[Hibernate-issues] [Hibernate-JIRA] Closed: (HB-226) Duplicate column error reported for discriminator

[<leg...@at...>]

Message:

   The following issue has been closed.

   Resolver: Gavin King
       Date: Mon, 4 Aug 2003 3:53 AM

In fact, to do this, you are meant to map the "discriminator" property with insert="false" update="false". This was always the case. I'm amazed that you got away with it before....
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View the issue:

  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-226


Here is an overview of the issue:
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        Key: HB-226
    Summary: Duplicate column error reported for discriminator
       Type: Bug

     Status: Closed
   Priority: Critical
 Resolution: REJECTED

    Project: Hibernate2
 Components: 
             core
   Versions:
             2.0.2

   Assignee: 
   Reporter: Tomislav Bodor

    Created: Mon, 4 Aug 2003 12:27 AM
    Updated: Mon, 4 Aug 2003 3:53 AM
Environment: Not specific to operating system or particular environment

Description:
It appears that one of the changes in version 2.0.2 was to add a check for repeated column mappings. Unfortunately, declaring a discriminator column counts as mapping, though it does not make the column available in the mapped entity. If such a mapping is added using the property tag, a "Repeated column in mapping..." error is reported.

Upon checking in the CVS repository, the change was made to EntityPersister class, between versions 1.35 and 1.36, to add ckecks for duplicate column mappings. This was relaxed in 1.37, but not sufficiently. It appears that line 703 (in 2.0.2) should be removed:
   distinctColumns.add(discriminatorColumnName);

This issue makes it impossible to map an inheritance hierarchy to a single table and still have the discriminator available through a getter method in the mapped entity.

Could someone please confirm this and issue a fix or suggest a workaround?


Regards,
Tomislav


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