-----Original Message----- From: Lalo Martins [mailto:lalo@webcom.com] Sent: Sunday, October 24, 1999 3:29 PM To: Dave Wood Cc: zope-dev@zope.org Subject: [Zope-dev] Re: Renderable Base ZClass

On Sun, Oct 24, 1999 at 11:40:05AM -0300, Dave Wood wrote:

...

Hi,

More technical view, if anyone cares:

What Renderable does is basically define a __str__ method, so that we can control what is displayed when we do <dtml-var obj> (and obj is of a class derived from Renderable).

But __str__ is a pure-python feature, so it doesn't get a context (REQUEST etc).

As you've discovered, you cannot pass arguments to __str__, therefore you can't pass REQUEST. You can, however, try to acquire a context by checking yourself for REQUEST: def __str__(self): try: url = self.REQUEST['URL'] except: raise 'No Context', 'I cant acquire!!' This works becuase the instance of your ZClass is an Acquisition.Implicit acquirer. -Michel