need help with datamapper orm and nestedsets

[eluser]kev[/eluser]
Ok I think i'm finally close to this !!

Check my code below

Code:

$tree = new Category();
  $tree->select_root(1);
  $tree->get_root();
   $tree->get_by_id(5); // The id of the node i want to use as parent
  
// Here I assign the child passing the $tree object as a paramter to the new_first_child() method
  $child = new Category();
  $child->title = 'First Sub sub Level';
  $child->new_first_child($tree);

and this produce the result below :

Code:

First level
    First Sub Level
        First Sub sub Level

Am I correct with this code?