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Posted to commits@cayenne.apache.org by "Andrus Adamchik (Jira)" <ji...@apache.org> on 2022/07/03 10:28:00 UTC

[jira] [Created] (CAY-2739) Mapping Proposal: replace "toDepPk" with "fk"

Andrus Adamchik created CAY-2739:
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             Summary: Mapping Proposal:  replace "toDepPk" with "fk"
                 Key: CAY-2739
                 URL: https://issues.apache.org/jira/browse/CAY-2739
             Project: Cayenne
          Issue Type: Improvement
            Reporter: Andrus Adamchik


"toDepPk" is a DbRelationship property that hints that Cayenne should take the value of the join on the source side and propagate it to the target side.  It only applies to PK-to-PK relationships.

It is an artificial construct with nothing equivalent on the DB side, so it may be confusing as to what it means. Moreover it is limited to PK-PK relationships, meaning that we can't propagate values if the source is not a PK.

I suggest that we replace "toDepPk" with a complementary "fk" property that is both well-understood and equally applies to every relationship. "toDepPk" will be a special case of "fk=false" relationship. In most cases it can be auto-calculated (if one side is a PK, and another one is not), so hopefully it will not create extra mapping work.



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