introduce StudygroupInvitation model and use it as relation for course and user and cleanup the orphaned studygroup invitations, fixes #5195

Closes #5195

Merge request studip/studip!3879

1 files changed, 18 insertions, 0 deletions

diff --git a/db/migrations/5.3.28_cleanup_studygroup_invitations.php b/db/migrations/5.3.28_cleanup_studygroup_invitations.php
new file mode 100644
index 0000000..9c67224
--- /dev/null
+++ b/db/migrations/5.3.28_cleanup_studygroup_invitations.php
@@ -0,0 +1,18 @@
+<?php
+return new class extends Migration {
+    public function description()
+    {
+        return 'Removes orphaned entries in table "studygroup_invitations"';
+    }
+
+    protected function up()
+    {
+        $query = "DELETE FROM `studygroup_invitations`
+                  WHERE `user_id` NOT IN (
+                      SELECT `user_id` FROM `auth_user_md5`
+                  ) OR `sem_id` NOT IN (
+                      SELECT `Seminar_id` FROM `seminare`
+                  )";
+        DBManager::get()->exec($query);
+    }
+};