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https://issues.apache.org/jira/browse/CAY-2565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16900958#comment-16900958
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Arseni Bulatski commented on CAY-2565:
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For *4.1* added exception when trying to use PK property with obj path
properties.
https://github.com/apache/cayenne/commit/dc0b6507bb9a29d7f5d0939d1806b404f28d1929
> Can't use new generated PK properties with dot() operator
> ---------------------------------------------------------
>
> Key: CAY-2565
> URL: https://issues.apache.org/jira/browse/CAY-2565
> Project: Cayenne
> Issue Type: Bug
> Components: Core Library
> Affects Versions: 4.1.B1
> Reporter: Nikita Timofeev
> Assignee: Nikita Timofeev
> Priority: Major
> Fix For: 4.1.B3, 4.2.M1
>
>
> Per CAY-2478 we can generate properties for PK attributes. But they are
> incompatible with {{dot() }} operator as it is unaware about db paths.
> Simple test case: {code}
> Expression exp = Painting.TO_ARTIST.dot(Artist.ARTIST_ID_PK_PROPERTY).eq(1L);
> {code}
> Will generated following expression: {{toArtist.null = 1}}
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