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Groups > comp.lang.ruby > #2921

Re: looking for an "inversion" pattern

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Fearless Fool wrote in post #992929:
> I'd like to create a method +foo+ that transforms:
>
>    my_obj.foo.some_method(*args)
>
> to
>
>   MyClass.some_method(my_obj, *args)

  class MyClass
    def self.some_method(obj, *args)
      puts "MyClass.some_method:"
      puts "obj: #{obj.inspect}"
      puts "args: #{args.inspect}"
    end
  end

  def define_foo(obj, clazz, method)
    obj.singleton_class.class_eval do
      define_method :foo do
        Class.new do
          define_method method do |*args|
            clazz.send(method, obj, *args)
          end
        end.new
      end
    end
  end

  my_obj = "my_obj thing"
  args = [1,2,3]
  define_foo(my_obj, MyClass, :some_method)
  my_obj.foo.some_method(*args)

  # =>
  # MyClass.some_method:
  # obj: "my_obj thing"
  # args: [1, 2, 3]

Returning facade or proxy objects like this can be an elegant solution 
to certain problems. It's rather high on the abstraction ladder, though, 
and without knowing the context I would wonder if more direct solutions 
are possible.

-- 
Posted via http://www.ruby-forum.com/.

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Thread

looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 00:16 -0500
  Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 01:27 -0500
    Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-15 04:24 -0500
      Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 10:40 -0500
        Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-16 15:29 +0200
  Re: looking for an "inversion" pattern Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-15 02:14 -0500
    Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 02:43 -0500
      Re: looking for an "inversion" pattern Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-15 08:44 -0500
    Re: looking for an "inversion" pattern 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-16 13:20 -0500
      Re: looking for an "inversion" pattern 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-16 13:43 -0500
  Re: looking for an "inversion" pattern Jesús Gabriel y Galán <jgabrielygalan@gmail.com> - 2011-04-15 02:45 -0500
  Re: looking for an "inversion" pattern Brian Candler <b.candler@pobox.com> - 2011-04-16 16:14 -0500
    Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-16 23:40 +0200

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