MDL-69690 mod_workshop: Fix fieldname for workshop.

mod/workshop/classes/grades/gradeitems.php

@@ -26,6 +26,8 @@ declare(strict_types = 1);
 
 namespace mod_workshop\grades;
 
+use core_grades\component_gradeitems;
+use core_grades\local\gradeitem\fieldname_mapping;
 use \core_grades\local\gradeitem\itemnumber_mapping;
 
 /**
@@ -35,7 +37,7 @@ use \core_grades\local\gradeitem\itemnumber_mapping;
  * @copyright Andrew Nicols <[email protected]>
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class gradeitems implements itemnumber_mapping {
+class gradeitems implements itemnumber_mapping, fieldname_mapping {
     /**
      * Return the list of grade item mappings for the workshop.
      *
@@ -47,4 +49,24 @@ class gradeitems implements itemnumber_mapping {
             1 => 'grading',
         ];
     }
+
+    /**
+     * Get the suffixed field name for an activity field mapped from its itemnumber.
+     *
+     * For legacy reasons, the first itemnumber has no suffix on field names.
+     *
+     * @param string $component The component that the grade item belongs to
+     * @param int $itemnumber The grade itemnumber
+     * @param string $fieldname The name of the field to be rewritten
+     * @return string The translated field name
+     */
+    public static function get_field_name_for_itemnumber(string $component, int $itemnumber, string $fieldname): string {
+        $itemname = component_gradeitems::get_itemname_from_itemnumber($component, $itemnumber);
+
+        if ($itemname) {
+            return "{$itemname}{$fieldname}";
+        }
+
+        return $fieldname;
+    }
 }