[Zope] DTML in Product

[Terry Hancock]

I'm converting a through-the-web prototype to a product.

Following the conventions of the examples I've seen
and the ZDG (and previous tutorials on products), I'm
using DTML "manage_add..." forms.  However, I have
a number of these with shared information, so it
would be much more convenient to factor out the common
content into a separate DTML file, which I've done.

To be more specific, I have an add-form for my
"GalleryArt" object, called addGalleryArt,
which includes a file add_contrib_dtml which 
has a common portion of the add form used by
several objects in the product.

However, I can't figure out how to include the
component DTML in the DTML form.

I'm using DTMLFile() to get the original DTML, which
is then registered in my __init__.py.  I've used
the same DTMLFile() method to capture the shared
component. So I now have a reference to add_contrib_dtml
in the Python module which defines GalleryArt.

Now, in order to get this into the namespace for
the DTML form, I tried defining it like this:

add_contrib_dtml = DTMLFile('dtml/add_contrib', globals())

manage_addGalleryArt = DTMLFile('dtml/addGalleryArt', globals(),
			add_contrib_dtml=add_contrib_dtml)

(there's a line like <dtml-var add_contrib_dtml> in
 the dtml/addGalleryArt.dtml file).

However, when I call this form in Zope by trying to add
the GalleryArt object, I get an AttribError exception
thrown from add_contrib which says it can't find "_aq_parent".

This presumeably stands for "acquisition parent" and is
certainly not referred to explicitly by me -- so it has
to be something that DTML expects Zope to provide it with.
So presumeably it did find add_contrib_dtml, but it
isn't happy with its namespace.

This must be because the DTML files are not in the Zope
hierarchy, but are instead in my Product, but I then
don't understand why the DTML forms worked in the first
place.  SO -- the question I'm asking is how was I
_supposed_ to do this?  (How) can I build a DTML hierarchy
like this inside my Product?

Thanks for any ideas!

Terry

-- 
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Terry Hancock
hancock@anansispaceworks.com       
Anansi Spaceworks                 
http://www.anansispaceworks.com 
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