Re: Magritte and many-to-many (possibly) - smallwiki

16 Feb 2009

...
  I wondered if you'd be able to give me a bit of a
Magritte pointer. At the
 moment I'm thinking I need to support a many-to-many relationship, and I
 can't see anywhere Magritte provides such support. I'm wondering (a) whether
 there's support and (b) whether I even need it. 
Have a look at the subclasses of MARelationDescription, depending on
your exact requirements maybe also just MAOptionDescription
subclasses.

...
  I've got two lists, list A is the set of stuff
from which list B could be
 built.  The two lists belong to different objects. There's already support
 for this in MAListCompositonComponent. 
This one is used by MAMultipleOptionDescription.

...
  However, I then need support to go back and put stuff
back from list B into
 list A, in the same form as was previously used to populate it, long after
 the original construction was done. MAListCompositonComponent seems to be
 one-way (ie, the model supports the idea of a list of stuff on it, ie one to
 many). 
As far as I understand this is possible with
MAMultipleOptionDescription. Have a look at the references to this
class in Pier for sophisticated examples on how to use it.

Lukas

-- 
Lukas Renggli
http://www.lukas-renggli.ch