From 5e90a93f9da76186650cd05302064e020c2da7f7 Mon Sep 17 00:00:00 2001
From: Sebastian Serth <Sebastian.Serth@hpi.de>
Date: Thu, 22 Sep 2022 10:17:48 +0200
Subject: [PATCH] Add script to migrate duplicated study groups

---
 db/scripts/migrate_study_group.sql | 43 ++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 db/scripts/migrate_study_group.sql

diff --git a/db/scripts/migrate_study_group.sql b/db/scripts/migrate_study_group.sql
new file mode 100644
index 00000000..ada76c8f
--- /dev/null
+++ b/db/scripts/migrate_study_group.sql
@@ -0,0 +1,43 @@
+CREATE OR REPLACE FUNCTION migrate_study_group(target_study_group int, duplicated_study_group int)
+    RETURNS VOID
+    LANGUAGE plpgsql
+AS
+$$
+DECLARE
+
+BEGIN
+    IF target_study_group = duplicated_study_group THEN
+        RETURN;
+    END IF;
+
+    UPDATE community_solution_contributions SET study_group_id = target_study_group WHERE study_group_id = duplicated_study_group;
+    UPDATE remote_evaluation_mappings SET study_group_id = target_study_group WHERE study_group_id = duplicated_study_group;
+    UPDATE authentication_tokens SET study_group_id = target_study_group WHERE study_group_id = duplicated_study_group;
+    UPDATE subscriptions SET study_group_id = target_study_group WHERE study_group_id = duplicated_study_group;
+    UPDATE submissions SET study_group_id = target_study_group WHERE study_group_id = duplicated_study_group;
+
+    -- Preventing duplicated entries in exercises_proxy_exercises
+    -- The same proxy exercise should not have two entries for the same exercise it proxies.
+    DELETE
+    FROM study_group_memberships
+    WHERE study_group_id = duplicated_study_group
+      AND id IN (SELECT duplicated.id
+                                FROM study_group_memberships AS target,
+                                     study_group_memberships AS duplicated
+                                WHERE target.study_group_id = target_study_group
+                                  AND duplicated.study_group_id = duplicated_study_group
+                                  AND target.user_id = duplicated.user_id
+                                  AND target.user_type = duplicated.user_type);
+    UPDATE study_group_memberships SET study_group_id = target_study_group where study_group_id = duplicated_study_group;
+
+    DELETE FROM study_groups WHERE id = duplicated_study_group;
+END;
+$$;
+
+/* Execute migration
+do $$
+begin
+	perform migrate_study_group(target_study_group := 237, duplicated_study_group := 695);
+end
+$$;
+*/