From: Florian Odronitz <odo@...>
Date: 2010-07-30T17:53:27+09:00
Subject: Re: Accessing object in rescue block

Thanks for your thoughts, I figured it out.

I was coming from this Article:
http://rbjl.net/26-the-28-bytes-of-ruby-joy

The author suggests to let the method_missing of Nil always return nil 
so you could do things like:
some_object.this_is_null.do_something_more
would return nil and not raise on the undefined method 
'do_something_more' on nil.
I thought such an approach was to intrusive and it would be better to do 
something like:

ignore_nil{some_object.this_is_null.do_something_more}

My current implementation looks like this:

class NoMethodErrorInNil < NoMethodError; end

class NilClass
  def method_missing(method_name, *args)
    raise NoMethodErrorInNil, "undefined method `#{method_name}' for 
nil:NilClass"
  end
end

class Object
  def ignore_nil(return_value = nil, &block)
    begin
      yield
    rescue NoMethodErrorInNil => e
      return return_value
    end
  end
end
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