Ruby Deep Freeze for Hash and Array classes

deep_freeze.rb

# Adds deep_freeze! method to Hash
Hash.class_eval do
  def deep_freeze!
    each_value{|val| val.deep_freeze! if val.respond_to?(:deep_freeze!) }
    freeze
  end
end

# Adds deep_freeze! method to Array
Array.class_eval do
  def deep_freeze!
    each{|val| val.deep_freeze! if val.respond_to?(:deep_freeze!) }
    freeze
  end
end

#We don't want to accidentally freeze global objects like Classes, so only white-listing
[String, Range, ActiveRecord::Base, Set].each do |cls|
  cls.send(:alias_method, :deep_freeze!, :freeze)
end