[Zope-CMF] [dev] Actions: lazy dict not working with DTML?

[Dieter Maurer]

yuppie wrote at 2004-8-2 18:21 +0200:
>Since last week listFilteredActionsFor() returns ActionInfo objects 
>instead of dictionaries. I tried to implement ActionInfo as a lazy dict 
>to defer expensive processing of TALES expressions.

What is a lazy dict?

>This seems to work with the ZPT skin, but not with the old DTML skin.
>
>    <dtml-in user_actions mapping>
>     <a href="&dtml-url;"><dtml-var name></a><br>
>    </dtml-in>
>
>Looks like this code bypasses __getitem__, but I don't understand how 
>this works because I'm not a C programmer and can't read the 
>TemplateDict code.

This is unlikely.

With the "mapping" keyword, the object itself is pushed
onto the "TemplateDict" (it is a stack of namespaces);
without it, it is wrapped before pushing into a "ClientDict" (I think)
which maps "__getitem__" to "__getattr__".

The "TemplateDict"s "getitem" asks each namespace on its stack
for the name using its "__getitem__" until it succeeds or reaches
the end of the stack.

When you send me a code fragment showing how your
"lazy dict" looks and works in principle, I can try to
analyse the problem.

-- 
Dieter