From: "Sandor Szücs" <sandor.szuecs@...>
Date: 2013-01-05T19:45:58+09:00
Subject: Re: respond_to_missing?

On 1/4/13 3:14 AM, Intransition wrote:
> Can anyone explain `#respond_to_missing?`.
> 

The answer can be found at [1].

irb:0> class Bar
irb:1>     def method_missing name, *args
irb:2>       p args
irb:2>     end
irb:1>
irb:1*     def respond_to? name, include_private = false
irb:2>       true
irb:2>     end
irb:1> end
=> nil
irb:0> Bar.new.respond_to? :does_not_exist
=> true
irb:0> Bar.new.method :does_not_exist
NameError: undefined method `does_not_exist' for class `Bar'
        from (irb):112:in `method'
        from (irb):112
        from /Users/sz/.rvm/rubies/ruby-1.9.3-p362/bin/irb:16:in `<main>'


irb:0> class Foo
irb:1>     def respond_to? *args; super; end
irb:1>
irb:1*     def respond_to_missing? *args
irb:2>       true
irb:2>     end
irb:1> end
=> nil
irb:0>  Foo.new.respond_to? :does_not_exist
=> true
irb:0>  Foo.new.method :does_not_exist
=> #<Method: Foo#does_not_exist>


[1]
http://stackoverflow.com/questions/13793060/respond-to-vs-respond-to-missing
-- 
All the best, Sandor Szücs