tree behaviour and validation rule problem

I wrote a simple model that acts as a tree behaviour.
The model has a myfield_id field that must follow these rules:
- if parent_id is empty (root) myfield_id can't be blank
- if parent_id is not empty myfield_id must be blank (children)

So I wrote a isUnique validation rule for myfield_id. And it seems to
works if I use the baked add and edit pages.

Then I created another page that uses a javascript widget (tafelTree)
to show the tree and to drag and drop around nodes.
In the controller I created a function that receives the id and the
(new) parent id of a node as a parameter. If node id 1234 with
parent_id 5432 becomes (in javascript) a children of node 8765 my
function receives 1234-8765.
I retrieve the record with:
$category = $this->Category->find('first',
array('conditions' => array('Category.id' =>1234))
);
and try to save it with:
$ret = $this->Category->save(array('parent_id' => 8765));

This fails with a validation error for the isUnique rule.
I put a log line in the isUnique function (in cake/lib.../model.php)
to see what is the "condition" that creates the error and...

(
[or] => Array
(
[Category.myfield_id] =>
)

[Category.id !=] => 1234
)

But this is the same condition that I found when saving that record
using the edit function (with no error).
So I don't understand why there's a validation error when the
condition is the same.

Any suggestion?

Thank you

maxx

p.s. En passent... the childrenCount function doesn't work properly
with my data. It reports a number of nodes greater than the real
number. I "verified" and "reordered" my data but the results of the
function are still wrong.

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