[odb-users] unable to map C++ type '::__gnu_cxx::new_allocator< ::std::weak_ptr< ... error in One-to-Many relationships

[Monika Idzik]

Dear ODB-Users,
I encountered a problem trying to make a one-to-many relationship in odb, I
get the following error:

src/experiment_configuration/experiment_configuration.hpp:218:43: error:
unable to map C++ type '::__gnu_cxx::new_allocator< ::std::weak_ptr<
::performance_test::AnalysisResult > >::value_type' used in data member
'results' to a SQLite database type
src/experiment_configuration/experiment_configuration.hpp:218:43: info: use
'#pragma db value_type' to specify the database type

I have one class called ExeprimentConfiguration and one class
AnalysisResult. I want to have one (ExeprimentConfiguration) to many
(AnalysisResult) relationship between them. These 2 classes are in two
separate files:
src/experiment_configuration/experiment_configuration.hpp
and
src/experiment_execution/analysis_result.hpp
Here basic code from the files:

//experiment_configuration.hpp

#include <odb/core.hxx>

class AnalysisResult;

#pragma db object
class ExperimentConfiguration
{
public:
  ...

private:
  ...
  friend class odb::access;

  #pragma db id
  boost::uuids::uuid m_id;

  #pragma db value_not_null inverse(configuration)
  std::vector<std::weak_ptr<AnalysisResult>> results;

};

//analysis_result.hpp

#include <odb/core.hxx>
#include "../experiment_configuration/experiment_configuration.hpp"

#pragma db object
class AnalysisResult
{
public:
  ...
private:
  ...
  friend class odb::access;
  ...
  #pragma db id
  unsigned long id_;

  #pragma db not_null
  std::shared_ptr<ExperimentConfiguration> configuration;
};

I followed here section 6.2.2. One-to-Many Relationships in the odb manual.

I use ODB object-relational mapping (ORM) compiler for C++ 2.5.0-b.16 and
gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0

Could you help me figuring out what I'm doing wrong?

Thank you,
Monika