join_table = options[:join_table_name] || Acl9::config[:default_join_table_name] || self.table_name_prefix + [undecorated_table_name(self.to_s), undecorated_table_name(role)].sort.join("_") + self.table_name_suffix

        has_and_belongs_to_many assoc.to_sym, :class_name => role, :join_table => join_table