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

Wed Oct 3 02:46:03 EDT 2007

    [ http://jira.jboss.com/jira/browse/JBSEAM-1596?page=comments#action_12380066 ] 

Diego Ballve commented on JBSEAM-1596:
--------------------------------------

Let aside full blow lock'n'check, an optimistic check would already be a good helper for most of us. The database constraint is still there to catch the cases when that is not enough, right?

I was thinking on how do do it with hibernate validator -like approach but you lack the entity there, so even if you could check if the value is defined in database (entityClass+ property passed as init params to the restriction annotation)  you can't perform a basic check: is it defined for the same object.

One could define an extended hibernate Validator interface that would also take the entity on isValid().. if only ClassValidator would expose its memberValidators, you could detect those from Seam ValidatingResolver and call the new isValid().

On the other hand, the entityClass already gives you what you need to know to build a checking query: (i.e, @Id, @Column(unique=true), etc).It would be a lot of digging for annotations, but still possible to find out what you need.

I have not found a good approach to go with the current interfaces yet, but maybe collecting some possible approaches might shine some light in the discussion.

> 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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