to_constant_name

# File activesupport/lib/active_support/dependencies.rb, line 676
    def to_constant_name(desc) #:nodoc:
      case desc
        when String then desc.sub(/^::/, '')
        when Symbol then desc.to_s
        when Module
          desc.name ||
            raise(ArgumentError, "Anonymous modules have no name to be referenced by")
        else raise TypeError, "Not a valid constant descriptor: #{desc.inspect}"
      end
    end