I'm using the TreeBehaviour on a Page model and I noticed that when
records are ADDED with no parent selected they are saved in the
database with a parent_id of 0, but when records are EDITED and given
no parent they saved with NULL as the parent_id.
My add and edit controller logic is almost identical:
function admin_add() {
if (empty($this->data)) {
$this->set('pages',$this->Page-
>generatetreelist(null,'{n}.Page.id','{n}.Page.name',' - '));
}
else {
if($this->Page->save($this->data)) {
$this->redirect(array('action' => 'index'),
null, true);
}
}
}
function admin_edit($id) {
if (empty($this->data)) {
$this->Page->id = $id;
$this->data = $this->Page->read();
$this->set('pages',$this->Page->generatetreelist('id
!='.
$id,'{n}.Page.id','{n}.Page.name',' - ')); // ensures itself isn't an
option as a parent
}
else {
$this->Page->save($this->data);
$this->redirect(array('action' => 'index'), null, true);
}
}
---------------------
here's the add view:
<?php echo $form->create('Page') ?>
<?php echo $form->input('name') ?>
<?php echo $form->input('body_html') ?>
<?php echo $form->input('parent_id',array('type'=>'select','options'=>
$pages,'empty' => true)) ?>
<?php echo $form->input('active') ?>
<?php echo $form->end('Save') ?>
---------------------
and the edit view:
<?php echo $form->create('Page') ?>
<?php echo $form->hidden('id')?>
<?php echo $form->input('name') ?>
<?php echo $form->input('body_html') ?>
<?php echo $form->input('parent_id',array('type'=>'select','options'=>
$pages, 'selected'=>$this->data['Page']['parent_id'],'empty'=>true )) ?
>
<?php echo $form->input('active') ?>
<?php echo $form->end('Save')?>
This causes a problem where the order changes if a recorded is edited,
as the parent changes from 0 to NULL.
Any ideas how I can avoid this and ensure all new records without a
parent are given NULL instead of 0 as their parent_id?
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