4 Apr
2016
4 Apr
'16
4:31 p.m.
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(a)list.inf.unibe.ch [mailto:moose-dev-
bounces(a)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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