GridFieldOrderableRows::reorderItems PHP Method

    protected function reorderItems($list, array $values, array $sortedIDs)
    {
        $sortField = $this->getSortField();
        /** @var SS_List $map */
        $map = $list->map('ID', $sortField);
        //fix for versions of SS that return inconsistent types for `map` function
        if ($map instanceof SS_Map) {
            $map = $map->toArray();
        }
        // If not a ManyManyList and using versioning, detect it.
        $isVersioned = false;
        $class = $list->dataClass();
        if ($class == $this->getSortTable($list)) {
            $isVersioned = $class::has_extension('Versioned');
        }
        // Loop through each item, and update the sort values which do not
        // match to order the objects.
        if (!$isVersioned) {
            $sortTable = $this->getSortTable($list);
            $additionalSQL = !$list instanceof ManyManyList ? ', "LastEdited" = NOW()' : '';
            foreach ($sortedIDs as $sortValue => $id) {
                if ($map[$id] != $sortValue) {
                    DB::query(sprintf('UPDATE "%s" SET "%s" = %d%s WHERE %s', $sortTable, $sortField, $sortValue, $additionalSQL, $this->getSortTableClauseForIds($list, $id)));
                }
            }
        } else {
            // For versioned objects, modify them with the ORM so that the
            // *_versions table is updated. This ensures re-ordering works
            // similar to the SiteTree where you change the position, and then
            // you go into the record and publish it.
            foreach ($sortedIDs as $sortValue => $id) {
                if ($map[$id] != $sortValue) {
                    $record = $class::get()->byID($id);
                    $record->{$sortField} = $sortValue;
                    $record->write();
                }
            }
        }
        $this->extend('onAfterReorderItems', $list);
    }