From: Josh Cheek <josh.cheek@...>
Date: 2010-05-18T09:01:20+09:00
Subject: Re: Dynamically adding methods to a class

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On Mon, May 17, 2010 at 6:25 PM, Sam Uel <cannedlobstah@gmail.com> wrote:

> Hi!
>
> I'm trying to add a method dynamically to a class by opening an existing
> class, and it actually works. What I don't understand is why it doesn't
> show up when I use the "methods" method on it afterwards.
>
> What I do is something like this:
> Code:
>
> def method_missing name, *args
>
>   Array.class_eval "def #{name} *args; #{str}; end"
>
> end
>
> Afterwards I can call that method on every object of this class (new or
> otherwise). However, it doesn't show up in Array.methods.
>
> The Array.methods.length is the same both before and after that line is
> executed and adds the method. However, if I do a self.methods.length the
> number of methods has increased.
>
> My question is therefore this: how can I add a method to a class (e.g.
> Array) and have it show up when I do a <class>.methods on it?
>
>
> Thanks in advance for any help!
> --
> Posted via http://www.ruby-forum.com/.
>
>
It is not being defined for the Array class, but rather for instances of the
Array class. Try:
Array.instance_methods

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