Hello all- I am implementing a database of items that link to vendors, manufacturers, categories, and so on. Since there could be thousands of components within the database, I am now starting the task of building up the logic for selection filters. I think I would like to store the user''s selection in the session, but am wondering what should end up being stored. For now, I''ll assume i''m always searching within one particular group (i.e., I''m looking for items, not any combination of items, vendors, categories). But the filters could specify, say -- include the following categories, but don''t include these manufacturers. Should it be layers of hashes with selection information which is then translated into SQL just before the ''find'' statement? Or should I build each "WHERE xxx" statement each time they add another selection filter and concatenate them? Can you point me to any good apps that lay out this sort of selection process well? Thanks much! Jake -- Posted via http://www.ruby-forum.com/.