[Zope] How to I use aquisition in an external method?

[Jay, Dylan]

> -----Original Message-----
> From: Martijn Pieters [mailto:mj@digicool.com]
> Sent: Friday, January 21, 2000 8:09 PM
> To: Chris McDonough; Jay, Dylan
> Cc: 'zope@zope.org'
> Subject: RE: [Zope] How to I use aquisition in an external method?
> 
> 
> > -----Original Message-----
> > From: Chris McDonough [mailto:chrism@digicool.com]
> > 
> > Dylan,
> > 
> > I usually pass "this()" in to an external method to get a handle on
> > acquisition from an external method.
> > 
> > e.g.:
> > 
> > <dtml-call "emMyExternalMethod(this())">
> > 
> > def myExternalMethod(context):
> >     if context.folder.attribute:
> >         do something
> >     else:
> >         do something else
> > 
> > this() generally refers to the folder containing the dtml 
> method.  in
> > the external method, you can use acquisition through this object.
> > 
> > "Jay, Dylan" wrote:
> > > 
> > > I want to find out if a callable object exists from a 
> > folder object using
> > > acquisition. ie if I call folder.method() it will be 
> > guaranteed to work.
> > > 
> 
> If your external method signature has 'self' as the first 
> parameter, the
> current object (be it the Folder or DTML Document or some 
> such), will be
> passed in with that parameter.
> 
> So:
> 
>   def MyExternalAttribute(self)
>     return self.acquired_folder.attribute

I guess I didn't really make myself clear. I want to be able to tell whether
a method exists or not. Specifically a method of a certain name that can
exist somewhere in the aquisition path.