[jira] [Updated] (CAY-2779) "Nullify" delete rules is not processed with n:m and inheritance hierarchy

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

     [ https://issues.apache.org/jira/browse/CAY-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrus Adamchik updated CAY-2779:
---------------------------------
    Fix Version/s: 5.0.M1
                       (was: 4.2)

> "Nullify" delete rules is not processed with n:m and inheritance hierarchy
> --------------------------------------------------------------------------
>
>                 Key: CAY-2779
>                 URL: https://issues.apache.org/jira/browse/CAY-2779
>             Project: Cayenne
>          Issue Type: Bug
>    Affects Versions: 4.2.RC1
>            Reporter: Andrus Adamchik
>            Assignee: Nikita Timofeev
>            Priority: Major
>             Fix For: 5.0.M1
>
>
> A model the same as the one in CAY-2777:
> {noformat}
> // a table with a many to many to self
> T1: id, type
> T11: child_id, parent_id; 
> // Base ObjEntity
> O1: 
>   - flat rel "parents" mapped as "db:parents.parent"
> // Sub ObjEntity 1
> O1S1:
>   - flat rel "children" mapped as "db:children.child"
> // Sub ObjEntity 2
> O1S2:
> {noformat}
> n:m has "Nullify" delete rule on both ends. When deleting a child, the child is not removed from parent's children, because the code gets confused about the inheritance hierarchy. Specifically here inside ObjectContextDeleteAction, "reverseArc" is null, whereas it should be "O1S1.children" :
> {noformat}
> case DeleteRule.NULLIFY:
>     ArcProperty reverseArc = property.getComplimentaryReverseArc();
>     if (reverseArc == null) {
>         // nothing we can do here
>         break;
>     }
> {noformat}
> Oddly enough, it still generated a correct DB operation, deleting the join table record, because of the hardcoded flattened relationship processing block just a few lines prior the one mentioned above. 
> These two things are still incorrect:
> * Parent object still has a child in its collection
> * "nodeRemoved" graph operation is not recorded, so any listener flows that depend on it do not work.



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