1 files changed, 31 insertions, 0 deletions
diff --git a/models/db/consistency.go b/models/db/consistency.go
new file mode 100644
index 0000000..d19732c
--- /dev/null
+++ b/models/db/consistency.go
@@ -0,0 +1,31 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package db
+
+import (
+	"context"
+
+	"xorm.io/builder"
+)
+
+// CountOrphanedObjects count subjects with have no existing refobject anymore
+func CountOrphanedObjects(ctx context.Context, subject, refobject, joinCond string) (int64, error) {
+	return GetEngine(ctx).
+		Table("`"+subject+"`").
+		Join("LEFT", "`"+refobject+"`", joinCond).
+		Where(builder.IsNull{"`" + refobject + "`.id"}).
+		Select("COUNT(`" + subject + "`.`id`)").
+		Count()
+}
+
+// DeleteOrphanedObjects delete subjects with have no existing refobject anymore
+func DeleteOrphanedObjects(ctx context.Context, subject, refobject, joinCond string) error {
+	subQuery := builder.Select("`"+subject+"`.id").
+		From("`"+subject+"`").
+		Join("LEFT", "`"+refobject+"`", joinCond).
+		Where(builder.IsNull{"`" + refobject + "`.id"})
+	b := builder.Delete(builder.In("id", subQuery)).From("`" + subject + "`")
+	_, err := GetEngine(ctx).Exec(b)
+	return err
+}