/**
  * @param FilterInterface $filter
  */
 protected function compileFilterOrderings(FilterInterface $filter)
 {
     foreach ($filter->getOrderings() as $ordering) {
         list($property, $isAscending) = $ordering;
         if ($this->isSkipProperty($property)) {
             continue;
         }
         $this->compileOrdering($property, $isAscending);
     }
 }