build

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 189
          def self.build(action, type)
            prefix = action ? "#{action}_" : ""
            suffix = type
            if action.to_s == "new"
              HelperMethodBuilder.singular prefix, suffix
            else
              HelperMethodBuilder.plural prefix, suffix
            end
          end