On 4/15/10 05:01 , matth wrote:
Hi,
I keep running into a problem with composition in content types, and
now that I am using Dexterity it is highlighted even more.
There is a general notion that composition in zope is implemented
through containment, although in Archetypes we do have the
DataGridField and CompoundField which allow for composition type
implementations not requiring containment.
Zope interface schemas allow us to represent composition using Object
fields, but currently these are not handled well in add/edit forms.
I would even go so far as to say that they are handled extremely badly
in z3c.form. I did some work recently to improve that situation a bit
for a project I'm working on and I think the result, while still far
from polished, is quite workable: it supports adding extra items without
a page reload but using a simple ajax call, removal of items without
page reloads and looks a lot better as well. You might be able to
extract something that works for you from my codebase at
https://svn.plone.org/svn/collective/NuPlone/trunk/plonetheme/nuplone/z3cform
. The most important bits there are widget.NewMultiWidgetEntry ,
templates/multi_input.pt and templates/object_input.pt .
Wichert.
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