  // Somewhere
  $deliveryGuy-&gt;id = 1;
  print $deliveryGuy-&gt;id; // Prints 1
  if (!$deliveryGuy-&gt;save()) {
      throw new \Exception('Cant save .');
  }
  print $deliveryGuy-&gt;id; // Prints 0
  </code></pre>
  
  <p>Can anyone explain me why the ID value is lost?</p>