fixes #3282

Closes #3282

Merge request studip/studip!2217

db/migrations/5.1.51_cleanup_resource_properties.php

+<?php
+/**
+ * @see https://gitlab.studip.de/studip/studip/-/issues/3282
+ */
+final class CleanupResourceProperties extends Migration
+{
+    public function description()
+    {
+        return 'Removes orphaned rows from table "resource_properties" with no '
+             . 'definition in table "resource_property_definitions"';
+    }
+
+    protected function up()
+    {
+        $query = "DELETE FROM `resource_properties`
+                  WHERE `property_id` NOT IN (
+                      SELECT `property_id`
+                      FROM `resource_property_definitions`
+                  )";
+        DBManager::get()->exec($query);
+    }
+}

lib/models/resources/ResourcePropertyDefinition.class.php

@@ -59,6 +59,13 @@ class ResourcePropertyDefinition extends SimpleORMap
             'class_name' => ResourcePropertyGroup::class,
             'foreign_key' => 'property_group_id'
         ];
+
+        $config['has_many']['properties'] = [
+            'class_name'        => ResourceProperty::class,
+            'assoc_foreign_key' => 'property_id',
+            'on_delete'         => 'delete',
+        ];
+
         $config['i18n_fields']['display_name'] = true;
         $config['i18n_fields']['description'] = true;