[Zope3-dev] Re: tal:define="..." considered harmful?

Jean-Marc Orliaguet jmo at ita.chalmers.se
Mon Feb 13 07:34:29 EST 2006

Tonico Strasser wrote:

> Hi Jean-Marc!
> I agree that a view should not be able to modify the data model. But I 
> think tal:define is a must have :)
> For example: I need tal:define to define names for generic macros:
> <ul tal:define="list main_navigation">
>   <li metal:use-macro="macros/li_repeat"/>
> </ul>
> The 'li_repeat' macro expects the name 'list'.
> Tonico

That's exactly what I'm saying: if templates did not try to create their 
own data layer, the 'li_repeat' macro could get the data from the model 
(instead it has to rely on cross-template communication)

that's an anti-pattern which is the consequence of having introduced 
tal:define. :-)


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