[Zope] Difficult question related to creating instances of

[complaw@hal-pc.org]

I ought to add that I want to present the _content developer_ with the list of
paradigms that exist within the calling folder _at the time the class instance
is made_.  I just don't know any way to get a list of the contents within the
calling folder into HTML code that makes up the web page for the initial
properties of the ZClass.  As far as I can tell, the "folder" for creating a
ZClass instance is different from the calling folder.  Hence my problem.

This might be solved if there is some mechanism for getting content from the
calling folder _before_ calling the zclass_addForm so that the creation of that
web page can reflect the contents of the calling folder.  That would be quite a
trick.

Ron



> > "Ronald L. Chichester" wrote:
> >  
> > > The bottom-line question is, can I make a list for an HTML list box with
> > > the contents of the folder that calls the addForm method?
> > 
> > I found that the power of using ZClasses was in being able to
> > define a META TYPE.  This gives you a lot of handling
> > capabilities in many situations.  So instead of having one Zclass
> > with a boolean to select whehter it's an issue or a paradigm. I
> > would create two separate Classes.  The overhead is pretty small
> > compared to what you get back in power.
> 
> I am using two ZClasses.  One for the paradigm (which has one set of
properties)
> and another for the issues (with yet another set of properties).  Both classes
> do different things.  They are, however, related in that they reference each
> other.  The question then becomes how to contain those references.  One of the
> classes has to maintain a reference.  Note, one issue can reference multiple
> paradigms.  Each paradigm, in turn, may reference several issues.  The
> reference-back (when viewing the paradigm) can be done (I think) through dtml
by
> picking out those issues that contain the link to the paradigm in question.  I
> wanted to adopt this technique because it is scalable and flexible. 
> 
> I could have created a set of classes with direct links (e.g., boolean
> properties that indicate whether a particular issue contains one of the
> paradigms.  This would be fine for one subject (the subject being a set of
> paradigms and issues).   However, I would have had to derive a whole new class
> for each subject.  The method I'm trying to work out here would be flexible
> enough to work on mulitiple subjects without having to change/create a new
> product.  All the content developer need to is pick the same product whenever
he
> wanted to set up something like this.
> 
> 
> > 
> > For the association part, your issue will need a lines property
> > that will contain the associated paradigm ID's. When you add an
> > issue and select the paradigms from the multi-select then your
> > form handler will have a list of paradigms to fill this property
> > with.
> > 
> 
> Correct.  That is the goal.  The problem comes on how to load the list of
> paradigms into the add_form/edit_form for the ZClass.
> 
> > Do the paradigms available to an issue span mutiple folders or
> > are they all co-located?  
> 
> Yes.  All of the paradigms and issues reside in the same folder (that is
called
> a "subject" folder).  In fact, we don't want to mix paradigms/issues with
other
> folders.
> 
> 
> > The former gets pretty tricky and is
> > better implemented with a URL vs. just the ID.  
> 
> I would agree to that.
> 
> Thanks,
> 
> Ron
> 
> 
> 
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