Sometimes it will work as you expect, other times it will simply not use the new value, other times you will get optimistic locking failures (IF you have locking turned on on the FK).
This is guaranteed to happen if you have FKs marked as class properties, but I can see it happening here too. The reason flattening works with many-to-many relationships is that the relationships to the join table are NOT class properties.
On Sun, 02 Mar 2014 16:05:26 +0100
Actually I think I solved the problem by using the relationship
keypath in the qualifier:
if ( cd.toOneRelationshipKeys().contains(sv1)) {
EORelationship relation1 = entity.relationshipNamed(sv1);
v1Qual= new EOKeyValueQualifier(relation1.relationshipPath(),
EOQualifier.QualifierOperatorEqual, record); }
NSArray objectsInRow =
EOQualifier.filteredArrayWithQualifier(relevantObjects, v1Qual);
That seems to work.
So, it seems that you fixed the problem by not accessing the
relationship via the flattened path. That would work.
Flattening a to-one relationship is possible, though certainly not the
common use case.
It is likely that you fell afoul of the rule that the inner
relationships in the chain of the flattened relationships should not be
class properties. If you took a set of to-one relationships that were
not class properties, you can flatten them. It would just be strange to
create the to-one relationships in that manner.
When I have a common path through some set of relationships, I usually
provide support for that in the class by creating a final static of the
qualifier, or add methods to get across the set of joins, or both.
- ray
Le 2 mars 2014 à 14:39, Philippe Rabier <
email@hidden> a écrit :
I don’t understand why you try to flatten a to-one relationship.
You can flatten an attribute or a many2many relationship.
Instead of calling classe().lycée(), I can just call lycée().
It is also useful to me because I I dynamically present the relations
to the user for selection in a popup menu. So I need a direct
relationship to Lycée.
Creating a many2many relationship is pretty straightforward: when
you create a relationship between 2 entities, you choose to many on
both sides, give a name to the join entity and check “flatten”.
Regarding your code, I don’t get you when you say “not work well
with this relationship”. Is it the one to try to flatten? If you
have issues with the relationship, it’s not surprising you don’t
get the expected results, right?
Why the test "if ( cd.toOneRelationshipKeys().contains(sv1)) "? I
suppose you get an exception before if sv1 is not a valid
relationship key…
Because I build different qualifiers if the relationship is a to-many
(I didn't show it in the code I sent, because it is not relevant).
And I’m a bit surprised you still use accented characters (Lycée).
That’s something I would never play with…
You are right, but this is D2W app, and I thought it would save me
writing a lot of displayNameForProperty rules.
Thanks for your reply
JPM
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