[Zope] DTML Doc and Python scripts and aq_parent

[Chris Kratz]

Thanks for the response Dieter,

> In your case, the reason almost surely is, that "DTML Document" tries
> to prevent acquisition through itself (it pushes "self.aq_explicit"
> and not "self" onto the namespace). This usually means, that objects
> are not found via the DTML Document but (as for DTML Methods) via
> the client. Exceptions are the DTML Documents own attributes
> and when "aq_explict" does not do what it is "supposed" to do
> (--> mailing list archives; problem report from me).

Hmmm, so the short answer is, you can't.  My continued experimentation has
indeed shown this to be true.  It appears that the only way to get the
information is to create a new property (ie page_title) that would then show
up in the namespace (because it isn't replaced by any of the properties in
CommonStuff), pass it in via a parameter, or use the properties of the
containing folder.  I don't particularly like any of the options, but I
think I will go with the last one for now.

Thanks for the help,

-Chris
------------------------------
Chris Kratz
chris.kratz@vistashare.com

----- Original Message -----
From: "Dieter Maurer" <dieter@handshake.de>
To: "Chris Kratz" <chris.kratz@vistashare.com>
Cc: <zope@zope.org>
Sent: Friday, November 30, 2001 4:30 PM
Subject: Re: [Zope] DTML Doc and Python scripts and aq_parent


> Chris Kratz writes:
>  > I'm trying to wrap my head around acquisition once again.  Each time I
think
>  > I get it, another curve ball gets me.  If anyone has any pointers I
would
>  > appreciate it.
>  >
>  > I have the following structure:
>  >
>  > Root
>  >  + FolderA
>  >      + Folder A1
>  >           DTML_Doc w "Really Nifty Title"
>  >   + CommonStuff
>  >       + PythonScript
>  >
>  > inside of DTML_Doc, there are several lines of code that look something
like
>  > this:
>  >
>  > <dtml-with CommonStuff>
>  >   <dtml-var PythonScript>
>  > </dtml-with>
>  >
>  > In the python script I have the following
>  >
>  > print context.title                                 # Prints
'PythonScript'
>  > print context.aq_parent.title                 # Prints 'CommonStuff'
>  > print context.aq_parent.aq_parent.title #  Prints Folder A1  ???Huh???
>
> You know Shane's "show_aq" External Method? It provides for a visual
> representation (ASCII art!) of the acquisition structure and is
> a valuable aid in understanding acquisition.
>
> In your case, the reason almost surely is, that "DTML Document" tries
> to prevent acquisition through itself (it pushes "self.aq_explicit"
> and not "self" onto the namespace). This usually means, that objects
> are not found via the DTML Document but (as for DTML Methods) via
> the client. Exceptions are the DTML Documents own attributes
> and when "aq_explict" does not do what it is "supposed" to do
> (--> mailing list archives; problem report from me).
>
>
> Dieter
>