problem updating multiple related table record using save

I have user's profile split into 3 tables)one parent table linked to
two child tables(with foreign keys set to id of parent table and both
with cascade option set on delete and update). Parent table relate to
one record on the two child tables.

I have declared $hasmany on main table model
( $hasMany=array('child1', 'child2')) and &belongs to parent table on
child models. I tried to declare $hasone=array('child1', 'child2)' on
the parent model; but showed error.

My problem is when i try to edit and save a profile, a new record ia
added in the child tables instead of updating the existing record. I
tried using update, updateAll, save, saveAll. but nothing is working.

Please correct me where i went wrong. The following is my edit profile
code.

function profile(){
if (empty($this->data)) {
$this->data = $this->Ulog->read();
} else {
if ($this->Ulog->saveAll($this->data)) {
$this->Session->setFlash('Your post has been
updated.');
$this->render('index');
}
}
}

Thankx
John M

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