Tweak RoutingError message to show option diffs, not just missing named route...

Tweak RoutingError message to show option diffs, not just missing named route significant keys. [Rick Olson]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4756 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

 *SVN*
 
+* Tweak RoutingError message to show option diffs, not just missing named route significant keys. [Rick Olson]
+
 * Invoke method_missing directly on hidden actions. Closes #3030. [Nicholas Seckar]
 
 * Require Tempfile explicitly for TestUploadedFile due to changes in class auto loading.  [Rick Olson]

actionpack/lib/action_controller/routing.rb

@@ -1007,8 +1007,8 @@ def generate(options, recall = {}, method=:generate)
         merged = recall.merge(options)
     
         if named_route
-          path = named_route.generate(options, merged, expire_on) 
-          raise RoutingError, "#{named_route_name}_url failed to generate from #{options.inspect}, missing: #{(named_route.significant_keys - options.keys).inspect}" if path.nil?
+          path = named_route.generate(options, merged, expire_on)
+          raise RoutingError, "#{named_route_name}_url failed to generate from #{options.inspect}, expected: #{named_route.requirements.inspect}, diff: #{named_route.requirements.diff(options).inspect}" if path.nil?
           return path
         else
           merged[:action] ||= 'index'