Null Object for Ruby

null.gemspec

Gem::Specification.new do |s|
  s.name        = 'null'
  s.version     = '0.0.1'
  s.platform    = Gem::Platform::RUBY
  s.author      = 'Gregory Igelmund'
  s.email       = '[email protected]'
  s.summary     = 'Dynamic Null Object'
  s.description = 'Responds on all methods with itself. Credits to @flori. NullObject is taken from Tins: https://github.com/flori/tins'
 
  s.files         = ['null.rb']
  # TBD => s.test_file     = '' 
  s.require_path  = '.'
 
  s.add_development_dependency('rspec', ["~> 2.0"])
end

null.rb

module Microgem
  # Implementation of the null object pattern in Ruby.
  class NullObject
    def method_missing(*)
      self
    end

    def const_missing(*)
      self
    end

    def to_s
      ''
    end

    def to_str
      nil
    end

    def to_f
      0.0
    end

    def to_i
      0
    end

    def to_int
      nil
    end

    def to_a
      []
    end

    def to_ary
      nil
    end

    def inspect
      'NULL'
    end

    def nil?
      true
    end

    def blank?
      true
    end

    def as_json(*)
    end

    def to_json(*)
      'null'
    end
  end
end