[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4320) Bidirectional Polymorphism

[Bruno Medeiros (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39434#action_39434 ] 

Bruno Medeiros commented on HHH-4320:
-------------------------------------

I'm trying to do the same without success.

My code:

@Entity
@Table(name="journals")
public class Journal {
	
	@Id
	private Integer id;
	
	@Any(metaColumn = @Column(name = "journalized_type"))  
	@AnyMetaDef(idType = "integer",
				metaType = "string",
				metaValues = {  
					@MetaValue(value = "Issue", targetEntity = Issue.class),  
					//@MetaValue(value = "Board", targetEntity = Board.class) 
				}
	)  
	@JoinColumn(name="journalized_id")
	private Journalized journalized;
...


@Entity
@Table(name="issues")
public class Issue implements Journalized {
	
	@Id
	private Integer id;
	
	@OneToMany(mappedBy="journalized")
	//@Where(clause="journalized_type = 'Issues'")
	private List<Journal> journals;

...


The error I got is:

Exception in thread "main" org.hibernate.MappingException: Foreign key (FKC131381C3D434C46:journals [journalized_type,journalized_id])) must have same number of columns as the referenced primary key (issues [id])
	at org.hibernate.mapping.ForeignKey.alignColumns(ForeignKey.java:113)
	at org.hibernate.mapping.ForeignKey.alignColumns(ForeignKey.java:96)
	at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1310)
	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1217)
	at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:329)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333)
	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)

Of course there is no way to create foreign keys, We need a @OneToAny annotation. Is there any way to workaround that?

> Bidirectional Polymorphism
> --------------------------
>
>                 Key: HHH-4320
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4320
>             Project: Hibernate Core
>          Issue Type: New Feature
>          Components: annotations
>         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?

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira