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https://issues.apache.org/jira/browse/CAY-2604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16902048#comment-16902048
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Nikita Timofeev commented on CAY-2604:
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I've experimented with this and came up with notation for compound PK case:
{{"@id:ARTIST_ID"}}
> Specialization of property API for PK
> -------------------------------------
>
> Key: CAY-2604
> URL: https://issues.apache.org/jira/browse/CAY-2604
> Project: Cayenne
> Issue Type: Improvement
> Components: cgen
> Reporter: Nikita Timofeev
> Assignee: Nikita Timofeev
> Priority: Major
> Fix For: 4.2.M1
>
>
> Properties generated for PK in 4.1 has issues (see CAY-2565), so we need some
> logic to deal with them.
> Instead of using DbPath directly we can make special type of {{Property}}
> (probably {{IdProperty}}) to make them usable in all cases.
> Required cases to handle:
> - compatibility with {{dot()}} operator
> - in-memory sorting
> - in-memory evaluation
> My approach is to use special name {{"@id"}} as path for PK. Limitation - it
> will be unusable with compound PKs.
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