[Zope] Newbie: Missing a Variable (TAL/METAL Question)

David H bluepaul at earthlink.net
Wed Jul 26 18:28:45 EDT 2006

beno - wrote:

> Hi;
> I have the following block of code:
> <table tal:define="objects here/objectValues;
>                    sort_on python:(('title', 'nocase', 'asc'),
>                                    ('bobobase_modification_time', 
> 'cmp', 'desc'));
>                    sorted_objects python:sequence.sort(objects, sort_on);
>                    start python:getattr(request, 'start', 0);
>                    batch 
> python:modules['ZTUtils'].Batch(sorted_objects, size=10, start=start);
>                    previous python:batch.previous;
>                    next python:batch.next">
>   <tr tal:repeat="item batch">
>     <td tal:content="item/title">title</td>
>     <td tal:content="item/bobobase_modification_time">
>       modification date</td>  
>     <td tal:content="here/author">author</td>
>     <td tal:content="here/content">content</td>
>   </tr>
> </table>
> that works fine. But I'd like to call the following in that table:
> <td><tal:content 
> metal:use-macro="here/XXX/macros/author"></tal:content></td>
> where "XXX" is the "item" that changes each time a new item from the 
> batch is called. In other words, there is a folder with a "batch" of 
> files, and each file is an "item". So, since the files' titles are 
> simply sequential numbers, it would look something like this:
> <td><tal:content 
> metal:use-macro="here/1/macros/author"></tal:content></td>
> <td><tal:content 
> metal:use-macro="here/2/macros/author"></tal:content></td>
> <td><tal:content 
> metal:use-macro="here/3/macros/author"></tal:content></td>
> ...

How do I do that? Even better, is it possible to just open up each file 
and read its contents??

> Thanks,
> Ben
> ------------------------------------------------------------------------

First this is wrong:

<td><tal:content ...

If should be
<td tal:content ...

But that may be wrong in the context you've given. 

Since "do it in python" has been a theme lately, you can also return a 
macro from a python script like so:

Where there is an author might be a parameter.
#some python script
      return container.YourMacroFolder.someMacro[ author ]

And in your ZPT: (where result.author is just a stub for whatever your 

<td><span  metal:use-macro="python: 
context.youPythonScript(result.author)">macro goes here</span></td>

I suggest *always* doing stuff in python when things are not clear.  
Then code back into your Page Templates, if desired


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