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Type:
Module

SingleForwardable can be used to setup delegation at the object level as well.

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printer = String.new
printer.extend SingleForwardable        # prepare object for delegation
printer.def_delegator "STDOUT", "puts"  # add delegation for STDOUT.puts()
printer.puts "Howdy!"

Also, SingleForwardable can be used to set up delegation for a Class or Module.

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class Implementation
  def self.service
    puts "serviced!"
  end
end
 
module Facade
  extend SingleForwardable
  def_delegator :Implementation, :service
end
 
Facade.service #=> serviced!

If you want to use both Forwardable and SingleForwardable, you can use methods def_instance_delegator and #def_single_delegator, etc.

def_single_delegator
  • References/Ruby on Rails/Ruby/Classes/SingleForwardable

def_single_delegator(accessor, method, new_name=method) Instance Public methods Defines

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single_delegate
  • References/Ruby on Rails/Ruby/Classes/SingleForwardable

delegate method => accessordelegate [method, method, ...] => accessor Instance Public methods

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delegate
  • References/Ruby on Rails/Ruby/Classes/SingleForwardable

delegate(hash) Instance Public methods Alias for:

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def_delegator
  • References/Ruby on Rails/Ruby/Classes/SingleForwardable

def_delegator(accessor, method, ali = method) Instance Public methods Alias

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def_single_delegators
  • References/Ruby on Rails/Ruby/Classes/SingleForwardable

def_single_delegators(accessor, *methods) Instance Public methods Shortcut for

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def_delegators
  • References/Ruby on Rails/Ruby/Classes/SingleForwardable

def_delegators(accessor, *methods) Instance Public methods Alias for:

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