path: root/activesupport/lib/active_support/core_ext/hash/deep_dup.rb

class Hash
  # Returns a deep copy of hash.
  def deep_dup
    duplicate = self.dup
    duplicate.each_pair do |k,v|
      tv = duplicate[k]
      duplicate[k] = tv.is_a?(Hash) && v.is_a?(Hash) ? tv.deep_dup : v
    end
    duplicate
  end
end