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Cheetah templates overriding

Cheetah is a very good templating language, especially because it's the one (correct me if i'm wrong) to apply the Object-Oriented model to Documents. It can seem a bit weird at the beginning but when you get used to it, you can't live without it :-)

So, i was looking for a good way to overload template parts without pain, here is how (couldn't find the trick on Cheetah doc):

  1. Assume you have a template Package/Page.tmpl like that:

    #def footer
      This is my foot !
    #end def
    
  2. Create a Page_custom.tmpl template:

    #extends Package.Page
    
    #def footer
      $Page.footer($self) Where's my mind ? (dixit the Pixies)
    #end def
    
  3. You need to put a self variable in the template's searchList which is the Cheetah template instance itself :-)

I don't think that trick will work if you don't compile your templates to Python code.

by Philippe Normand on Tue Mar 22 09:01:25 2005 (Viewed: 25802 / 2 comments )
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#.   deelan on Fri Aug 12 13:27:27 2005

"I don't think that trick will work if you don't compile your templates to Python code."

Correct, actually you have to precompile the base class.

In Subway[1] we managed to automatically compile the whole template hierarchy upon request. Builiding web site using Cheetah and his #extends directive is great. As you have written you can write some default markup into parent template #blockS and then override only when you really need to. No more ugly includes :)

For example, base site.html:

http://subway.python-hosting.com/file/sandbox/bikini/view/site.html

and one view which overrides both "content" and "nav" #blocks:

http://subway.python-hosting.com/file/sandbox/bikini/view/entry/show.html

-- deelan

[1] http://subway.python-hosting.com/

#.   phil on Fri Aug 12 14:16:57 2005

Good point Deelan ;)

Actually the same trick is used by the framework behind this blog, but with #defS instead of #blockS

See the basic template:

http://svn.pythonfr.org/public/alinea/Alinea/templates/SitePage.tmpl

And one custom template (the #extends is added a posteriori):

http://svn.pythonfr.org/public/alinea/Alinea/designs/redFlower/SitePage_c.tmpl

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