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From "Nikita Timofeev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CAY-2282) Various Update Issues With Vertical Inheritance
Date Thu, 04 May 2017 11:36:04 GMT

    [ https://issues.apache.org/jira/browse/CAY-2282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996593#comment-15996593
] 

Nikita Timofeev commented on CAY-2282:
--------------------------------------

Hi Matt,

I've done some experiments regarding flattened relationships update and found that the problem
is really deep and requires to change some basic concepts of flattened attributes and relationships
as Cayenne can't deal with update of those. So this problem really not in inheritance itself
but in the underlying "flattened" mechanics.
I'll create new task for the required changes and it appears that it will be postponed till
4.1 where we can break things a little bit and hopefully resolve this one as well as CAY-2146.

So for now I'll only apply your patch for the second part of this issue and your tests for
the first (though disabled for now).

> Various Update Issues With Vertical Inheritance
> -----------------------------------------------
>
>                 Key: CAY-2282
>                 URL: https://issues.apache.org/jira/browse/CAY-2282
>             Project: Cayenne
>          Issue Type: Bug
>          Components: Core Library
>    Affects Versions: 4.0.M5
>            Reporter: Matt Watson
>            Assignee: Nikita Timofeev
>              Labels: inheritance, lock, optimistic, relationship, update, vertical
>         Attachments: breaking_test.patch, fixes-2-testUpdateWithOptimisticLocks.patch
>
>
> The two tests in the attached "breaking-test" patch show the two scenarios that are broken.
> 1) {{testUpdateTwoObjectsWithMultipleAttributeAndMultipleRelationship}} : breaks because
of the relationship change. Without changing relationship the update actually works fine.
But with the relationship change its going through {{DataDomainIndirectDiffBuilder.arcDeleted}}
and {{DataDomainIndirectDiffBuilder.arcCreated}} thus creating flattened Insert and Delete
statements instead of an UPDATE statement.
> 2) {{testUpdateWithOptimisticLocks}} : breaks because the vertically inherited ObjEntity
has an attribute using Optimistic Lock for a field that is actually on the parent DbEntitity,
and the Update query that is built is incorrectly referencing the column on the wrong table
for the {{qualifierExpression}}.
> I actually already have a fix ready for this 2nd issue, but want to get both of these
issues fixed in this ticket, so anyone helping on this issue please focus on fixing the first
test.



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