code: public function map($nodeList) {
      $self = $this;
  
      return $this->wrapInTransaction(function() use ($self, $nodeList) {
        forward_static_call(array(get_class($self->node), 'unguard'));
  
        $result = $self->mapTree($nodeList);
  
        forward_static_call(array(get_class($self->node), 'reguard'));
  
        return $result;
      });
    }
docs: Maps a tree structure into the database. Unguards & wraps in transaction.
  
  @param   array|\Illuminate\Support\Contracts\ArrayableInterface
  @return  boolean