/**
  * Set sortable attributes.
  *
  * @return array
  */
 public function defineSortableAttributes()
 {
     // Set modified first
     $attributes = array('dateUpdated' => Craft::t('Modified'));
     // Get table attributes
     $attributes = array_merge($attributes, parent::defineSortableAttributes());
     // Unset unsortable attributes
     unset($attributes['user'], $attributes['changes']);
     // Allow plugins to modify the attributes
     craft()->plugins->call('modifyAuditLogSortableAttributes', array(&$attributes));
     // Return attributes
     return $attributes;
 }