On Thu, 2005-01-27 at 10:43 -0500, Asad Habib wrote:

I have a Z SQL method that contains a simple SELECT statement and takes no arguments. When I call this Z SQL method from a DTML document/method I use the following: <dtml-in retrieve_names_sql></dtml-in>

This works just fine.

However, when I place the Z SQL method inside a Folder called selects and then use the following, I get an error: <dtml-in "selects.retrieve_names_sql"></dtml-in>

The error I get is the following: KeyError: 0

On the other hand, when I use the following I do not get an error: <dtml-in "selects.retrieve_names_sql()"></dtml-in> I understand the difference between the 2 <dtml-in> statements but why isit that I have to explicitly show that retrieve_names_sql does not take any arguments in the latter case and not the former. The id of this Z SQL method/Zope object is retrieve_names_sql and it seems to me that this should be recognized within the object hierarchy. Any help/input would be greatly appreciated. Thank you.

<dtml-XXX blah> is equivalent to <dtml-XXX name="blah"> and does some magic tricks to find out if the object identified by name is callable, and if so how, and then it is used as ordinary attribute or called via () or with some default arguments (REQUEST, Namespace etc) <dtml-XXX "blah"> and <dtml-XXX expr="blah"> are equivalent also and expect the contents beeing a valid python expression, that is, you cant simply use . and - in names (since they have a meaning in python expressions) and you have to write the call explicit if you have a method or function. Otoh, this offers you the way to call the function with arguments. Regards Tino