Incorporate the permanent user deletion sprinkle

src/Database/ModelTraits/UserPermanentlyDeletable.php

@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * AVSDev UF Tweaks (https://avsdev.uk)
+ *
+ * @link      https://git.avsdev.uk/avsdev/sprinkle-uf-tweaks
+ * @license   https://git.avsdev.uk/avsdev/sprinkle-uf-tweaks/blob/master/LICENSE.md (LGPL-3.0 License)
+ */
+
+namespace UserFrosting\Sprinkle\UFTweaks\Database\ModelTraits;
+
+trait UserPermanentlyDeletable {
+    protected function preventActivityPurge() {
+        /** @var \UserFrosting\Sprinkle\Core\Util\ClassMapper $classMapper */
+        $classMapper = static::$ci->classMapper;
+
+        /** @var \UserFrosting\Support\Repository\Repository $config */
+        $config = static::$ci->config;
+
+        if ($this->isForceDeleting() && !$config['users.purge_activities']) {
+            // Keep the activity log, but lose the user field
+            $classMapper->getClassMapping('activity')::query()
+                ->where('user_id', $this->id)
+                ->update(['user_id' => null]);
+
+            $this->refresh();
+        }
+
+        return true;
+    }
+
+    public function bootUserPermanentlyDeletable()
+    {
+        static::deleting(function ($user) {
+            if (!$user->preventActivityPurge()) {
+                return false;
+            }
+
+            return true;
+        });
+    }
+}