class Devise::Mapping

def default_used_helpers(options)
  singularizer = lambda { |s| s.to_s.singularize.to_sym }
  if options[:skip_helpers] == true
    @used_helpers = @used_routes
  elsif skip = options[:skip_helpers]
    @used_helpers = self.routes - Array(skip).map(&singularizer)
  else
    @used_helpers = self.routes
  end
end