Thanks Leo, this is very helpful. It should probably be in a HOWTO
> -----Original Message-----
> From: Leonardo Rochael Almeida [mailto:[EMAIL PROTECTED]]
> On Tue, 2003-01-14 at 01:01, Bjorn Stabell wrote:
> > > Bjorn Stabell wrote:
> > I would like
> > <dtml-var content>
> > <dtml-with content>...
> > <dtml-if content>
> > to call different functions. The first renders the object,
> the second
> > returns a mapping of the content's attributes/properties, the third
> > checks for "trueness" of the content. Rendering a content
> could be an
> > expensive operation and I don't want to do it when doing
> dtml-with and
> > dtml-if.
> you can do that by having your object be non-callable (or
> returning self on __call__) and implementing __str__ where
> you can have access to the REQUEST thru self.REQUEST.
> <dtml-with content> works as expected because you're getting
> the object itself. To make <dtml-if content> work you should
> implement __len__ (if your object implements sequence or
> mapping, which it probably doesn't) or __nonzero__. Read the
> python docs for details on the implementation of these methods.
> Cheers, Leo
> Ideas don't stay in some minds very long because they don't
> like solitary confinement.
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