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https://issues.apache.org/jira/browse/CAY-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15881047#comment-15881047
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Matt Watson commented on CAY-2242:
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[~ntimofeev] I am now concerned that your solution introduced another bug. I'm
still tracking down specifically what it is, because the test may not show this
scenario, but since it looks like you are about to release M5 I wanted to give
you a quick heads up until I get more details.
> Vertical Inheritance: Cannot Insert Record With Multiple Flattened
> Relationships
> --------------------------------------------------------------------------------
>
> Key: CAY-2242
> URL: https://issues.apache.org/jira/browse/CAY-2242
> Project: Cayenne
> Issue Type: Bug
> Components: Core Library
> Affects Versions: 4.0.M4
> Reporter: Matt Watson
> Assignee: Nikita Timofeev
> Labels: inheritance, multiple, relationship, vertical
> Fix For: 4.0.M5
>
> Attachments: CAY_2242_breaking_test.patch
>
>
> Copied and directly related to issue CAY-2122
> When using the following DbEntities:
> IV_OTHER (id, name)
> IV_BASE (id, type, name)
> IV_IMPL (id, attr1, attr2, other1_id, other2_id) (vertically inherits IV_BASE)
> all fields are non-null
> We end up with ObjEntities:
> IvOther
> IvBase (abstract)
> IvImpl extends IvBase
> When running the following code:
> {code:java}
> IvOther other1 = context.newObject(IvOther.class);
> other1.setName("other1");
> IvOther other2 = context.newObject(IvOther.class);
> other2.setName("other2");
> IvImpl impl = context.newObject(IvImpl.class);
> impl.setName("Impl 1");
> impl.setAttr1("attr1");
> impl.setAttr2("attr2");
> impl.setOther1(other1);
> impl.setOther2(other2);
> context.commitChanges();
> {code}
> Committing this errors in the database, because its trying to insert into the
> IV_IMPL table with a NULL value for OTHER2_ID
> The original issue (and test) was referring to an Entity that only had 1
> flattened relationship. I recently had to add another relationship to this
> Entity, and discovered the same bug pops up again. This time its because the
> new code does not handle merging the flattenedArcKeys if more than one exists
> per ObjectId.
> I will upload the breaking test shortly.
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