From: James Coglan <jcoglan@...>
Date: 2008-09-10T07:30:01+09:00
Subject: Re: How to access a method in the parent class

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2008/9/9 I=F1aki Baz Castillo <ibc@aliax.net>

> Hi, I'll explain my problem with an example code:
>
> -----------------------
> module M
>        def hello
>                puts "hello !!!"
>                B.new
>        end
>
>        class B
>                def initialize
>                        puts "B instance initialized !!!"
>                        bye()   <--- ERROR !!!!
>                end
>        end
> end
>
>
> class A
>        include M
>
>        def bye
>                puts "bye !!!"
>        end
> end
>
>
> a =3D A.new
> a.hello
> -----------------------
>
>
> I want the following behaviour:
>
> irb> a.hello
> =3D> "hello !!!"
> =3D>  "B instance initialized !!!"
> =3D> "bye !!!"
>
>
> But the last bye() gives an error since, of course, "bye" is not defined =
in
> B
> class, but in A class.
>
> I know that if it would be:
> ------------------
> module M
>
>        def hello
>                puts "hello !!!"
>                bye
>        end
>
> end
>
> irb> a.hellp
> ------------------
> This works since "bye()" calls the "bye" method in class A. But this is n=
ot
> my
> case.
>
> How could I call A#bye method from M::B class?
>
> Thanks a lot.
>


To call a method from another class in the context of an instance of B, put
this inside M::B#initialize:

A.instance_method(:bye).bind(self).call()

Hard to tell from this code, seeing as how it does nothing apparently
useful, but if you find yourself doing this it may be a sign that you need
to rethink your design.

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