Tạo danh mục đa cấp với behavior Tree

CREATE TABLE IF NOT EXISTS `product_categories` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(150) NOT NULL,
  `parent_id` int(11) NOT NULL,
  `published` tinyint(1) NOT NULL,
  `created` datetime NOT NULL,
  `updated` datetime NOT NULL,
  `lft` int(11) NOT NULL,
  `rght` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;

<?php
class ProductCategory extends AppModel {
	var $name = 'ProductCategory';
	var $displayField = 'name';
	var $actsAs = array('Tree');
	var $validate = array(
		'name' => array(
			'notempty' => array(
				'rule' => array('notempty'),
				//'message' => 'Your custom message here',
				//'allowEmpty' => false,
				//'required' => false,
				//'last' => false, // Stop validation after this rule
				//'on' => 'create', // Limit validation to 'create' or 'update' operations
			),
		),
		'published' => array(
			'numeric' => array(
				'rule' => array('numeric'),
				//'message' => 'Your custom message here',
				//'allowEmpty' => false,
				//'required' => false,
				//'last' => false, // Stop validation after this rule
				//'on' => 'create', // Limit validation to 'create' or 'update' operations
			),
		)
	);
 
	var $belongsTo = array(
		'ParentCat' => array(
			'className' => 'ProductCategory',
			'foreignKey' => 'parent_id'
		)
	);
}
?>

var $actsAs = array('Tree');

var $belongsTo = array(
		'ParentCat' => array(
			'className' => 'ProductCategory',
			'foreignKey' => 'parent_id'
		)
	);

<?php
class ProductCategoriesController extends AppController {
 
	var $name = 'ProductCategories';
 
	function index() {
		$this->ProductCategory->recursive = 0;
		$this->set('productCategories', $this->paginate());
	}	
 
	function add() {
		if (!empty($this->data)) {
			$this->ProductCategory->create();
			if ($this->ProductCategory->save($this->data)) {
				$this->Session->setFlash(__('The product category has been saved', true));
				$this->redirect(array('action' => 'index'));
			} else {
				$this->Session->setFlash(__('The product category could not be saved. Please, try again.', true));
			}
		}
		$this->set('list_cat',$this->_find_list());
	}		
 
	function _find_list() {
		return $this->ProductCategory->generatetreelist(null, null, null, '__');
	}
}
?>

function _find_list() {
		return $this->ProductCategory->generatetreelist(null, null, null, '__');
	}

<div class="productCategories index">
	<h2><?php __('Product Categories');?></h2>
	<table cellpadding="0" cellspacing="0">
	<tr>
			<th><?php echo $this->Paginator->sort('id');?></th>
			<th><?php echo $this->Paginator->sort('name');?></th>
			<th><?php echo $this->Paginator->sort('parent_id');?></th>
			<th><?php echo $this->Paginator->sort('published');?></th>
			<th><?php echo $this->Paginator->sort('created');?></th>
			<th><?php echo $this->Paginator->sort('updated');?></th>			
			<th class="actions"><?php __('Actions');?></th>
	</tr>
	<?php
	$i = 0;	
	foreach ($productCategories as $productCategory):
		$class = null;
		if ($i++ % 2 == 0) {
			$class = ' class="altrow"';
		}
	?>
	<tr<?php echo $class;?>>
		<td><?php echo $productCategory['ProductCategory']['id']; ?>&nbsp;</td>
		<td><?php echo $productCategory['ProductCategory']['name']; ?>&nbsp;</td>
		<td><?php echo $productCategory['ParentCat']['name']; ?>&nbsp;</td>
		<td><?php echo $productCategory['ProductCategory']['published']; ?>&nbsp;</td>
		<td><?php echo $productCategory['ProductCategory']['created']; ?>&nbsp;</td>
		<td><?php echo $productCategory['ProductCategory']['updated']; ?>&nbsp;</td>		
		<td class="actions">
			<?php echo $this->Html->link(__('View', true), array('action' => 'view', $productCategory['ProductCategory']['id'])); ?>
			<?php echo $this->Html->link(__('Edit', true), array('action' => 'edit', $productCategory['ProductCategory']['id'])); ?>
			<?php echo $this->Html->link(__('Delete', true), array('action' => 'delete', $productCategory['ProductCategory']['id']), null, sprintf(__('Are you sure you want to delete # %s?', true), $productCategory['ProductCategory']['id'])); ?>
		</td>
	</tr>
<?php endforeach; ?>
	</table>
	<p>
	<?php
	echo $this->Paginator->counter(array(
	'format' => __('Page %page% of %pages%, showing %current% records out of %count% total, starting on record %start%, ending on %end%', true)
	));
	?>	</p>
 
	<div class="paging">
		<?php echo $this->Paginator->prev('<< ' . __('previous', true), array(), null, array('class'=>'disabled'));?>
	 | 	<?php echo $this->Paginator->numbers();?>
 |
		<?php echo $this->Paginator->next(__('next', true) . ' >>', array(), null, array('class' => 'disabled'));?>
	</div>
</div>

<div class="productCategories form">
<?php echo $this->Form->create('ProductCategory');?>
	<fieldset>
 		<legend><?php __('Add Product Category'); ?></legend>
	<?php
		echo $this->Form->input('name');
		echo $this->Form->input('parent_id',array('type'=>'select','options'=>$list_cat,'empty'=>'--Choose parent--'));		
		echo $this->Form->input('published');
	?>
	</fieldset>
<?php echo $this->Form->end(__('Submit', true));?>
</div>