[hibernate-issues] [Hibernate-JIRA] Resolved: (HCANN-32) Discriminator for Single table per class hierarchy (2.2.4.2) should be optional

[Emmanuel Bernard (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HCANN-32?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Emmanuel Bernard resolved HCANN-32.
-----------------------------------

    Resolution: Won't Fix

That's a quite broken model that fails for read/write approaches.
It's mappable with hibernate via hbm files but I'm reluctant to make more complex the discriminator logic for that.

> Discriminator for Single table per class hierarchy (2.2.4.2)  should be optional
> --------------------------------------------------------------------------------
>
>                 Key: HCANN-32
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HCANN-32
>             Project: Hibernate Commons Annotations
>          Issue Type: Improvement
>    Affects Versions: 3.2.0
>            Reporter: Tobias Marx
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> If a Single table per class inheritance is used for cases as shown in the documentation, this makes perfect sense to need a Discriminator column.
> However, in many scenarios, no Discriminator is needed as there will only different represenations of the same object.
> Example:
> One library defines a User entity.
> In order to separate different Security implementations from each other, another library can extend this User Object, e.g.
> as an ExtendedUser.
> Some classes will query the table with less columns and call it "User" - some will query the same table in parallel as "ExtendendUser" - so no discriminator is needed - and adding an additional column makes now sense.
> The colunns needed are already defined in the entities themselves.

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