From 7fa9d327ef55a955de444f315e99801da6e3e234 Mon Sep 17 00:00:00 2001
From: iszmais <iszmais@databay.de>
Date: Fri, 9 Oct 2026 13:00:48 +0200
Subject: [PATCH] migrate dc multiselect value to string arrays

---
 ...lDataCollectionSelectionFieldMigration.php | 92 +++++++++++++++++++
 .../class.ilDataCollectionSetupAgent.php      |  3 +-
 2 files changed, 94 insertions(+), 1 deletion(-)
 create mode 100644 components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSelectionFieldMigration.php

diff --git a/components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSelectionFieldMigration.php b/components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSelectionFieldMigration.php
new file mode 100644
index 000000000000..5cb1957f42aa
--- /dev/null
+++ b/components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSelectionFieldMigration.php
@@ -0,0 +1,92 @@
+<?php
+
+/**
+ * This file is part of ILIAS, a powerful learning management system
+ * published by ILIAS open source e-Learning e.V.
+ *
+ * ILIAS is licensed with the GPL-3.0,
+ * see https://www.gnu.org/licenses/gpl-3.0.en.html
+ * You should have received a copy of said license along with the
+ * source code, too.
+ *
+ * If this is not the case or you just want to try ILIAS, you'll find
+ * us at:
+ * https://www.ilias.de
+ * https://github.com/ILIAS-eLearning
+ *
+ *********************************************************************/
+
+declare(strict_types=1);
+
+use ILIAS\Setup\Environment;
+
+class ilDataCollectionSelectionFieldMigration implements \ILIAS\Setup\Migration
+{
+    public const DEFAULT_AMOUNT_OF_STEPS = 10000;
+
+    protected ilDBInterface $db;
+
+    public function getLabel(): string
+    {
+        return "Migration of DataCollection selection field values";
+    }
+
+    public function getDefaultAmountOfStepsPerRun(): int
+    {
+        return self::DEFAULT_AMOUNT_OF_STEPS;
+    }
+
+    public function getPreconditions(Environment $environment): array
+    {
+        return [
+            new ilDatabaseInitializedObjective(),
+            new ilDatabaseUpdatedObjective(),
+        ];
+    }
+
+    public function prepare(Environment $environment): void
+    {
+        $this->db = $environment->getResource(Environment::RESOURCE_DATABASE);
+    }
+
+    public function step(Environment $environment): void
+    {
+        $stmt = $this->db->queryF(
+            'SELECT il_dcl_stloc1_value.* FROM il_dcl_stloc1_value ' .
+            'INNER JOIN il_dcl_record_field on il_dcl_record_field.id = il_dcl_stloc1_value.record_field_id ' .
+            'INNER JOIN il_dcl_field ON il_dcl_field.id = il_dcl_record_field.field_id ' .
+            'WHERE (datatype_id = %s OR datatype_id = %s) AND value LIKE %s AND value NOT LIKE %s AND value != "[]"',
+            [ilDBConstants::T_INTEGER, ilDBConstants::T_INTEGER, ilDBConstants::T_TEXT, ilDBConstants::T_TEXT],
+            [ilDclDatatype::INPUTFORMAT_TEXT_SELECTION, ilDclDatatype::INPUTFORMAT_DATE_SELECTION, '[%', '["%']
+        );
+
+        while ($row = $this->db->fetchAssoc($stmt)) {
+            $old_values = json_decode($row['value']);
+            $new_values = [];
+            foreach ($old_values as $old_value) {
+                $new_values[] = (string) $old_value;
+            }
+            $this->db->update(
+                'il_dcl_stloc1_value',
+                ['value' => [ilDBConstants::T_TEXT, json_encode($new_values)]],
+                ['id' => [ilDBConstants::T_INTEGER, $row['id']]]
+            );
+        }
+    }
+
+    public function getRemainingAmountOfSteps(): int
+    {
+        $legacy_file_field_amount = $this->db->fetchObject(
+            $this->db->queryF(
+                'SELECT COUNT(il_dcl_stloc1_value.id) AS amount FROM il_dcl_stloc1_value ' .
+                'INNER JOIN il_dcl_record_field on il_dcl_record_field.id = il_dcl_stloc1_value.record_field_id ' .
+                'INNER JOIN il_dcl_field ON il_dcl_field.id = il_dcl_record_field.field_id ' .
+                'WHERE (datatype_id = %s OR datatype_id = %s) AND value LIKE %s AND value NOT LIKE %s AND value != "[]"',
+                [ilDBConstants::T_INTEGER, ilDBConstants::T_INTEGER, ilDBConstants::T_TEXT, ilDBConstants::T_TEXT],
+                [ilDclDatatype::INPUTFORMAT_TEXT_SELECTION, ilDclDatatype::INPUTFORMAT_DATE_SELECTION, '[%', '["%']
+            )
+        );
+
+        return (int) $legacy_file_field_amount?->amount;
+    }
+}
diff --git a/components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSetupAgent.php b/components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSetupAgent.php
index b8250930c405..27b05cf98344 100755
--- a/components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSetupAgent.php
+++ b/components/ILIAS/DataCollection/classes/Setup/class.ilDataCollectionSetupAgent.php
@@ -42,7 +42,8 @@ public function getMigrations(): array
     {
         return [
             new ilDataCollectionStorageMigration(),
-            new ilDataCollectionInitLOMMigration()
+            new ilDataCollectionInitLOMMigration(),
+            new ilDataCollectionSelectionFieldMigration()
         ];
     }