to_constant_name

# File activesupport/lib/active_support/dependencies.rb, line 570
    def to_constant_name(desc) #:nodoc:
      name = case desc
        when String then desc.starts_with?('::') ? desc[2..-1] : desc
        when Symbol then desc.to_s
        when Module
          raise ArgumentError, "Anonymous modules have no name to be referenced by" if desc.name.blank?
          desc.name
        else raise TypeError, "Not a valid constant descriptor: #{desc.inspect}"
      end
    end