Router accepts member routes on resource. [#4624 state:resolved]

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -622,13 +622,22 @@ def collection
         end
 
         def member
-          unless @scope[:scope_level] == :resources
-            raise ArgumentError, "can't use member outside resources scope"
+          unless [:resources, :resource].include?(@scope[:scope_level])
+            raise ArgumentError, "You can't use member action outside resources and resource scope."
           end
 
-          with_scope_level(:member) do
-            scope(':id', :name_prefix => parent_resource.member_name, :as => "") do
-              yield
+          case @scope[:scope_level]
+          when :resources
+            with_scope_level(:member) do
+              scope(':id', :name_prefix => parent_resource.member_name, :as => "") do
+                yield
+              end
+            end
+          when :resource
+            with_scope_level(:member) do
+              scope(':id', :as => "") do
+                yield
+              end
             end
           end
         end

actionpack/test/dispatch/routing_test.rb

@@ -28,6 +28,10 @@ def self.matches?(request)
         post :reset
 
         resource :info
+
+        member do
+          get :crush
+        end
       end
 
       match 'account/logout' => redirect("/logout"), :as => :logout_redirect
@@ -352,6 +356,15 @@ def test_session_info_nested_singleton_resource
     end
   end
 
+  def test_member_on_resource
+    with_test_routes do
+      get '/session/1/crush'
+      assert_equal 'sessions#crush', @response.body
+
+      assert_equal '/session/1/crush', crush_session_path(1)
+    end
+  end
+
   def test_redirect_modulo
     with_test_routes do
       get '/account/modulo/name'