[Zope] Rendering files with exception

Dieter Maurer dieter@handshake.de
Fri, 5 Jul 2002 20:05:02 +0200

Marius Gedminas writes:
 > On Wed, Jul 03, 2002 at 08:05:40PM +0200, Dieter Maurer wrote:
 > > If you want to learn more about "aq_explicit", read
 > > 
 > >   <http://www.dieter.handshake.de/pyprojects/zope/book/chap3.html>
 > I couldn't find any mention of aq_explicit there.  A google search on
 > aq_explicit site:www.dieter.handshake.de found no matches either.
 > Grepping around the CVS version of the Zope Book also did not find any
 > results.
 > What am I missing?

  Look at section "3.2 Acquisition". You learn their about
  "implicit" and "explicit" acquisition wrappers.

  "aq_explicit" takes an implicit acquisition wrapper and
  returns the corresponding explicit acquisition wrapper,
  i.e. the one with the same "aq_self" and "aq_parent".
  As the result is an explicit wrapper, attribute lookups
  are only performed (automatically) in "aq_self" and
  no longer in "aq_parent". This gives you the expected
  result as long as "aq_self" is not itself a wrapped object.

  In simple case, "aq_self" is not a wrapper, in more complex
  cases, it can be, however.