path_for_action

# File actionpack/lib/action_dispatch/routing/mapper.rb, line 1430
          def path_for_action(action, path) #:nodoc:
            prefix = shallow_scoping? ?
              "#{@scope[:shallow_path]}/#{parent_resource.path}/:id" : @scope[:path]

            path = if canonical_action?(action, path.blank?)
              prefix.to_s
            else
              "#{prefix}/#{action_path(action, path)}"
            end
          end