[jira] [Comment Edited] (CAY-1902) Implement resolving Db paths for DataObjects

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

    [ https://issues.apache.org/jira/browse/CAY-1902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910572#comment-13910572 ] 

Andrus Adamchik edited comment on CAY-1902 at 2/24/14 5:51 PM:
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[~johnthuss] Yeah, I guess if we have a multi-step path, fetch is unavoidable. But wonder if we can avoid a cast to DataContext and a call to objectStore.getCachedSnapshot(oid) (this can return null - the underlying cache is an LRU after all, and can overflow and lose some snapshots).

For multi-step paths, I would probably just reverse the entire path (by going through each component and doing DbRelationship.createReverseRelationship(..)) and build a single query.


was (Author: andrus):
[~johnthuss] Yeah, I guess if we have a multi-step path, fetch is unavoidable. But wonder if we can avoid a cast to DataContext, a call to objectStore.getCachedSnapshot(oid) (this can return null - the underlying cache is an LRU after all, and can overflow and lose some snapshots).

For multi-step paths, I would probably just reverse the entire path (by going through each component and doing DbRelationship.createReverseRelationship(..)) and build a single query.

> Implement resolving Db paths for DataObjects
> --------------------------------------------
>
>                 Key: CAY-1902
>                 URL: https://issues.apache.org/jira/browse/CAY-1902
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Core Library
>    Affects Versions: 3.2.M2
>            Reporter: John Huss
>            Assignee: John Huss
>            Priority: Minor
>             Fix For: 3.2.M2
>
>         Attachments: 0001-Implement-db-path-evaluation-in-memory.patch
>
>
> Expressions using db paths don't support in-memory evaluation against DataObjects (there is a TODO in the code).



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