Hello all,

I've got a simple (I think) problem. But I'm stuck with it.

I have two classes (very simplified):



Partner is mapped as joined-subclass of User. Table per concrete class. Tables tb_users and tb_partners are joined by primary keys (user id).

Now i want to promote existent User to Partner. Please, any tips.

UPD: tips like "you are using OOP in a wrong way" are also accepted !!!

Instead of Partner extending User, I'd put the User object inside the Partner and store each in their own unrelated tables. Creating a Partner from an existing user then becomes trivial.

Use a one-to-one mapping Partner->User and, optionally, from User->Partner. Having it bi-directional allows you to query for Users matching some criteria on Partner. You don't need to expose the Partner property from User if you don't want to - hibernate can access private get/set methods.

If you need to mix User and Partner objects for some operations then extract an interface from User and make User and Partner implement. To implement the new interface in Partner, delegate the methods to the contained User object.

Mike

thanks Mike! solved!