Magento模型集合 - 保存数据

Question

所以我使用以下代码加载了一系列产品:

$magento_time= 'some time string';
$collection = Mage::getModel('catalog/product')->getCollection();
$collection->addFieldToFilter(array(
    array('attribute'=> 'updated_at', 'gt'=> date('Y-m-d H:i:s', strtotime($magento_time))),
));    
$collection->save();

并在保存时收到此错误:

Warning: Invalid argument supplied for foreach()  in /var/www/magento/app/code/core/Mage/Eav/Model/Entity/Abstract.php on line 970

#0 /var/www/magento/app/code/core/Mage/Eav/Model/Entity/Abstract.php(970): mageCoreErrorHandler(2, 'Invalid argumen...', '/var/www/magent...', 970, Array)
#1 /var/www/magento/app/code/core/Mage/Eav/Model/Entity/Abstract.php(925): Mage_Eav_Model_Entity_Abstract->_collectSaveData(Object(Mage_Catalog_Model_Product))
#2 /var/www/magento/app/code/core/Mage/Core/Model/Abstract.php(251): Mage_Eav_Model_Entity_Abstract->save(Object(Mage_Catalog_Model_Product))
#3 /var/www/magento/app/code/core/Mage/Eav/Model/Entity/Collection/Abstract.php(845): Mage_Core_Model_Abstract->save()
#4 /var/www/magento/app/code/local/MyModule/controllers/IndexController.php(16): Mage_Eav_Model_Entity_Collection_Abstract->save()
#5 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(376): MyModule_IndexController->sayHelloAction()
#6 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(248): Mage_Core_Controller_Varien_Action->dispatch('sayHello')
#7 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Front.php(158): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#8 /var/www/magento/app/Mage.php(459): Mage_Core_Controller_Varien_Front->dispatch()
#9 /var/www/magento/index.php(68): Mage::run()
#10 {main}

如何将产品加载到集合后将其保存回数据库？

Answer 1

更改以下内容对我有用:

手动设置当前商店:

Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

独立保存每个集合.

foreach ($collection as $entry) {
  $entry->save();
}

编辑:

请注意,自从我2年前第一次提出这个问题以来,Magento API发生了重大变化 - 这个答案可能不再适用.