[Zope] Acquisition mysteries

[Rik Hoekstra]

> -----Original Message-----
> From: zope-admin@zope.org [mailto:zope-admin@zope.org]On Behalf Of Rik
> Hoekstra
> Sent: Wednesday, August 25, 1999 4:35 PM
> To: Heiko Stoermer; zope@zope.org
> Subject: [Zope] Acquisition mysteries
>
>
>
>
> > -----Original Message-----
> > From: stoermer@migserv.augsburg.mig.net
> > [mailto:stoermer@migserv.augsburg.mig.net]On Behalf Of Heiko Stoermer
> > Sent: Wednesday, August 25, 1999 3:13 PM
> > To: Rik Hoekstra
> > Subject: Re: [Zope] manage_clone problem
> >
> >
> > thanks a lot, the PARENTS[0] expression solved my problem.
> > I you have time: could you, in short, explain to me why that worked?
> > (yes, I am a newbie...)
> >
> > Greetings,
> > Heiko
>
>
>
> OK, I'll try, though it's complicated, and I do not completely understand
> myself.... Given the following folder structure:
>
> root - DTML Method
>   |    DTML Document
>   |
> current folder
>
>
>
> The famous acquisition 'enables' an object to call a property
> from a parent
> object as if it were its own. If you use a DTML Method the
> calling object is
> the folder that you call from (current folder in the example), because the
> DTML method 'acts' as if it were only a property of the current folder. So
> if you call manage_clone from a DTML Method it 'thinks' it is called from
> the current folder. It then 'clones' the object to the current folder.
> A DTML Document, however, is an object of its own, and it can't contain
> other object. So if you call manage_clone from a DTML Document it will try
> to clone it to  itself, and *for one reason or another* ends up with the
> folder it's called from.


Woops, a typo. What I meant was: it ends up with its original folder (the
root folder in the example)


>Apparently acquisition thinks that is its nearest
> parent... Could someone with fuller understanding of acquisition explain
> this??? Is this a bug or a feature?
>
> If you add a <dtml-with expr="PARENTS[0]"> the object manage_clone is not
> called from the DTML Document, but from its nearest parent, which is the
> folder in the context of which it is called (current folder in
> the example).
> This works (at least for me) as expected, but why this parent is not found
> automatically escapes me...
>
> Rik
>
>
> >
> > Rik Hoekstra wrote:
> >
> > > To:                     Zope Mailing List <zope@zope.org>
> > > Subject:                [Zope] manage_clone problem
> > >
> > > > I have created a DTML Document in the root directory that is
> > supposed to
> > > > be used from all subdirs of my web application.
> > > > This document contains a call to manage_clone(), which
> should copy an
> > > > object from some other folder into the _current_ folder.
> > > > But as the DTML is stored in the root directory, manage_clone always
> > > > clones into the _rootdir_, too.
> > > >
> > > > this is the call:
> > > > <!--with "manage_clone(foo.bar,'new_id',REQUEST)"-->
> > > >
> > >
> > > I have done something very similar, with success. I only used a DTML
> > > method to do the manage_cloning. As this seems to be a namespace
> > > issue, you could try to change to a DTML method or perhaps a
> > > <dtml-with "PARENTS[0]"> would help.
> > >
> > > Rik Hoekstra
> > >
> > > _______________________________________________
> > > Zope maillist  -  Zope@zope.org
> > > http://www.zope.org/mailman/listinfo/zope
> > >
> > > (To receive general Zope announcements, see:
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> > >
> > > For developer-specific issues, zope-dev@zope.org -
> > > http://www.zope.org/mailman/listinfo/zope-dev )
> >
> > --
> > Heiko Stoermer
> > MIG Augsburg
> >
> >
> >
> >
>
>
>
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