/**
* Treat "order by" items as attributes to sort
*
* @return Mage_Tag_Model_Resource_Product_Collection
*/
protected function _renderOrders()
{
if (!$this->_isOrdersRendered) {
parent::_renderOrders();
$orders = $this->getSelect()->getPart(Zend_Db_Select::ORDER);
$appliedOrders = array();
foreach ($orders as $order) {
$appliedOrders[$order[0]] = true;
}
foreach ($this->_orders as $field => $direction) {
if (empty($appliedOrders[$field])) {
$this->_select->order(new Zend_Db_Expr($field . ' ' . $direction));
}
}
}
return $this;
}
