我如何使用cakephp中的可拖拽行为使用来自不同表的字段来打个

function beforeValidate() {
    $return = parent::beforeValidate();

    if(isset($this->data[\'User\'][\'first_name\']) && isset($this->data[\'User\'][\'last_name\'])) {
        // assumes we\'re saving a campaign and a user at the same time w/ saveAll
        $this->data[\'Campaign\'][\'slug\'] = $this->data[\'User\'][\'first_name\'] . \' \' . $this->data[\'User\'][\'last_name\'];
    } elseif(isset($this->data[\'Campaign\'][\'user_id\'])) {
        // saving Campaign record w/ just user_id passed
        $user = $this->User->find(\'first\', array(\'conditions\'=>array(\'User.id\'=>$this->data[\'Campaign\'][\'user_id\']), \'fields\'=>array(\'User.first_name\', \'User.last_name\')));
        if($user) {
            $this->data[\'Campaign\'][\'slug\'] = $user[\'User\'][\'first_name\'] . \' \' . $user[\'User\'][\'last_name\'];
        }
    }
    return $return;
}        

Inflector::slug

$name = sprintf(\'%s %s\', $first_name, $last_name);
$slug = Inflector::slug($name);
$this->Campaign->set(\'slug\', $slug);
$this->Campaign->save();

<?php
    class User extends AppModel
    {
        var $virtualFields = array(
            \'full_name\' => \'CONCAT(User.first_name, \" \", User.last_name)\'
        );
        ...
    }
?>

<?php
    class User extends AppModel
    {
        ...
        public $actsAs = array(
            \'Sluggable\' => array(
                \'label\' => \'full_name\',
                ...
            ),
            ...
        );
    }
?>