Illuminate\Database\Eloquent\Model::getArrayableRelations PHP Method

    protected function getArrayableRelations()
    {
        return $this->getArrayableItems($this->relations);
    }

 /**
  * @return array
  */
 protected function getArrayableRelations()
 {
     $result = parent::getArrayableRelations();
     // To fix #17 when converting tree to json falling to infinite recursion.
     unset($result['parent']);
     return $result;
 }