diff --git a/include/matador/orm/session.hpp b/include/matador/orm/session.hpp
index 03e376b..16eab0e 100644
--- a/include/matador/orm/session.hpp
+++ b/include/matador/orm/session.hpp
@@ -37,6 +37,40 @@ public:
     }
 
 };
+
+class prototype_builder final {
+public:
+  explicit prototype_builder(const std::unordered_map<std::string, sql::statement> &statements_per_column)
+  : statements_per_column_(statements_per_column) {}
+
+  template < class V >
+  static void on_primary_key(const char * /*id*/, V &/*pk*/, const utils::primary_key_attribute& /*attr*/ = utils::default_pk_attributes) {}
+  static void on_revision(const char * /*id*/, unsigned long long &/*rev*/) {}
+  template<typename Type>
+  static void on_attribute(const char * /*id*/, Type &/*obj*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
+  template<class Pointer>
+  void on_belongs_to(const char *id, Pointer &obj, const utils::foreign_attributes &attr) {
+
+  }
+  template<class Pointer>
+  void on_has_one(const char *id, Pointer &obj, const utils::foreign_attributes &attr) {
+
+  }
+  template<class ContainerType>
+  void on_has_many(const char * /*id*/, ContainerType &, const char *join_column, const utils::foreign_attributes &attr) {
+  }
+  template<class ContainerType>
+  void on_has_many_to_many(const char *id, ContainerType &/*cont*/, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &attr) {
+
+  }
+  template<class ContainerType>
+  void on_has_many_to_many(const char *id, ContainerType &/*cont*/, const utils::foreign_attributes &attr) {
+
+  }
+
+private:
+  const std::unordered_map<std::string, sql::statement> &statements_per_column_;
+};
 class session final : public sql::executor {
 public:
   explicit session(session_context &&ctx);