-----Original Message----- From: Martin Dougiamas [mailto:martin@complex.curtin.edu.au] Sent: Tuesday, April 06, 1999 7:00 AM To: zope@zope.org Subject: Re: [Zope] Beginner DTML question: dereferencing a variable

Martin Dougiamas wrote:

...

I want to check if a folder of that name already exists under the current folder, so I can decide to create it or not.

Intuitively, I first tried:

<!--#if "theusername"--> <H3>FOLDER EXISTS</H3> <!--#else--> <H3>FOLDER DOES NOT EXIST</H3> <!--#/if-->

I seem to found a solution myself. This seems to work:

<!--#if "_.has_key(theusername)"--> <H3>FOLDER <!--#var "theusername"--> EXISTS</H3> <!--#else--> <H3>FOLDER <!--#var "theusername"--> DOES NOT EXIST</H3> <!--#/if-->

...as long as there's not a object with that name UP the hierarchy, I suppose.

Yes, acquisition could defeat you with this method. Try the objectIds method. From /lib/python/OFS/ObjectManager.py, def objectIds(self, spec=None): """Return a list of subobject ids. Returns a list of subobject ids of the current object. If 'spec' is specified, returns objects whose meta_type matches 'spec'. """ So you can use the sequence that objectIds returns in your DTML to find out if any subobjects if meta_type 'Folder' exist with the username your looking for. <!--#in "objectIds('Folder')--> <!--#if "id == theusername"--> Folder Exists <!--#/if--> <!--#/in--> You want to use a DTML Method to get the expected result. -Michel

If there's a cleaner way to do this I'd still like to know it.

Cheers! Martin

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