I suggest adding the following method to extract the id of the related products
in administrator / com_virtuemart / models / product.php
function getProductRelatedIds ($product_id) {
if (empty($product_id)) {
return array();
}
$db = JFactory::getDBO ();
$db->setQuery (' SELECT field.`custom_value` FROM `#__virtuemart_customs` AS C LEFT JOIN `#__virtuemart_product_customfields` AS field ON C.`virtuemart_custom_id` = field.`virtuemart_custom_id` WHERE `virtuemart_product_id` ='. (int)$product_id .' AND `field_type` = "R"' );
return $db->loadResultArray ();
}
I think it is useful to know immediately what products are related and may be used in the detail page without using the $ field-> display