Uli,
there is no huge different between interacting with the model layer  
in a filter or in a action.

Have a look at this filter for an example:

http://trac.symfony-project.com/browser/plugins/sfGuardPlugin/lib/ 
sfGuardBasicSecurityFilter.class.php


As you want to do some performance tweaks i would suggest not to  
hydrate your criteria result and to do some raw statement querying in  
stead.

For Propel 1.2 see:

http://www.symfony-project.com/book/1_0/08-Inside-the-Model- 
Layer#Using%20Raw%20SQL%20Queries


- Frank



Am 12.11.2007 um 22:37 schrieb Uli Nitsche:

> My problem: I do not know how I can access
> a variable of my model class in the filter context.


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