/**
  * @param   int|Term  $parentTerm
  * @return  $this
  */
 public function setParentTerm($parentTerm = 0)
 {
     if ($parentTerm instanceof Term) {
         $this->parentTermId = $parentTerm->getId();
     } else {
         $this->parentTermId = (int) $parentTerm;
     }
     return $this;
 }