callback_meta.rb

          def before_password_verification method_sym, options={}, &block
            puts "Called before_password_verification: #{method_sym}, #{options.inspect}"
            if block_given?
              before :before_password_verification, method_sym, &block
            else
              before :before_password_verification do
                if options[:if]     
                  return false unless send(options[:if])
                end
                
                if options[:unless] 
                  return false if send(options[:unless])
                end
                
                send method_sym
              end
            end
          end