to_constant_name

# File activesupport/lib/active_support/dependencies.rb, line 409
  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