has many fetch progress

include/matador/object/object_ptr.hpp

@@ -3,6 +3,8 @@
 
 #include "matador/utils/identifier.hpp"
 
+#include "matador/object/primary_key_resolver.hpp"
+
 #include <memory>
 
 namespace matador::object {
@@ -10,11 +12,13 @@ template <typename Type>
 class object_ptr {
 public:
   object_ptr() = default;
-  object_ptr(Type *obj) : ptr_(obj) {}
+  explicit object_ptr(Type *obj)
+  : ptr_(obj)
+  , pk_(primary_key_resolver::resolve_object(*obj).pk) {}
   explicit object_ptr(std::shared_ptr<Type> obj) : ptr_(obj) {}
   object_ptr(const object_ptr &other) : ptr_(other.ptr_) {}
   object_ptr(object_ptr &&other) noexcept : ptr_(std::move(other.ptr_)) {}
-  object_ptr &operator=(const object_ptr &other)  = default;
+  object_ptr &operator=(const object_ptr &other) = default;
   object_ptr &operator=(object_ptr &&other) = default;
 
   using value_type = Type;
@@ -22,6 +26,10 @@ public:
   Type& operator*() const { return *ptr_; }
 
   [[nodiscard]] bool empty() const { return ptr_ == nullptr; }
+  void reset(Type *obj) {
+    ptr_.reset(obj);
+    pk_ = primary_key_resolver::resolve_object(*obj).pk;
+  }
 
   Type* get() { return ptr_.get(); }
   const Type* get() const { return ptr_.get(); }

include/matador/object/primary_key_resolver.hpp

@@ -35,6 +35,12 @@ public:
     return primary_key_info_;
   }
 
+  template <typename Type>
+  static primary_key_info resolve_object(const Type& obj) {
+    primary_key_resolver resolver;
+    return resolver.resolve(obj);
+  }
+
   template < class Type >
   void on_primary_key(const char *id, Type &pk, std::enable_if_t<std::is_integral_v<Type> && !std::is_same_v<bool, Type>>* = nullptr) {
     primary_key_info_.pk_column_name = id;