在Magento中添加過濾器

Question

如何將此過濾器添加到此代碼？ ================================================== ===============

$category_model = Mage::getModel('catalog/category')->load(55); 
$collection = Mage::getResourceModel('catalog/product_collection'); 
$collection->addCategoryFilter($category_model);

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我只想顯示庫存產品，如何使用以下代碼Magento做到這一點

Answer 1

有現貨嗎？

來自答案的代碼：

$category_model = Mage::getModel('catalog/category')->load(55); 
$productCollection = Mage::getResourceModel('catalog/product_collection');
$productCollection->addCategoryFilter($category_model);
Mage::getSingleton('cataloginventory/stock')
    ->addInStockFilterToCollection($productCollection);
echo "<pre>";print_r($productCollection->getData());