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https://issues.apache.org/jira/browse/CAY-1520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967160#action_12967160
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Andrus Adamchik commented on CAY-1520:
--------------------------------------
Good to know that you found a workaround. Runtime relationships (those
relationships created implicitly by Cayenne to avoid forcing users to create
them), are causing quite a bit of trouble in a number of mapping scenarios. So
here we have another one.
> Deleting Objects with Flattened Read-Only Relationships
> -------------------------------------------------------
>
> Key: CAY-1520
> URL: https://issues.apache.org/jira/browse/CAY-1520
> Project: Cayenne
> Issue Type: Bug
> Affects Versions: 3.0.1
> Environment: multiple
> Reporter: Jan Schaumlöffel
>
> When deleting an object with a flattened read-only relationship an exception
> is thrown:
> Caused by: org.apache.cayenne.CayenneRuntimeException: [v.3.0.1 Sep 06 2010
> 15:09:38] Cannot unset the read-only flattened relationship
> runtimeRelationship0
> at
> org.apache.cayenne.access.DataDomainIndirectDiffBuilder.arcDeleted(DataDomainIndirectDiffBuilder.java:123)
> at
> org.apache.cayenne.access.ObjectDiff$ArcOperation.apply(ObjectDiff.java:440)
> at org.apache.cayenne.graph.CompoundDiff.apply(CompoundDiff.java:91)
> at
> org.apache.cayenne.access.ObjectStoreGraphDiff.apply(ObjectStoreGraphDiff.java:134)
> at
> org.apache.cayenne.access.DataDomainIndirectDiffBuilder.processIndirectChanges(DataDomainIndirectDiffBuilder.java:59)
> at
> org.apache.cayenne.access.DataDomainFlushAction.preprocess(DataDomainFlushAction.java:180)
> at
> org.apache.cayenne.access.DataDomainFlushAction.flush(DataDomainFlushAction.java:134)
> at org.apache.cayenne.access.DataDomain.onSyncFlush(DataDomain.java:824)
> at org.apache.cayenne.access.DataDomain$2.transform(DataDomain.java:791)
> at
> org.apache.cayenne.access.DataDomain.runInTransaction(DataDomain.java:850)
> at org.apache.cayenne.access.DataDomain.onSync(DataDomain.java:788)
> at
> org.apache.cayenne.access.DataContext.flushToParent(DataContext.java:1106)
> at
> org.apache.cayenne.access.DataContext.commitChanges(DataContext.java:1045)
> ...
> It might be the same issue as CAY-784, but I haven't looked at the code yet.
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