relation completer progress

include/matador/object/relation_endpoint.hpp

@@ -3,6 +3,7 @@
 
 #include "matador/utils/enum_mapper.hpp"
 
+#include <cstdint>
 #include <memory>
 
 namespace matador::object {
@@ -27,6 +28,7 @@ public:
 
   [[nodiscard]] std::string field_name() const;
   [[nodiscard]] relation_type type() const;
+  [[nodiscard]] std::string type_name() const;
   [[nodiscard]] const schema_node& node() const;
 
   [[nodiscard]] bool is_has_one() const;
@@ -37,6 +39,9 @@ public:
   void link_foreign_endpoint(const std::shared_ptr<relation_endpoint>& endpoint);
 
 private:
+  template<typename>
+  friend class relation_completer;
+
   std::string field_name_;
   relation_type type_;
   std::shared_ptr<schema_node> node_;