prevent php-error and cleanup unlinked db-entries, closes #3592

Closes #3592

Merge request studip/studip!2485

1 files changed, 23 insertions, 0 deletions

diff --git a/db/migrations/5.5.14_cleanup_cw_tasks.php b/db/migrations/5.5.14_cleanup_cw_tasks.php
new file mode 100644
index 0000000..94ab019
--- /dev/null
+++ b/db/migrations/5.5.14_cleanup_cw_tasks.php
@@ -0,0 +1,23 @@
+<?php
+
+final class CleanupCwTasks extends Migration
+{
+    public function description()
+    {
+        return 'deletes unlinked entries';
+    }
+
+    public function up()
+    {
+        DBManager::get()->exec('
+            DELETE FROM `cw_tasks`
+            WHERE `solver_type` = "user"
+              AND `solver_id` NOT IN (SELECT `user_id` FROM `auth_user_md5`)'
+        );
+        DBManager::get()->exec('
+            DELETE FROM `cw_tasks`
+            WHERE `solver_type` = "group"
+               AND `solver_id` NOT IN (SELECT `statusgruppe_id` FROM `statusgruppen`)'
+        );
+    }
+}