Re: Can't add an element. Why?

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On May 21, 2004, at 2:27 PM, Mike Elliott wrote:
> <db-entity name="join_artist_exhibit">
> <db-attribute name="artist_pk" type="INTEGER" isMandatory="true"/>
> <db-attribute name="exhibit_pk" type="INTEGER" isMandatory="true"/>
> <db-attribute name="pk" type="INTEGER" isPrimaryKey="true"
> isMandatory="true"/>
> </db-entity>

> Are all flattened relationships read-only?

No, not all. However currently Cayenne checks that all attributes of
the join table are a part of the primary key. In your case it really
doesn't matter, and I think this check is dumb. For now to fix it, mark
artist_pk and exhibit_pk columns as PK in the modeler. I opened a bug
report (http://objectstyle.org/jira/secure/ViewIssue.jspa?key=CAY-130),
so this should be fixed in Cayenne soon.

> If the relationship is read-only, why is a method generated solely
> for the modification of it which, whenever it is run, merely throws an
> exception saying
> it can't do anything?

There is an old task that is supposed to address this issue:
http://objectstyle.org/jira/secure/ViewIssue.jspa?key=CAY-38 . So it
won't be like that in the future.

Andrus

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