-----Original Message----- From: Chris Walter <walter@budoe.bu.edu> To: Kevin Dangoor <kid@kendermedia.com> Cc: zope@zope.org <zope@zope.org> Date: Monday, August 23, 1999 3:25 PM Subject: Re: [Zope] calling product ZClass add method

That's what I get for not blindly following instructions! I thought since in my first little test case I was only adding one instance it was harmless to re-direct the output. It looks like I was wrong. I went ahead and modified multiRes_add and it worked great. Now I can loop through a tinytable and produce multiRes objects just like I wanted to.

Cool.

BTW as far as I am concerned you are a genius for figuring out the line:

<dtml-with "manage_addProduct['YourProduct']">

by looking at the HTML source. I don't really know python yet. What is the meaning of the "[]" as opposed to the "()"? Array instead of function?

Essentially, yes. Python lets you implement your own functions that figure out how to deal with [] or () for a given class. For manage_addProduct, they essentially made it a dictionary of Products. I admit that I did have to *guess* that /manage_addProduct/YourProduct/ZClass_factory from the HTML source maps to manage_addProduct['YourProduct'].ZClass_factory, instead of manage_addProduct.YourProduct.ZClass_factory. Though, when I think about it now, it makes a bit of sense because YourProduct is not actually part of manage_addProduct. manage_addProduct simply "points" to the product.

In the HOWTO it might be nice to point out that _ is a special variable that contains the namespace and people should look in the DTML users's guide for more info.

Good idea.

I thought about this but decided against it. multiRes is a ZClass for displaying multiple resolutions of images stored on a disk. It can display a small image as a link to a larger image. I thought it was useful enough outside of photoCD directories that I might make it available to others sometime who might have other uses for it.

This makes sense. Kevin