Jugen opened a new pull request, #614:
URL: https://github.com/apache/cayenne/pull/614
When deleting an ObjEntity with flattened attributes Cayenne deletes the
related DB attribute's row as well.
So if we have for example an ObjEntity "FlatPainting" with flattened
attribute "galleryName". If we then delete a "FlatPainting" then the associated
gallery will also be deleted, leaving all other paintings at that gallery
without a valid Gallery link.
Furthermore if we add to our "FlatPainting" a "gallery" relationship
attribute with delete rule Deny, the gallery was still being deleted.
The original intention was for something like a "PaintingFull" ObjEntity
having all painting attributes and a flattened attribute to "PaintingInfo" as
well, where the relationship is 1:1. In this case it makes sense that deleting
a "PaintingFull" should also delete its associated PaintingInfo record.
In this PR a check has been added so that reverse toMany relationships are
protected from deletion,
and if a relevant ObjRelationship is present then deletions are deferred to
it instead.
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