[Zope] getattr default

Dieter Maurer dieter@handshake.de
Mon, 29 Oct 2001 22:29:28 +0100 (CET)

Mitch Model <model@mpi.com> (by way of Mitchell Model) writes:
 > What's wrong with the 'getattr' call in this DTML method?  I get an
 > error message:  "Name not found or not allowed undefined." (using ZDebug).
 > (The problem is not the choice of attribute names -- I get it whatever I type
 > that isn't an attribute in the REQUEST.)  If I arrange to get into pdb from
 > this method, the getattr expression works fine.  Is this a Zope bug? 
 > _____________________________________________________________________
 > <html>
 > <body>
 > REQUEST does
 > <dtml-if expr="not _.hasattr(REQUEST,'undefined')">
 > not
 > </dtml-if>
 > have the attribute 'undefined'.
 > <p>
 > value = <dtml-var expr="_.getattr(REQUEST, 'undefined', 'nothing')">
 > </body>
 > </html>
 > _____________________________________________________________________
"_.getattr" does not work with "REQUEST", because "REQUEST" is
primarily a mapping and does only expose its items as attributes, too.
More precisely, its "__getattr__" (which is called by "_.getattr")
is mapped to "REQUEST"'s "__getitem__" and this raises
"KeyError" instead on "AttributeError".
But "_.getattr" only catches "AttributeError" and propagates "KeyError".

I think this is a bug in "ZPublisher.BaseRequest.BaseRequest".
It should map "__getitem__"'s "KeyError" into "__getattr__"'s "AttributeError".

Would you like to write a tracker item?