LevelBehavior.php
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<?php
namespace backend\behaviors;
use yii\base\Behavior;
use yii\db\ActiveRecord;
/**
* Class LevelBehavior
*
* @package artbox\catalog\behaviors
*/
class LevelBehavior extends Behavior
{
public $levelField = 'level';
public $parentIdField = 'parent_id';
/**
* @inheritdoc
*/
public function events()
{
return [
ActiveRecord::EVENT_BEFORE_INSERT => 'beforeSave',
ActiveRecord::EVENT_BEFORE_UPDATE => 'beforeSave',
];
}
public function beforeSave($event)
{
/**
* @var ActiveRecord $owner
*/
$levelField = $this->levelField;
$parentIdField = $this->parentIdField;
$owner = $this->owner;
if (empty($owner->$parentIdField) && $owner->$parentIdField == 0) {
$owner->$levelField = 0;
} else {
$parent = $owner::findOne($owner->$parentIdField);
$owner->$levelField = (int) $parent->$levelField + 1;
}
}
}