Merge pull request #5242 from rails/opt_routes

Optimize routes generation in simple cases.

If you pass to the route helper the same amount of arguments
as the required segments, route generation will be optimized
as a string interpolation. After this commit, `post_path(post)`
is about 6.5 times faster, `post_url(post)` is about 5 times.

1 files changed, 3 insertions, 1 deletions

diff --git a/actionpack/lib/action_dispatch/http/url.rb b/actionpack/lib/action_dispatch/http/url.rb
index 80ffbe575b..f9dae5dad7 100644
--- a/actionpack/lib/action_dispatch/http/url.rb
+++ b/actionpack/lib/action_dispatch/http/url.rb
@@ -40,7 +40,9 @@ module ActionDispatch
             rewritten_url << ":#{options.delete(:port)}" if options[:port]
           end
 
-          path = options.delete(:path) || ''
+          path = ""
+          path << options.delete(:script_name).to_s.chomp("/")
+          path << options.delete(:path).to_s
 
           params = options[:params] || {}
           params.reject! {|k,v| v.to_param.nil? }