I have two objects setup tied by a bidirectional one-to-one
optional relationships.
Problem:
When I use "addObjectToBothSidesOfRelationshipWithKey"
only half of the relationships get updated. I crafted the following
code that does update both sides
I don't undestand why "addObjectToBothSidesOfRelationshipWithKey"
doesnt' work and suspect I screwed up somewhere.
EOCustomObject.addObjectToBothSidesOfRelationshipWithKey(obj, key) is
only taking care of both sides if it can find the reciprocal (also
called inverse or back-) relationship to the relationship you've
specified as key. To do that,
addObjectToBothSidesOfRelationshipWithKey is using
EORelationship.inverseRelationship() which searches the destination
entity for a relationship that points back to our entity using a
reciprocal join.
For example, if we have a relationship from A to B using the join
[A.a_id, B.a_id] (in other words, B has a foreign key a_id for a to-
many relationship from A to B),
addObjectToBothSidesOfRelationshipWithKey is looking for a back-
relationship with the join [B.a_id, A.a_id] (in other words, we're
looking for a to-one relationship from B to A using the same keys/
attributes/columns).
In your case with the optional one-to-one relationship, the joins are
[A.b_id, B.b_id] and [B.a_id, A.a_id] which are not reciprocal, i.e.
EORelationship.inverseRelationship() can't identify these joins as
being related to each other. You didn't "screw up" - this is just a
case where you need to explicitly maintain both sides of the
relationship. One way to do that would be to overwrite
addObjectToBothSidesOfRelationshipWithKey in A and B to check if the
key is for a one-to-one relationship and then specifically deal with it.
Christian
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