Wt

Hey Michael,

There were two problems.

The first was a problem in Wt::Dbo when loading an object using a natural id. Oops! This slipped through our automated tests of Wt::Dbo, and so we have also added more tests.

This has been fixed now in git.

The patch itself is rather small, so I have also included it here in case you would rather not switch to the git version of Wt.

The second is a few misconceptions related to the usage of composite keys.

This is a proper class definition for a composite key class:

namespace Domain
{
  class CompositeKey
  {
  public:
    int id_;
    short idMandator_;

    CompositeKey();
    CompositeKey(int id, short idMandator);
    CompositeKey (const CompositeKey &src);
    virtual ~CompositeKey();
    bool operator== (const CompositeKey& other) const;
    bool operator< (const CompositeKey& other) const;
  };

  extern std::ostream& operator<< (std::ostream&, const CompositeKey& key);
}

namespace Wt {
  namespace Dbo {

    template <class Action>
      void field(Action& action, Domain::CompositeKey& compositeKey, const std::string& name, int size = -1)
      {
        field(action, compositeKey.id_, name);
        field(action, compositeKey.idMandator_, name + "Mandator");
      }
  }
}

So the field() declaration simply needs to be in global scope, not inside your class. Otherwise your code looked good !

Regards

koen

Hi Koen,

Thanks a lot for your prompt reply! Applying your changes it looks much better now, there is only a linker error left related to the streaming operator.

Would have any idea on this one?

Building target: I3GIS.wt

Invoking: GCC C Linker

g -L/usr/local/lib -o"I3GIS.wt" ./src/ui/MapDescriptionDialog.o ./src/ui/MapDialog.o ./src/ui/RemoveLayerDialog.o ./src/ui/RenameLayerDialog.o ./src/persistence/DaoFactory.o ./src/persistence/FeatureLayerDao.o ./src/persistence/FeaturePresentationDao.o ./src/persistence/MapDao.o ./src/persistence/RasterLayerDao.o ./src/persistence/RasterPresentationDao.o ./src/exceptions/Exception.o ./src/domain/CompositeKey.o ./src/domain/FeatureLayer.o ./src/domain/FeaturePresentation.o ./src/domain/Layer.o ./src/domain/Map.o ./src/domain/Presentation.o ./src/domain/RasterLayer.o ./src/domain/RasterPresentation.o ./src/I3GIS.o ./src/I3GISApp.o -lwthttp -lwtdbopostgres -lboost_signals -lwtext -lwt

./src/domain/RasterPresentation.o: In function `boost::detail::lexical_stream<std::basic_string<char, std::char_traits, std::allocator >, Domain::CompositeKey, std::char_traits >::operator<<(Domain::CompositeKey const&)':

RasterPresentation.cpp:(.text.ZN5boost6detail14lexical_streamISsN6Domain12CompositeKeyESt11char_traitsIcEElsERKS3[boost::detail::lexical_stream<std::basic_string<char, std::char_traits, std::allocator >, Domain::CompositeKey, std::char_traits >::operator<<(Domain::CompositeKey const&)]+0x1d): undefined reference to `Domain::operator<<(std::basic_ostream<char, std::char_traits >&, Domain::CompositeKey const&)'

collect2: ld returned 1 exit status

make: * [I3GIS.wt] Error 1

Hi Koen,

Problem fixed. I had forgotten the actual definition of the operator<<, so far there was only its declaration.

Many thanks,

Michael