From b8df32bdf958eb33a90a232ad7260d120823abed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sascha=20K=C3=BChl?= <s.kuehl@tms-bonn.de>
Date: Fri, 7 Feb 2025 11:44:06 +0100
Subject: [PATCH] implemented reference method

---
 source/core/object/schema.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/source/core/object/schema.cpp b/source/core/object/schema.cpp
index 214fe8b..12a6ef6 100644
--- a/source/core/object/schema.cpp
+++ b/source/core/object/schema.cpp
@@ -36,7 +36,15 @@ std::string schema::name() const {
 }
 
 utils::result<std::pair<std::string, std::string>, utils::error> schema::reference( const std::type_index& type_index ) const {
-    return utils::ok(std::pair<std::string, std::string>{});
+    const auto result = find_node(type_index);
+    if (!result) {
+        return utils::failure(result.err());
+    }
+    if (!result->get()->basic_info().definition().has_primary_key()) {
+        return utils::failure(make_error( error_code::Failure, "Primary key not found" ));
+    }
+
+    return utils::ok(std::make_pair(result->get()->name(), result->get()->basic_info().definition().primary_key()->name()));
 }
 
 utils::result<std::shared_ptr<schema_node>, utils::error> schema::attach_node(const std::shared_ptr<schema_node> &node,