Listing documents in two different controllers - refactor?

Hello,

if I have a document model (not RESTful) that belongs_to
document_category and a document controller with a list action, and I
want to list document per category
can I just pass the id of the category as the :id GET param of the
list action and filter the documents for this category?

I think that that this wouldn't be semantically good since one would
expect to get a list of all documents in the list action. The correct
way I think would be to get the filtered documents by category in the
document_categories/show/2. Also, document_categories/list would show
a list of document categories and not documents, right?

The point here is that I think that this is not dry since I have two
actions in two different controllers that lits documents - one all and
the other filtered. Of course I could have some kind of shared partial
for each document entry but the code in the controllers would still be
similar.

This smells refactoring somehow...

Any suggestions on best practices regarding this?

Thanks in advance!

Marcelo.