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https://issues.apache.org/cayenne/browse/CAY-991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756#action_12756
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Ari Maniatis commented on CAY-991:
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I agree with this. In fact I'd go further and suggest that validation SHOULD
happen on the client since this would avoid a round trip to the server for no
reason. In our application we currently manually add these validation elements
to the client (outside of Cayenne) so that we can perform
validation-as-you-type in a Swing GUI. In the long term of course we'd like to
share our validation code between client and server, but this task would take
us a small step in the right direction.
> isMandatory() and getMaxLength() should be members of ObjAttributeб not only
> ClientObjAttribute
> -----------------------------------------------------------------------------------------------
>
> Key: CAY-991
> URL: https://issues.apache.org/cayenne/browse/CAY-991
> Project: Cayenne
> Issue Type: Improvement
> Components: Cayenne Core Library
> Affects Versions: 3.0
> Reporter: Andrey Razumovsky
> Assignee: Andrus Adamchik
> Priority: Minor
>
> While working on client side (using ROP) or server side, developer my access
> isMandatory and getMaxLength properties of an ObjAttribute. On server this is
> usually done by getDbAttribute().isMandatory() and
> getDbAttribute().getMaxLength(). Since DbEntities are not being sent to
> client, these two properties are manully set in ClientObjAttribute. So it
> makes sense to make isMandatory() and getMaxLength() members of ObjAttribute
> with reference to the same props of DbAttribute for server class, and
> reference to own ClientObjAttribute class fields for clint implementation.
> This is important for validation, because current validateForSave() method of
> CayenneDataObject cannot be anyhow applied to client objects. I don't think
> client objects should by default implement Validating, because validation
> code would execute twice this way (on client and on server). But still it
> would be nice to see validation method somewhere (maybe in DataObjectUtils)
> so that i could check my objects BEFORE commit
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