问Magento按日期排序

EN

<ewfeed_feed_products>
    <observers>
        <example_ewfeed_products>
            <type>singleton</type>
            <class>ewfeed/observer_example</class>
            <method>feedProducts</method>
        </example_ewfeed_products>
    </observers>
</ewfeed_feed_products>

static function feedProducts(Varien_Object $observer)
{
    $feed = $observer->getFeed();
    $productCollection = $observer->getProductCollection();
    $transport = $observer->getTransport();

    //lets try sorting
    $productCollection->addAttributeToSort('news_to_date', 'DESC'); 

    $originalIds = $productCollection->getAllIds();

    // any ids set here are products that will be used in the feed. they will be listed in the order of the ids in the array
    // so if you change the order it will change the order of the outputted products. you can also filter products here
    $transport->setProductIds($originalIds); // set to null to use default
}