search for: mandant_id

..._by is actually the same like Find(:all), however Find_all_by is much shorter and less complicated than the syntax of Find(:all) -So in my CONTROLLER it says @files = find(:all) however I don''t want to see all files displayed in my selection box, because I only want to see the foles whose mandant_id is the same like the mandant_id in invoice. So i decided to change the @files = find(:all) into => @files = File.find_all_by_mandant_id(Invoice.mandant_id) But this doesn´t work so does any one has an inspiration to get it working?? If so please help me!! thnx a lot!! =D Valli