Jadon Hansell created CAY-2890:
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Summary: Vertical Inheritance: Updating 1-Many with FK on Child
Table Fails
Key: CAY-2890
URL: https://issues.apache.org/jira/browse/CAY-2890
Project: Cayenne
Issue Type: Bug
Affects Versions: 4.2.2, 5.0-M2
Reporter: Jadon Hansell
If there is a one-to-many relationship where the foreign key is on the child
table in a vertical inheritance scenario, updating the relationship will
sometimes delete the row on the child table or try to insert a row with mostly
null values into the child table instead of updating it.
The issue seems to happen when the update to the has-many side of the
relationship is processed first in
`ArcValuesCreationHandler.processFlattenedPath`. When the update to the
belongs-to side of the relationship is processed first it issues an update as
normal, then skips the has-many side because the inverse relationship has
already been processed.
As a side note, when I implemented a breaking test for this, on one of the test
cases cases the GraphBasedDbRowOpSorter throws an error saying that there is a
`Cycle detected in list for keys`.
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