Magento - 如何获得具有类别的产品

Question

我需要创建的最后4个产品属于某个类别。 我使用此代码获取所有产品并按创建日期对其进行排序，但它会返回产品，这些产品也不在任何类别中，有什么建议？谢谢！

$storeId = Mage::app()->getStore()->getId(); 
    $products = Mage::getModel('catalog/product') 
        ->getCollection() 
        ->addStoreFilter($storeId) 
        ->addAttributeToSelect('*') 
        ->addAttributeToSort('created_at', 'desc') 
        ->setPageSize(4); 
    Mage::getSingleton('catalog/product_status')->addVisibleFilterToCollection($products); 
    Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($products); 

Answer 1

$_rootcatID = Mage::app()->getStore()->getRootCategoryId(); 

$_testproductCollection = Mage::getResourceModel('catalog/product_collection') 
->joinField('category_id','catalog/category_product','category_id','product_id=entity_id',null,'left') 

->addAttributeToFilter('category_id', array('neq' => 0)) 

->addAttributeToSelect('*'); 
$_testproductCollection->load();