Hi, Welcome to Zope :) -----Original Message----- From: Chris Fassnacht <cfassnacht@ssc.wisc.edu> To: zope@zope.org <zope@zope.org> Date: Monday, September 06, 1999 6:16 PM Subject: [Zope] Two newbie questions

1. Object reference across hierarchies.

If I have a folder structure like this:

A / \ B C / \ / \ D E F G

Then I can reference an object in A, B, or D from A, B, or D using <dtml-var objectid>. But if I try to reference something in G from B, for instance, I get a Zope error.

I'm not fully up to speed on the idea of namespaces, but I get the feeling that this is the source of my problems. Unfortunately, I'm not sure how force a reference to something in a different namespace using only its object id (that is, without having to reproduce the full url path). Could someone enlighten me?

In Zope, the term "acquisition" is used to refer to objects being "acquired" from higher up in the hierarchy. An object in G can access anything in A directly by object ID, as can something in D. To get to G from B, you would need to do something like this: <dtml-comment>Let's start at the root</dtml-comment> <dtml-with "PARENTS[-1]"> <dtml-with C> <dtml-with G> <dtml-var some_property> </dtml-with> </dtml-with> </dtml-with> Note that you can also do this in many circumstances: <dtml-var "PARENTS[-1].C.G.some_property">

2. Looping a lines property

I've been trying to use the <dtml-in> loop structure to go through the entry in an custom ZClass object's lines property. But I'm not sure of the syntax (I've looked through most of the documentation and can't find more than a minimal description on pg. 44 of the Zope Conten Manager's Guide), and what I've tried so far isn't working.

I can access individual line items using <dtml-var "objectid.linesid[n]">, but was hoping to avoid having to create an increment variable for n, test, increment, etc., since the <dtml-in> structure looked so slick.

What I'm trying to do is to maintain a list of object ids in an object's lines property and then generate links (<a href=>'s) from the list. So, I could also use some direction in using the referenced object id in the lines property to access its properties (title, mostly).

<!--untested--> <dtml-in linesid> <a href="&dtml-sequence-item;"><dtml-var "_[_['sequence-item']].title"></a><br> </dtml-in> (If &dtml-sequence-item; doesn't work, just do <dtml-var sequence-item>) sequence-item will contain each of the lines in turn. If you do _['sequence-item'], you will get the value of sequence-item (ie, the object id). If you do, _[_['sequence-item']], it will look that objectid up in the namespace. Kevin