[jira] [Commented] (CAY-1947) Extraneous UPDATE on phantom toOne

["Andrus Adamchik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CAY-1947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14115303#comment-14115303 ] 

Andrus Adamchik commented on CAY-1947:
--------------------------------------

additionally noticed :

ObjectDiff.currentArcSnapshot is unused in 3.2. Need to kill it, it just takes memory and time to maintain.

> Extraneous UPDATE on phantom toOne
> ----------------------------------
>
>                 Key: CAY-1947
>                 URL: https://issues.apache.org/jira/browse/CAY-1947
>             Project: Cayenne
>          Issue Type: Bug
>    Affects Versions: 3.2M1
>            Reporter: Andrus Adamchik
>            Assignee: Andrus Adamchik
>            Priority: Minor
>
> in a 1..N relationship, where there's no corresponding N..1 on the object side, a phantom update (same to-one set twice) causes an UPDATE query that is essentially a noop. See https://github.com/nhl/link-rest/issues/28. This comes down to the fact that we do not analyze "phantomFks" inside ObjectDiff.isNoop(..). (Or maybe when we resolve to-many and find phantom objects are already in it, we should unregister a change from ObjectStore?)



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