[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-682) @ForeignKey override of @MappedSuperclass

[Emmanuel Bernard (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_28913 ] 

Emmanuel Bernard commented on ANN-682:
--------------------------------------

IM chat:

don't know if you want/can do anything about this:
@ForeignKey in a @MappedSuperclass is inherited in subclasses
so these all get the same FK name in the catalog
which doesn't work

so right now i don't see a way to have a @ManyToOne in a @MappedSuperclass and then customize the foreign key constraint

emmanuel 09:32 
I see. Yes open a JIRA issue.
I'm not sure how to solve that cleanly though

christian 09:32 
maybe a hibernate specific @AttributeOverride

emmanuel 09:33 
yes that could do it

> @ForeignKey override of @MappedSuperclass
> -----------------------------------------
>
>                 Key: ANN-682
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-682
>             Project: Hibernate Annotations
>          Issue Type: New Feature
>          Components: binder
>            Reporter: Christian Bauer
>
> Put this @ManyToOne in a @MappedSuperclass:
>     @ManyToOne(fetch = FetchType.LAZY)
>     @JoinColumn(name = "CREATED_BY_USER_ID", nullable = false)
>     // Ideally this foreign key should be ON DELETE SET NULL, however...
>     // Hibernate can't rename these so subclasses would get the same FK constraint name. This doesn't
>     // work, so we need to let Hibernate create a random identifier for these. We could fix this in the
>     // DatabaseObjects.hbm.xml file but we can't even address it because the name is random. This sucks.
>     // So we do a manual SET NULL|DEFAULT when userHome.remove() is called.
>     // @org.hibernate.annotations.ForeignKey(name = "FK_WIKI_NODE_CREATED_BY_USER_ID")
>     protected User createdBy;
> Now all subclasses get that foreign key constraint name in the database catalog, which isn't possible - constraint names have to be unique. 

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