public function ajaxProcessUpdateGroupsPositions()
 {
     $way = (int) Tools::getValue('way');
     $id_attribute_group = (int) Tools::getValue('id_attribute_group');
     $positions = Tools::getValue('attribute_group');
     $new_positions = array();
     foreach ($positions as $k => $v) {
         if (count(explode('_', $v)) == 4) {
             $new_positions[] = $v;
         }
     }
     foreach ($new_positions as $position => $value) {
         $pos = explode('_', $value);
         if (isset($pos[2]) && (int) $pos[2] === $id_attribute_group) {
             if ($group_attribute = new AttributeGroup((int) $pos[2])) {
                 if (isset($position) && $group_attribute->updatePosition($way, $position)) {
                     echo 'ok position ' . (int) $position . ' for group attribute ' . (int) $pos[2] . '\\r\\n';
                 } else {
                     echo '{"hasError" : true, "errors" : "Can not update group attribute ' . (int) $id_attribute_group . ' to position ' . (int) $position . ' "}';
                 }
             } else {
                 echo '{"hasError" : true, "errors" : "This group attribute (' . (int) $id_attribute_group . ') can t be loaded"}';
             }
             break;
         }
     }
 }