Hi,

You cannot use FM*Link, because it is not a many-to-one/many relation. Just do it like that (replace more or less package by expression and message by constraint in the following code snippet):

Class A: package <MSEProperty: #package type: #Package opposite: #message> <MSEComment: package corresponding to this message'>

^ package

package: new | old | old := package. (old = new) ifFalse: [

old ifNotNil: [ package := nil. "temporarily, to avoid infinite recursion" old message: nil ]. package := new. new ifNotNil: [new message: self] ]

Class B: message <MSEProperty: #message type: #Message opposite: #package> <MSEComment: 'A possible Message corresponding to this package'>

^ self privateState attributeAt: #message ifAbsent: nil

message: new | old | old := self privateState attributeAt: #message ifAbsent: nil. (old = new) ifFalse: [ old ifNotNil: [ self privateState attributeAt: #message put: nil. "temporarily, to avoid infinite recursion" old package: nil ]. self privateState attributeAt: #message put: new. new ifNotNil: [ new package: self] ]

Vincent

-----Message d'origine----- De : moose-dev-bounces@list.inf.unibe.ch [mailto:moose-dev- bounces@list.inf.unibe.ch] De la part de Anne Etien Envoyé : lundi 4 avril 2016 16:22 À : Moose-related development Objet : [Moose-dev] Creating opposite in case of 1:1 Association

Hi,

I got a Constraint that references a single Expression max and an Expression can be referenced by a single Constraint. So there is a one-to-one relationship between Expression and Constraint. Expression has a constraint reference to Constraint whose opposite is expression. How can I automatically update the opposite, when I don’t use FMMultiValueLink ? Do I need to do it by myself programmatically?

Thanks in advance for your help.

Anne

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