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<?php defined('SYSPATH') or die('No direct script access.');
/**
* Object Relational Mapping (ORM) "tree" extension. Allows ORM objects to act
* as trees, with parents and children.
*
* $Id$
*
* @package Core
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class ORM_Tree_Core extends ORM {
// Name of the child
protected $children;
// Parent keyword name
protected $parent_key = 'parent_id';
/**
* Overload ORM::__get to support "parent" and "children" properties.
*
* @param string column name
* @return mixed
*/
public function __get($column)
{
if ($column === 'parent')
{
if (empty($this->related[$column]))
{
// Load child model
$model = ORM::factory(inflector::singular($this->children));
if (isset($this->object[$this->parent_key]))
{
// Find children of this parent
$model->where($this->parent_key, $this->object[$this->parent_key])->find();
}
$this->related[$column] = $model;
}
return $this->related[$column];
}
elseif ($column === 'children')
{
if (empty($this->related[$column]))
{
$model = ORM::factory(inflector::singular($this->children));
if ($this->children === $this->table_name)
{
// Load children within this table
$this->related[$column] = $model
->where($this->parent_key, $this->object[$this->primary_key])
->find_all();
}
else
{
// Find first selection of children
$this->related[$column] = $model
->where($this->foreign_key(), $this->object[$this->primary_key])
->where($this->parent_key, NULL)
->find_all();
}
}
return $this->related[$column];
}
return parent::__get($column);
}
} // End ORM Tree
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