Make namespace work with options[:to] [#4351 state:committed]

Signed-off-by: José Valim <jose.valim@gmail.com>

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -55,6 +55,14 @@ def extract_path_and_options(args)
               path = args.first
             end
 
+            if @scope[:module] && options[:to]
+              if options[:to].to_s.include?("#")
+                options[:to] = "#{@scope[:module]}/#{options[:to]}"
+              elsif @scope[:controller].nil?
+                options[:to] = "#{@scope[:module]}##{options[:to]}"
+              end
+            end
+
             path = normalize_path(path)
 
             if using_match_shorthand?(path, options)

actionpack/test/dispatch/routing_test.rb

@@ -140,7 +140,7 @@ def self.matches?(request)
 
       namespace :account do
         match 'shorthand'
-        match 'description', :to => "account#description", :as => "description"
+        match 'description', :to => "description", :as => "description"
         resource :subscription, :credit, :credit_card
 
         root :to => "account#index"
@@ -864,7 +864,7 @@ def test_namespaced_roots
     with_test_routes do
       assert_equal '/account', account_root_path
       get '/account'
-      assert_equal 'account#index', @response.body
+      assert_equal 'account/account#index', @response.body
     end
   end