Add shallow routes to the new router [Closes #3765]

actionpack/CHANGELOG

@@ -1,5 +1,15 @@
 *Rails 3.0.0 [beta 4/release candidate] (unreleased)*
 
+* Add shallow routes back to the new router [Diego Carrion]
+
+    resources :posts do
+      shallow do
+        resources :comments
+      end
+    end
+    
+    You can now use comment_path for /comments/1 instead of post_comment_path for /posts/1/comments/1.
+
 * Remove middleware laziness [José Valim]
 
 * Make session stores rely on request.cookie_jar and change set_session semantics to return the cookie value instead of a boolean. [José Valim]

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -350,6 +350,10 @@ module ActionDispatch
           scope(:constraints => constraints) { yield }
         end
 
+        def shallow
+          scope(:shallow => true) { yield }
+        end
+
         def defaults(defaults = {})
           scope(:defaults => defaults) { yield }
         end
@@ -374,12 +378,21 @@ module ActionDispatch
             @scope_options ||= private_methods.grep(/^merge_(.+)_scope$/) { $1.to_sym }
           end
 
+          def merge_shallow_scope(parent, child)
+            parent or child
+          end
+
           def merge_path_scope(parent, child)
-            Mapper.normalize_path("#{parent}/#{child}")
+            parent_path = (@scope[:shallow] and child.eql?(':id')) ? parent.split('/').last : parent
+            Mapper.normalize_path "#{parent_path}/#{child}"
           end
 
           def merge_name_prefix_scope(parent, child)
-            parent ? "#{parent}_#{child}" : child
+            if @scope[:shallow]
+              child
+            else
+              parent ? "#{parent}_#{child}" : child
+            end
           end
 
           def merge_module_scope(parent, child)
@@ -514,6 +527,10 @@ module ActionDispatch
             options["#{singular}_id".to_sym] = id_constraint if id_constraint?
             options
           end
+
+          def shallow?
+            options[:shallow]
+          end
         end
 
         class SingletonResource < Resource #:nodoc:
@@ -581,8 +598,12 @@ module ActionDispatch
 
           resource = Resource.new(resources.pop, options)
 
-          scope(:path => resource.path, :controller => resource.controller) do
+          scope(:path => resource.path, :controller => resource.controller, :shallow => resource.shallow?) do
             with_scope_level(:resources, resource) do
+              if @scope[:shallow] && @scope[:name_prefix]
+                @scope[:path] = "/#{@scope[:name_prefix].pluralize}/:#{@scope[:name_prefix]}_id/#{resource.path}"
+              end
+
               yield if block_given?
 
               with_scope_level(:collection) do
@@ -596,6 +617,8 @@ module ActionDispatch
               with_scope_level(:member) do
                 scope(':id') do
                   scope(resource.options) do
+                    @scope[:name_prefix] = nil if @scope[:shallow]
+
                     get    :show if resource.actions.include?(:show)
                     put    :update if resource.actions.include?(:update)
                     delete :destroy if resource.actions.include?(:destroy)

actionpack/test/dispatch/routing_test.rb

@@ -34,6 +34,33 @@ class TestRoutingMapper < ActionDispatch::IntegrationTest
         end
       end
 
+      resources :users do
+        shallow do
+          resources :photos do
+            resources :types do
+              member do
+                post :preview
+              end
+              collection do
+                delete :erase
+              end
+            end
+          end
+        end
+      end
+      
+      shallow do
+        resources :teams do
+          resources :players
+        end
+      
+        resources :countries do
+          resources :cities do
+            resources :places
+          end
+        end
+      end
+
       match 'account/logout' => redirect("/logout"), :as => :logout_redirect
       match 'account/login', :to => redirect("/login")
 
@@ -728,6 +755,18 @@ class TestRoutingMapper < ActionDispatch::IntegrationTest
     end
   end
 
+  def test_shallow_routes
+    with_test_routes do
+      assert_equal '/photos/4', photo_path(4)
+      assert_equal '/types/10/edit', edit_type_path(10) 
+      assert_equal '/types/5/preview', preview_type_path(5)
+      assert_equal '/photos/2/types', photo_types_path(2)
+      assert_equal '/cities/1/places', url_for(:controller => :places, :action => :index, :city_id => 1, :only_path => true)
+      assert_equal '/teams/new', url_for(:controller => :teams, :action => :new, :only_path => true)
+      assert_equal '/photos/11/types/erase', url_for(:controller => :types, :action => :erase, :photo_id => 11, :only_path => true)
+    end
+  end
+
   def test_update_project_person
     with_test_routes do
       get '/projects/1/people/2/update'