Cannot set more than one to-one relationship to null.
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Key: CAY-901
URL: https://issues.apache.org/cayenne/browse/CAY-901
Project: Cayenne
Issue Type: Bug
Components: Cayenne Core Library
Affects Versions: 3.0
Reporter: Kevin Menard
Assignee: Andrus Adamchik
Fix For: 3.0
Given three entities Person, Place, Thing. Person has a to-one relationship to
Place. Person has a to-one relationship to Thing. Calling the following code
does not work:
person.setPlace(null);
person.setThing(null);
person.getObjectContext().commitChanges();
The place will be set to null, but the thing will not. The problem appears to
be in DataDomainDBDiffBuilder#arcDeleted(). There, if the currentArcDiff is
null, a new one is created and the arc deletion noted. If the currentArcDiff
is not null, however, an arc deletion will only be added if the arcId has
already been added to the map. In the case of the setThing() call, the
currentArcDiff will not be null, containing the place deletion, but there will
be no entry for the thing deletion. The thing deletion will not be added
because of the blocking condition.
It appears that either the condition needs to be removed or refined to account
for such a situation. Given that I'm not clear on what the original intent
was, it's hard to recommend a clear solution. Removing the condition fixed the
problem in my codebase.
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