[hibernate-issues] [Hibernate-JIRA] Created: (ANN-848) Bidirectional Polymorphism

[Yong Joo Jeong (JIRA)]

Bidirectional Polymorphism
--------------------------

                 Key: ANN-848
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-848
             Project: Hibernate Annotations
          Issue Type: New Feature
          Components: binder
    Affects Versions: 3.4.0.GA
         Environment: 3.4.0.GA, Any database
            Reporter: Yong Joo Jeong


I'm trying to implement bidirectional polymorphic class.


Code:
public class Order{
...
@Any( metaColumn = @Column( name = "item_type" ), fetch=FetchType.EAGER )
@AnyMetaDef( 
    idType = "long", 
    metaType = "string", 
    metaValues = {
        @MetaValue( value = "ItemA", targetEntity = ItemA.class ),
        @MetaValue( value = "ItemB", targetEntity = ItemB.class )
    } )
@JoinColumn( name = "item_id" )
Object item;
...
}

And trying to do somthing like the following


Code:
public class ItemA {
@OneToAny    // like @OneToMany; in Order table there are "item_id" and "item_type" fields to distinguish ItemA and ItemB
List<Order> orders;
...
}

RoR support this kind of relationship, but I can't find it from Hibernate.
Inheritance with "Table per class" is not an option since it does not support the IDENTITY generator strategy. 
Any solution for this?


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