display additional information, best practice

Hi all.
just a question about how to proceed.
when i've to display data direct from the model (the db) one in a page is simple.
what if i want to display aggregate data or some data that needs logic?
i've to do it in the view and add the object to the contex, or it's better to do a custom tag filter?

what if i've a list of objects and for each object i've to compute an aggregate data?
for example i've a list of cars and for each car i want to know how many models exists. if i do in the view, how can i attach the aggregate data (which is a query) to each car? is it better to do with a custom tag filter?

ciao.

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Stefano

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