/**
* Filter collection by removing not available product types
*
* @param \Magento\Framework\Model\Resource\Db\Collection\AbstractCollection $collection
* @return \Magento\Framework\Model\Resource\Db\Collection\AbstractCollection
*/
public function applySalableProductTypesFilter($collection)
{
$productTypes = $this->_salesConfig->getAvailableProductTypes();
foreach ($collection->getItems() as $key => $item) {
if ($item instanceof \Magento\Catalog\Model\Product) {
$type = $item->getTypeId();
} elseif ($item instanceof \Magento\Sales\Model\Order\Item) {
$type = $item->getProductType();
} elseif ($item instanceof \Magento\Quote\Model\Quote\Item) {
$type = $item->getProductType();
} else {
$type = '';
}
if (!in_array($type, $productTypes)) {
$collection->removeItemByKey($key);
}
}
return $collection;
}