MAAdaptiveModel

> > I am creating a model class that only has a few core attributes and
> > will allow the user to create descriptions through a description
> > editor.  Is subclassing MAAdaptiveModel a smart alternative to using
> > customDescription on the class side (as seen in Exercise 18 in
> > magritte-solutions.pdf)?
>
> Yes, I think that's a good solution.
>
> Sometimes this is not possible, so a stateful trait -- to turn any
> class into an adaptive model --  would be a really a cool thing to
> have. I basically end up re-implementing the few methods necessary
> over and over again.
>
> Cheers,
> Lukas
>
> --
> Lukas Renggli
> http://www.lukas-renggli.ch
>
>
>
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>

>
> On 19 Apr 2007, at 22:56, Chad Nantais wrote:
>
> > Subclassing MAAdaptiveModel works with the MADescriptionEditor.
> >
> > However, when I try to get an edit for for my model with "mymodel
> > asComponent", none of the descriptions appear in the form, not even
> > the ones that are hard-coded into the class-side.  BTW, I have cleared
> > caches and initialized my model class.
>
> MAAdaptiveModel doesn't take the hard-coded class side descriptions
> into account as it overrides #description without calling super. You
> can change that of course, but doing something like I did in the
> class PRForm in the package Pier-Forms.
>
> description
>         "Answer a generic description with the properties of the structure."
>
>         ^ (MAContainer withAll: super description) , self metamodel
>
> readUsing: aDescription
>         ^ (self metamodel includes: aDescription)
>                 ifFalse: [ super readUsing: aDescription ]
>                 ifTrue: [ self model at: aDescription ifAbsent: [ aDescription
> default ] ]
>
> write: anObject using: aDescription
>         (self metamodel includes: aDescription)
>                 ifFalse: [ super write: anObject using: aDescription ]
>                 ifTrue: [ self model at: aDescription put: anObject ]
>
> In this example I store the adaptive descriptions in the variable
> metamodel. You need change your description editor to reflect that.
>
> HTH,
> Lukas
>
> --
> Lukas Renggli
> http://www.lukas-renggli.ch
>
>
>
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> SmallWiki, Magritte, Pier and Related Tools ...
> https://www.iam.unibe.ch/mailman/listinfo/smallwiki
>