recursive_stringify_keys! on Hash

gistfile1.rb

class Hash
  def recursive_stringify_keys!
    self.each do |key, value|
      string_key = key.to_s
      unless key.is_a?(String)
        self[string_key] = self[key]
        self.delete(key)
        if self[string_key].is_a?(Hash)
          self[string_key] = self[key.to_s].recursive_stringify_keys!
        elsif self[string_key].is_a?(Array) #this can be extended to any collection, reverted back because String had :each !
          self[string_key] = self[string_key].collect! { |val| val.respond_to?(:recursive_stringify_keys!) ? val.recursive_stringify_keys! : val }
        end
      end
    end
    self
  end
end