如何在cakephp上保存数据库中的select选项值

<?php
class SelectOption extends AppModel {
    public $name = 'SelectOption';
}
?>

<?php
class SelectOptionsController extends AppController {
    public $name = 'SelectOptions';

    public function add() {
        if ($this->request->is('post')) {
            $this->SelectOption->create();
            if ($this->SelectOption->save($this->request->data)) {
                $this->Session->setFlash('选项保存成功！');
                $this->redirect(array('action' => 'index'));
            } else {
                $this->Session->setFlash('选项保存失败，请重试。');
            }
        }
    }
}
?>

<?php echo $this->Form->create('SelectOption'); ?>
<?php echo $this->Form->input('value', array('label' => '选项值')); ?>
<?php echo $this->Form->end('保存'); ?>