class Devise::Mapping

def default_used_route(options)
  singularizer = lambda { |s| s.to_s.singularize.to_sym }
  if options.has_key?(:only)
    @used_routes = self.routes & Array(options[:only]).map(&singularizer)
  elsif options[:skip] == :all
    @used_routes = []
  else
    @used_routes = self.routes - Array(options[:skip]).map(&singularizer)
  end
end