search for: client_casemgr_id

I have been working on this for 3 days and haven''t been able to solve it. I have 2 tables... clients belongs_to: case_managers case_managers has_many: clients When entering new clients, I need to have some type of select box that allows me to pick the case_manager (by name) so that the ''id'' field from the case_manager table is inserted into clients.case_manager_id