constantize

# File activesupport/lib/active_support/inflector.rb, line 156
  def constantize(camel_cased_word)
    raise NameError, "#{camel_cased_word.inspect} is not a valid constant name!" unless
      /^(::)?([A-Z]\w*)(::[A-Z]\w*)*$/ =~ camel_cased_word
    
    camel_cased_word = "::#{camel_cased_word}" unless $1
    Object.module_eval(camel_cased_word, __FILE__, __LINE__)
  end