Magento中数据拷贝一实现

Mage_Sales_Model_Quote::setCustomer方法，有这么一行代码

Mage::helper('core')->copyFieldset('customer_account', 'to_quote', $customer, $this);

看下实现Mage_Core_Helper_Da

ta::copyFieldset

  $fields = Mage::getConfig()->getFieldset($fieldset, $root);
        if (!$fields) {
            return false;
        }

        $sourceIsArray = is_array($source);
        $targetIsArray = is_array($target);

        $result = false;
        foreach ($fields as $code=>$node) {
            if (empty($node->$aspect)) {
                continue;
            }

            if ($sourceIsArray) {
                $value = isset($source[$code]) ? $source[$code] : null;
            } else {
                $value = $source->getDataUsingMethod($code);
            }

            $targetCode = (string)$node->$aspect;
            $targetCode = $targetCode == '*' ? $code : $targetCode;

            if ($targetIsArray) {
                $target[$targetCode] = $value;
            } else {
                $target->setDataUsingMethod($targetCode, $value);
            }

            $result = true;
        }

先从配置中读取global/fieldsets/相应的节点，每个节点的格式为key为源对象中的属性名，v为配置；以下为一个实例

<prefix>
<create>1</create>
<update>1</update>
<name>1</name>
<to_quote>customer_prefix</to_quote>
<to_order>customer_prefix</to_order>
</prefix>

从源对象或数组中拷贝，如果是数组，则用key，对象则用相应的get方法，如tax_class_id，则方法为getTaxClassId