Hi,
I was wondering if there are any plans for being able to map class
hierarchies - or indeed if anyone has already done such a thing with
Wt::Dbo?
I can see that it is possible to have a pattern like
class Base {
int bi;
template<class Action>
void persist(Action& a) {
dbo::field(a, bi, "bi"); }
}
class D1 : public Base {
int da;
template<class Action>
void persist(Action& a) {
base::persist(a);
dbo::field(a, da, "da"); }
}
class D2 : public Base {
int db;
template<class Action>
void persist(Action& a) {
base::persist(a);
dbo::field(a, db, "db"); }
}
and then
session.mapClass<D1>("D1");
session.mapClass<D2>("D2");
so that there is one (unrelated) table for each subclass (OK if the
base class is abstract). However, it would be nice to be able to map
these classes to 3 related tables where there is a 1-to-1 relation
between the derived class tables and the base class - I don't think
that this is achievable with the current facilities, particularly
without introducing extra members to store the relationships - I think
that it would be desirable if the foreign key relations in the derived
classes were automatically managed.
Regards,
Paul.
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