foreign_key to foreign_key mapping

tables are created on for examples to show foreign_key to foreign_key

one table id ss_id name

second table id false_id name

belongs_to :falseinformation, :class_name => "One", :foreign_key => "false_id"

now this would map false_id -----> one_id but i want it to map like this false_id -------> ss_id

can this be done?