Descriptions definition

[Matthias Berth]

Hi :-)

On Mon, May 5, 2008 at 4:51 PM, Dario Trussardi <dtrussardi at tiscali.it> wrote:
>
>
> Hi,
>
> i work with Magritte framework for define more data about one specific
> problem.
>
> Now some data is defined as subclass of another class.
> [...]
> My questions are :
>
> A) What's the best method for not replicate the SuperClass  descriptions ?

You just add the descriptions for the new attributes to the
subclasses. Descriptions are inherited.

> B) If i need to change the label of the priority of one of SuperClass
> description how i can do it ?

Override the superclass method with the modified description.

> C) When i need to do copy of one description and after send to the copy
> specific messages ?
>
> D) When i have a specific description,
>     for example descriptionNazionality based on MASingleOptionDescription,
>     and i have in the "data base" some reference to it ,
>     i can define only one basic descriptionNationality and use it ( or copy
> of it  ) with specific attribute ( label priority accessor )  ?

I don't understand what you want to do. Maybe

  http://onsmalltalk.com/programming/smalltalk/using-magritte-with-seaside/

can give you some hints?

>     What's the solution for have the best performance ?  ( I think to port
> it to GLASS )

I'd advise you to program the solution that is the simplest to
program. Maybe the performance of that solution is completely OK for
your application. For persistence, see also

  http://onsmalltalk.com/programming/smalltalk/simple-image-based-persistence-in-squeak/


Cheers

Matthias