From: Logan Capaldo <logancapaldo@...>
Date: 2006-12-05T09:13:06+09:00
Subject: Re: How do I catch a missing method on a passed block?

On Tue, Dec 05, 2006 at 08:04:33AM +0900, J2M wrote:
> I would like to invoke method_missing on baz in this code;
> 
> x = Foo.new
> x.bar { baz }
> 
> I tried the following, and although the method is added to the proc
> objects singleton class, the method_missing method never gets called.
> Is there any way to achieve this? My current code (that doesn't work)
> is below;
> 
You'd want to define the method_missing
<--- here
x.bar { baz }

Obviously that's not always practical, so what you need to do is change
self. That can be acheived by using #instance_eval. This has
disadvantages, obviously, but that's how to do it if you want to do it.

Or you can pass a parameter into the block:
x.bar { |q| q.baz } 
> class Foo
> 
>   def bar(*values, &block)
> 
>     if block_given?
> 
>       class << block
>         def method_missing(m, *args, &block)
>           puts "missing #{m}"
>         end
>       end  
> 
>       block.call
> 
>     end  
>   end
> end
>