From 905ee019d7465d89fcd23bea62c95eac542b1c14 Mon Sep 17 00:00:00 2001
From: sascha <skuehl1972@gmail.com>
Date: Thu, 19 Mar 2026 16:46:44 +0100
Subject: [PATCH] startet pk_accessor class

---
 .../matador/utils/primary_key_accessor.hpp    | 105 ++++++++++++++++++
 source/core/CMakeLists.txt                    |   1 +
 2 files changed, 106 insertions(+)
 create mode 100644 include/matador/utils/primary_key_accessor.hpp

diff --git a/include/matador/utils/primary_key_accessor.hpp b/include/matador/utils/primary_key_accessor.hpp
new file mode 100644
index 0000000..67b9a7d
--- /dev/null
+++ b/include/matador/utils/primary_key_accessor.hpp
@@ -0,0 +1,105 @@
+#ifndef MATADOR_PRIMARY_KEY_ACCESSOR_HPP
+#define MATADOR_PRIMARY_KEY_ACCESSOR_HPP
+
+#include "matador/utils/field_attributes.hpp"
+#include "matador/utils/primary_key_attribute.hpp"
+
+#include <cstdint>
+#include <string>
+
+namespace matador::utils {
+class foreign_attributes;
+namespace detail {
+template < typename PrimaryKeyType >
+class primary_key_setter {
+public:
+  explicit primary_key_setter(const std::string &name, const PrimaryKeyType& value)
+  : name_(name)
+  , value_(value){}
+
+  void on_primary_key(const char *id, PrimaryKeyType &pk, const utils::primary_key_attribute & = utils::default_pk_attributes) {
+    if (id != nullptr && name_ == id) {
+      pk = static_cast<PrimaryKeyType>(value_);
+    }
+  }
+  template<typename ValueType>
+  static void on_primary_key(const char * /*id*/, ValueType & /*pk*/, const utils::primary_key_attribute & = utils::default_pk_attributes) {}
+  static void on_revision(const char * /*id*/, uint64_t & /*rev*/) {}
+  template<typename T>
+  static void on_attribute(const char * /*id*/, T &, const utils::field_attributes & = utils::null_attributes) {}
+  template<class P>
+  static void on_belongs_to(const char * /*id*/, P &, const utils::foreign_attributes & ) {}
+  template<class P>
+  static void on_has_one(const char * /*id*/, P &, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many(const char * /*id*/, C &, const char * /*join_column*/, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many_to_many(const char * /*id*/, C &, const char * /*join_column*/, const char * /*inverse_join_column*/, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many_to_many(const char * /*id*/, C &, const utils::foreign_attributes & ) {}
+
+private:
+  const std::string &name_;
+  PrimaryKeyType value_{};
+};
+
+struct pk_unset_checker {
+  const std::string &name;
+  bool unset{true};
+
+  template<class V>
+  void on_primary_key(const char *id, V &pk, const utils::primary_key_attribute & = utils::default_pk_attributes) {
+    if (id != nullptr && name == id) {
+      // Your convention: 0 means unset for integer PKs
+      unset = (static_cast<std::uint64_t>(pk) == 0ULL);
+    }
+  }
+  static void on_revision(const char * /*id*/, uint64_t & /*rev*/) {}
+  template<typename T>
+  static void on_attribute(const char * /*id*/, T &, const utils::field_attributes & = utils::null_attributes) {}
+  template<class P>
+  static void on_belongs_to(const char * /*id*/, P &, const utils::foreign_attributes & ) {}
+  template<class P>
+  static void on_has_one(const char * /*id*/, P &, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many(const char * /*id*/, C &, const char * /*join_column*/, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many_to_many(const char * /*id*/, C &, const char * /*join_column*/, const char * /*inverse_join_column*/, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many_to_many(const char * /*id*/, C &, const utils::foreign_attributes & ) {}
+};
+
+struct pk_value_extractor {
+  std::uint64_t value{0};
+
+  template<class V>
+  void on_primary_key(const char * /*id*/, V &pk, const utils::primary_key_attribute & = utils::default_pk_attributes) {
+    value = static_cast<std::uint64_t>(pk);
+  }
+  static void on_revision(const char * /*id*/, uint64_t & /*rev*/) {}
+  template<typename T>
+  static void on_attribute(const char * /*id*/, T &, const utils::field_attributes & = utils::null_attributes) {}
+  template<class P>
+  static void on_belongs_to(const char * /*id*/, P &, const utils::foreign_attributes & ) {}
+  template<class P>
+  static void on_has_one(const char * /*id*/, P &, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many(const char * /*id*/, C &, const char * /*join_column*/, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many_to_many(const char * /*id*/, C &, const char * /*join_column*/, const char * /*inverse_join_column*/, const utils::foreign_attributes & ) {}
+  template<class C>
+  static void on_has_many_to_many(const char * /*id*/, C &, const utils::foreign_attributes & ) {}
+};
+
+}
+
+template<typename PrimaryKeyType>
+class primary_key_accessor {
+public:
+
+  PrimaryKeyType get() const;
+  PrimaryKeyType
+};
+}
+
+#endif //MATADOR_PRIMARY_KEY_ACCESSOR_HPP
\ No newline at end of file
diff --git a/source/core/CMakeLists.txt b/source/core/CMakeLists.txt
index ff8d19f..763cbf9 100644
--- a/source/core/CMakeLists.txt
+++ b/source/core/CMakeLists.txt
@@ -124,6 +124,7 @@ add_library(matador-core STATIC
   object/collection_utils.cpp
   ../../include/matador/object/pk_field_locator.hpp
   ../../include/matador/object/object_cache.hpp
+  ../../include/matador/utils/primary_key_accessor.hpp
 )
 
 target_link_libraries(matador-core ${CMAKE_DL_LIBS})