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我尝试使用事件“controller_predispatch_checkout_cart_index”并使用此功能。仅在我登录后提及,并直接转到页面/结帐/购物车,它不起作用,但重新加载页面后它确实起作用......发生了什么???

    const FREE_CODE = 'freeshipping_freeshipping';

    public function predispatchCart($observer)
    {
        $quote      = Mage::getSingleton('checkout/cart')->getQuote();



        if(! $quote->getShippingAddress()->getShippingMethod())
        {
            $quote->getShippingAddress()
                    ->setShippingMethod(self::FREE_CODE);
                    //->save();
            return true;
        }
   }
}
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