[Zope-dev] Re: Acquisition Questions

[Kent Polk]

On 19 Apr 1999 21:48:36 GMT, Kent Polk wrote:
[...]
>What I have done is to build a hierarchy of object instances which
>correspond to the subdirectories and files contained within that
>file-system. Not by happenstance, each instance highly resembles a
>TinyTable and is query-able in the same fashion as TinyTables.

[...]

>Question #2:
>------------
>
>How do I point a DTML method at the correct object ?


Hmmm... re-re-reading ExtensionClass.stx, I ran across this statement:

 "Currently, when accessing a class instance attribute, the attribute
 value is bound together with the instance in a method object *if
 and only if* the attribute value is a python function.  For some
 applications, we might also want to be able to bind extension
 functions, or other types of callable objects, such as HTML document
 templates [2]."

I think this describes my problem where my instance mapping
a.b.c.d.e() can call Python methods and attributes, but DTML
can't locate the methods or attributes.

I suspect that I am not instantiating my objects correctly, but
don't see what I'm supposed to be doing.

Currently, as a parent object determines its children, I have it
instantiate them and then call their 'load' method which (recursively)
has them locate their children, instantiate and load them, etc.

    def _setObject(self,id,object):
        setattr(self,id,object)
        try:    t=object.meta_type
        except: t=None
        self._objects=self._objects+({'id':id,'meta_type':t},)

    self._setObject(name, SubDir(name))
    obj = getattr(self, name)
    obj.load()

my classes are:
 class Connection(ExtensionClass.Base):
 class SubDir(Acquisition.Implicit) :
 class Database(Acquisition.Implicit) :
 class PedSysFile(Acquisition.Implicit) :
and all but the last can contain children.

Does anyone have an example of how objects are supposed to be
recursively instantiated using ExtensionClass? I've seen a few
potential examples, but each is instantiated differently and doesn't
provide an explanation for why they are instantiated differently.

Thanks Much!
Kent