Fix(Core): update classname generation method (#1024)

Author: stonebuzz

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fix drag and drop
 - Increased the maximum length of the language column to support longer locale codes
 - Fix left side menu url
+- Fix purge
 
 ## [1.22.1] - 2025-10-10
 

inc/container.class.php

@@ -845,8 +845,7 @@ public static function preItemPurge($item)
         foreach ($founded_containers as $container) {
             $itemtypes = json_decode($container['itemtypes']);
             if (in_array($itemtype, $itemtypes)) {
-                $classname = 'PluginFields' . $itemtype . getSingular($container['name']);
-                $classname = preg_replace('/s{2}$/i', 's', $classname); // in case name ends with 'ss' remove last 's'
+                $classname = self::getClassname($itemtype, $container['name']);
                 $fields    = new $classname();
                 $fields->deleteByCriteria(['items_id' => $item->fields['id']], true);
             }