build

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 171
        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