Reverse relationships may not be correctly set if inheritance is used.
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Key: CAY-1008
URL: https://issues.apache.org/cayenne/browse/CAY-1008
Project: Cayenne
Issue Type: Bug
Components: Cayenne Core Library
Affects Versions: 3.0
Reporter: Kevin Menard
Assignee: Andrus Adamchik
Given two entities, Employee and Address, such that there is a one-to-many
relationship between the two, it may be possible that reverse relationships are
not fully set if inheritance is used.
For example, let's say that HomeAddress extends Address, then the following
fails:
Employee e = context.newObject(Employee.class);
Address a = context.newObject(Address.class);
a.setToEmployee(e);
assertEquals(1, e.getAddresses().size());
assertEquals(0, e.getHomeAddresses().size());
HomeAddress ha = context.newObject(HomeAddress.class);
ha.setToEmployee(e);
assertEquals(2, e.getAddresses().size());
assertEquals(1, e.getHomeAddresses().size());
The last assertion fails as e.getHomeAddresses() will return an empty list.
On the face of it, the problem is that the ObjRel "addresses" is being set
rather than "homeAddresses". This is due to how
ObjRelationship#getReverseRelationship() determines reverse relationships. It
does so by inspecting the relationship structure and if there's a match,
returns it. "addresses" and "homeAddresses" have the same structure and
"addresses" is the first match found and returned.
Simply reversing order or other similar tricks won't really do anything more
for us though. The real issue seems to be how to deal with multiple ObjRels
that match to the same DbRel. Each ObjRel does need to be updated in order for
the graph to remain consistent.
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