Our story for re-using content types

> >   from Bluh import ClassA
> >  def MyClassA(ClassA):
> >       pass
> > 
> > What happens to:
> >   * all the installation code you use for ClassA
> >   * how meta_type, portal_type, archetype_name of
the classes work,
> > how they show up in add menus (both? by waht
name?)
> >   * any other interactions between ClassA and
other portal objects
> > (e.g., if it looks up info in a property sheet, or
a vocabulary
> > manager, etc.)
> 
> My advice is - don't do this unless you have a really
good reason  
> to.


Don't the same questions apply to when you re-use a content
type, though? In
which case it isn't a mere Python wrapper / module alias
that's going on. It
seems like to create a good Archetype that you can reuse,
subclass, etc. you
have to worry about the above things and code it very well
to start with so that
subclassing, etc. later on is simple.

For instance, it seems like this would involve making
generic installation code
with a method that could be called by a newly defined
content type that
subclasses the original content-type. (I half-shudder
thinking about subclassing
RichDocument, for instance, given the installation code it
requires. Although
actually that is fairly clean so that's not a full
shudder.)

And as for coding the relationship between a class and other
portal objects, I
suppose that these should all happen inside methods that can
be overriden, for
instance

  def _lookupDataFromPropertySheet(self):
      return getToolByName(self,
'portal_properties').new_props.getProperty('data')

  def processData(self):
      return 'Data: %s' %
self._lookupDataFromPropertySheet()

rather than

  def processData(self):
      return 'Data: %s' % getToolByName(self,
'portal_properties').new_props.getProperty('data')

I don't know though, I feel like I'm making stuff up here.

Peace,
George



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