保存yii 1下拉列表中的另一个字段值而不是id

class ExampleModel extends CActiveRecord
{
    public $another_field;
    
    // ...
}

echo $form->dropDownList($model, 'another_field', $listData, array('prompt' => '请选择'));

public function actionCreate()
{
    $model = new ExampleModel;
    
    if(isset($_POST['ExampleModel']))
    {
        $model->attributes = $_POST['ExampleModel'];
        $model->another_field = $_POST['ExampleModel']['another_field'];
        
        if($model->save())
        {
            // 保存成功
        }
    }
    
    $this->render('create', array('model' => $model));
}