問題描述

我想在 Magento 中遍歷一系列產品 ID.在循環中，我將產品的一些自定義屬性顯示為:

I want to loop over an array of product IDs in Magento. In the loop I am displaying some custom attributes of the products as:

foreach ($products as $product) {
   $model = Mage::getSingleton('catalog/product')->load($product['id']);
   echo '<br>' . $model->getCredits();
}

問題是，如果第一項的 getCredits() 值為 true，那么所有后續項都顯示 true，即使它們沒有值 true.

Problem is that if the value of getCredits() for the first item is true then all the subsequent items show true even if they do not have the value true.

但是當我使用 Mage::getModel() 而不是 Mage::getSingleton() 時，屬性值顯示正確.

But when I use Mage::getModel() instead of Mage::getSingleton(), the attribute values are displayed correct.

誰能解釋一下這個區別?

Can anyone please explain this difference?

推薦答案

Mage::getModel() 將始終為給定模型返回一個新對象:

Mage::getModel() will always return a new Object for the given model:

/**
 * Retrieve model object
 *
 * @link    Mage_Core_Model_Config::getModelInstance
 * @param   string $modelClass
 * @param   array|object $arguments
 * @return  Mage_Core_Model_Abstract|false
 */
public static function getModel($modelClass = '', $arguments = array())
{
    return self::getConfig()->getModelInstance($modelClass, $arguments);
}

Mage::getSingleton() 將檢查給定模型的對象是否已經存在，如果存在則返回.如果它不存在，它將創建一個給定模型的新對象，并將其放入已存在的注冊表中.下一次調用不會返回新對象，而是返回現有對象:

Mage::getSingleton() will check whether the Object of the given model already exists and return that if it does. If it doesn't exist, it will create a new object of the given model and put in registry that it already exists. Next call will not return a new object but the existing one:

/**
 * Retrieve model object singleton
 *
 * @param   string $modelClass
 * @param   array $arguments
 * @return  Mage_Core_Model_Abstract
 */
public static function getSingleton($modelClass='', array $arguments=array())
{
    $registryKey = '_singleton/'.$modelClass;
    if (!self::registry($registryKey)) {
        self::register($registryKey, self::getModel($modelClass, $arguments));
    }
    return self::registry($registryKey);
}

在您的情況下，您總是想要一個全新的 Product 對象/模型，因為每個產品都是獨一無二的...

In your case you always want a completely new Product object/model since every product is unique...

這篇關于Magento getSingleton() 與 getModel() 問題的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！