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

[Eugene Voytitsky (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30135 ] 

Eugene Voytitsky commented on ANN-682:
--------------------------------------

Did I understand right that currently Hibernate doesn't have possibility to rename name of auto-generated foreign key constraint for association which is defined in my @MappedSuperclass?

In other words, if I have @ManyToOne association in my @MappedSuperclass class and number of entity subclasses then I have no way to explicitly specify (rename) the names of foreign keys in each entity subclass: neither @AttributeOverride nor @AssociationOverride provides the possibility to specify foreign key name.

It's a pity.

Actually I only have very ugly solution/workaround:
because I use @AccessType("filed") strategy for my @MappedSuperclass class I can change the strategy to @AccessType("property") on all entity subclasses and fully redefine the association on getter method, something like this:

@AccessType("property")
public class Entity1 extends MyBaseClass {

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "user_id", nullable = false)
    @ForeignKey(name = "fk_entity1_2_user")
    public User getUser() {
        return super.getUser();
    }

Everything smells bad in this "solution":
* changing the strategy
* full redifinition of the association
* and even invocation of super.getUser()

Is it going to be improved in the upcoming Hibernate releases?
Thanks in advance.

> @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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