getQty（）給予致命的錯誤在Magento 1.9

Question

我想基於產品和報價ID使用，

$quotecollection = Mage::getModel('sales/quote_item')->getCollection()->addFieldToFilter('quote_id',$quoteId)->addFieldToFilter('product_id',$product_id); 

$quotecollectionaArr = $quotecollection->getData(); 
echo $quotecollection->getQty(); 

它提供了以下錯誤獲取集合

Fatal error: Call to undefined method Mage_Sales_Model_Resource_Quote_Item_Collection::getQty() in C:\xampp\htdocs....

請幫忙。

Answer 1

您應該使用getFirstItem()

$quotecollection = Mage::getModel('sales/quote_item')->getCollection()->addFieldToFilter('quote_id',$quoteId)->addFieldToFilter('product_id',$product_id)->getFirstItem(); 
    echo $quotecollection->getQty();