Rails - Oct 2006 - acts_as_taggable and user_id find_by...

@publications = if tag_name = params[:id]
       Document.find_tagged_with(tag_name)
     else
       Document.find_all_by_employee_id(session[:user_id])
     end

if I am logged in and
if my url is .../document/index/wibble
i get all items tagged with wibble (with or without my user_id

if my url is .../docucment/
i get all items with my user_id.

i can''t seem to find out how to get tag_name and user_id.
so I see documents i have tagged with wibble.

i''ve tried the find_by_tagged_with_and_user_id(tag_name,
session[:user_id])
i get this error
undefined method `find_by_tagged_with_and_user_id'' for Document:Class

i''m not sure what to try next...
any suggestions?
thanks,
john

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