session progress

test/models/department.hpp

@@ -14,6 +14,7 @@ struct department {
     unsigned int id{};
     std::string name;
     std::vector<object::object_ptr<employee>> employees;
+    object::object_ptr<employee> manager;
 
     template<typename Operator>
     void process(Operator &op) {
@@ -21,6 +22,7 @@ struct department {
         field::primary_key(op, "id", id);
         field::attribute(op, "name", name, 63);
         field::has_many(op, "employees", employees, "dep_id", utils::fetch_type::EAGER);
+        field::belongs_to(op, "manager_id", manager, utils::fetch_type::EAGER);
     }
 };