chaining methods on nil (null object pattren)

null_object_chaining.rb

# null object pattern Objective-C style (togglable)
# more elegant: https://gist.github.com/3792804

def null_chain
  unless NilClass.instance_variable_defined?(:@null_chain)
    NilClass.class_eval do
      alias_method :nc_mm_orig, :method_missing

      def method_missing(name, *args, &block)
        if self.class.null_chain?
          nil
        else
          nc_mm_orig(name, *args, &block)
        end
      end

      def self.null_chain?
        @null_chain
      end
    end
  end
  NilClass.instance_variable_set(:@null_chain, true)
  yield.tap do
    NilClass.instance_variable_set(:@null_chain, false)
  end
end

null_chain do
  @abrakadabra.whatever.work
  @abrakadabra.whatever.work
end

begin
  @abrakadabra.whatever.work
rescue
  puts "it works"
end