one-to-one links with FAME

> Yes, there is an example in:
> FAMIXAssociation>>next
> FAMIXAssociation>>previous
>
> In this case you don't need to use FMMultivalueLink/FMMultiMultivalueLink/etc links. You just need to say to the non-derived side (in this example FAMIXAssociation>>previous) to also set the derived side (in this example FAMIXAssociation>>next)
>
>
>
> On Fri, Mar 22, 2013 at 6:10 PM, Usman Bhatti <[hidden email]> wrote:
> Hello,
>
> Does FAME allow to create one-to-one relationship with automatic update of the back links? So far, I have seen two entities FMMultivalueLink (one-to-many) and FMMultiMultivalueLink (many-to-many) and their examples.
>
> I have an elements and its behavior in separate entities and I would like to  create and update one-to-one links between these two entities. I haven't found any example in Moose.
>
> tx,
> Usman
>
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>
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>
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> Andre Hora
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> I would like to have such behavior with first class instance variables.
>
> Stef
>
> On Mar 24, 2013, at 9:51 AM, Usman Bhatti <[hidden email]> wrote:
>
>> tx both. That helps.
>>
>>
>> On Sat, Mar 23, 2013 at 3:08 PM, Tudor Girba <[hidden email]> wrote:
>> Not quite enough of an explanation :).
>>
>> Indeed, the case you mentioned is a good case study. But, the question is how do we ensure that when setting previous:, we  also set the next: of the previous as well.
>>
>> Like Usman observed, we have no support from Fame here, but we can do it in the setter. In our case, the magic is in the previous: setter:
>> previous: anAssociation
>>         previous ~= anAssociation ifTrue:
>>                 [ | old |
>>                 old := previous.
>>                 previous := anAssociation.
>>                 old notNil ifTrue: [ old next: nil ].
>>                 anAssociation notNil ifTrue: [ anAssociation next: self ] ]
>>
>> So, because of that, the following code returns true:
>> previous := FAMIXAssociation new.
>> next := FAMIXAssociation new.
>> next previous: previous.
>> previous next = next
>>
>> Cheers,
>> Doru
>>
>>
>> On Mar 23, 2013, at 1:04 PM, Andre Hora <[hidden email]> wrote:
>>
>> > Yes, there is an example in:
>> > FAMIXAssociation>>next
>> > FAMIXAssociation>>previous
>> >
>> > In this case you don't need to use FMMultivalueLink/FMMultiMultivalueLink/etc links. You just need to say to the non-derived side (in this example FAMIXAssociation>>previous) to also set the derived side (in this example FAMIXAssociation>>next)
>> >
>> >
>> >
>> > On Fri, Mar 22, 2013 at 6:10 PM, Usman Bhatti <[hidden email]> wrote:
>> > Hello,
>> >
>> > Does FAME allow to create one-to-one relationship with automatic update of the back links? So far, I have seen two entities FMMultivalueLink (one-to-many) and FMMultiMultivalueLink (many-to-many) and their examples.
>> >
>> > I have an elements and its behavior in separate entities and I would like to  create and update one-to-one links between these two entities. I haven't found any example in Moose.
>> >
>> > tx,
>> > Usman
>> >
>> > _______________________________________________
>> > Moose-dev mailing list
>> > [hidden email]
>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>> >
>> >
>> >
>> >
>> > --
>> > Andre Hora
>> > _______________________________________________
>> > Moose-dev mailing list
>> > [hidden email]
>> > https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>
>> --
>> www.tudorgirba.com
>>
>> "Every now and then stop and ask yourself if the war you're fighting is the right one."
>>
>>
>>
>>
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>
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