php – Observer不保存订单

我构建了一个监听sales_convert_quote_to_order事件的观察者.事件被触发,我只想为订单的属性添加值.该属性已设置 – 打印在日志中 – 但magento不保存订单.我做错了什么？

Observer.PHP

public function addLangToOrder($observer){
        Mage::log('catching convert_quote_to_order_after');
        $order = $observer->getEvent()->getorder();
        $order->setCustomerLanguage(Mage::app()->getStore()->getCode());
        $order->save();
        Mage::log($order->getCustomerLanguage());
    }

config.xml中

<events>
    <sales_convert_quote_to_order>
        <observers>
            <accustomer>
                <type>singleton</type>
                <class>Ac_Customer_Model_Observer</class>
                <method>addLangToOrder</method>
            </accustomer>
        </observers>
    </sales_convert_quote_to_order>
</events>

我通过安装脚本添加了属性customer_language

$customer_lang = 'customer_language';
$installer->addAttribute('order',$customer_lang,array('type'=>'varchar'));

customer_language列存在于sales_flat_order表中.但它没有得到保存.

我正在使用Magento 1.4.1.1

<config>
    <!-- : -->
    <global>
        <fieldsets>
            <sales_convert_quote>
                <customer_language><to_order>*</to_order></customer_language>
            </sales_convert_quote>
        </fieldsets>
    </global>
    <!-- : -->
</config>