From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2008-11-19T20:37:21+09:00
Subject: Re: Run a method in a Module

On Wed, Nov 19, 2008 at 12:19 PM, Mario Ruiz <mario@betware.com> wrote:
> In my case is a little bit more complicated since the modules I'll use
> are the output of another application and I cannot change the content.
> I'm doing something like:
>
> m1=Module1
> m1.instance_methods.each {|b|
>   # here I'm checking if the methods exist on Module2
>   # Also I'm running the method and getting the result in both modules
> }

One way I managed to do it, although I'm not sure it makes sense for
your case is:

irb(main):039:0> module Test
irb(main):040:1> def met
irb(main):041:2> puts "hi"
irb(main):042:2> end
irb(main):043:1> end
=> nil
irb(main):053:0> o = Object.new
irb(main):054:0> o.extend(Test)
=> #<Object:0xb7b543a4>
irb(main):057:0> Test.instance_method("met").bind(o).call
hi

That's because to call an instance method you need an object that is
the instance. So we build a "fake" object, extend it with the module,
bind the method to it and call it. Or you could just call the method
directly on the object:

irb(main):059:0> o.send("met")
hi

So for your case:

irb(main):060:0> o = Object.new
=> #<Object:0xb7c2c0ec>
irb(main):061:0> o.extend(Test)
=> #<Object:0xb7c2c0ec>
irb(main):062:0> Test.instance_methods.each {|m| o.send(m)}
hi

Of course this assumes (and I think that your use case too) that the
instance methods of the Module don't expect anything in the instance
binding they are called: i.e. they don't expect an 'each' method
defined or something like that.

Jesus.