<?php 
function workaround_views_query_alter(&$view, &$query) {
  if($view->name == 'main_page') {
    if ($_POST != array() && strpos($_POST['form_id'], 'uc_product_add_to_cart_form') !== false) {
	$tmp = explode('_', $_POST['form_id']);
	$nid = $tmp[count($tmp)-1];
	$query->add_where('0', "node.nid = %d", $nid);
    }
  }
}