Hi,
Ihave aC++ trouble and I'm wondering if someone can help me here. Iwant
to deal with database using Wt::Dbo. I want to put each table definition
into a separate source file. I have OneToMany relation between two
tables, When I put each class into separate files I got the error:
"'Cities' does not name a type". I got no error If classes are in the
same source file.
I wrote two classes "Country" and "City" with some helper typedefs as
following:
//Country.h ----------------------------------------------
#ifndef COUNTRY_H
#define COUNTRY_H
#include <Wt/Dbo/Dbo>
#include <string>
#include "database.h"
namespace dbo = Wt::Dbo;
// Country
class Country;
typedef dbo::ptr<Country> CountryPtr;
typedef dbo::collection< dbo::ptr<Country> > Countries;
class Country {
public:
Cities cities;
template<class Action>
void persist(Action& a)
{
dbo::hasMany(a, cities, dbo::ManyToOne, "country");
}
};
#endif // COUNTRY_H
// city.h -----------------------------------------------------
#ifndef CITY_H
#define CITY_H
#include <Wt/Dbo/Dbo>
#include <string>
#include "database.h"
namespace dbo = Wt::Dbo;
// City
class City;
typedef dbo::ptr<City> CityPtr;
typedef dbo::collection< dbo::ptr<City> > Cities;
class City {
public:
CountryPtr country;
template<class Action>
void persist(Action& a)
{
dbo::belongsTo(a, country, "country");
}
};
#endif // CITY_H
Thanks a lot
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