Polymorphism-aware entity view validation

[Mobe91]

In the following entity view scenario, the view validation fails because AbstractOffer does have a mapped property 'foo'.

@EntityView(AbstractOffer.class)
public interface ProductVariantOfferView {
   public Boolean getFoo();
}

@Entity
public class AbstractOffer { }

@Entity
public class WebShopOffer extends AbstractOffer { }

@Entity
public class PhysicalShopOffer extends AbstractOffer {
   private boolean foo;

   public Boolean getFoo() {
        return foo;
    }

    public void setFoo(Boolean foo) {
        this.foo = foo;
    }
}

[beikov]

I think the only good way to support this kind of mapping would be to implement it with the TREAT operator(#120). You would have a mapping like @Mapping("TREAT(this AS PhysicalShopOffer).foo") which would also require the introduction of an implicit this alias.

[beikov]

Superseded by #312