[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1596) Unique Constraint Validator

[Adam Warski (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-1596?page=comments#action_12384569 ] 
            
Adam Warski commented on JBSEAM-1596:
-------------------------------------

But isn't the lack of a unique constraint validator a violation of DRY?

I think it's quite a common constraint, but is quite hard to handle right now. The only reasonable choice is a custom validator ... as verifying it the model can cause problems --- in case of a validation error detected, you have to prevent changes in entity beans to be commited, and the only possible way to do that is rolling back the transaction. As a rollback exception can't be caught, it's not possible to display a user-friendly message on the same page, from thich the form was submitted.

Adam

> Unique Constraint Validator
> ---------------------------
>
>                 Key: JBSEAM-1596
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1596
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: JSF
>    Affects Versions: 2.0.0.BETA1
>            Reporter: Pete Muir
>            Priority: Minor
>
> We could have a generic unique constrain validator as part of the model validation.
>  
> http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4059691#4059691

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