per request project rules caching

Gemfile

@@ -174,6 +174,7 @@ gem "font-awesome-rails", '~> 3.2'
 gem "gitlab_emoji", "~> 0.0.1.1"
 gem "gon", '~> 5.0.0'
 gem 'nprogress-rails'
+gem 'request_store'
 
 group :development do
   gem "annotate", "~> 2.6.0.beta2"

Gemfile.lock

@@ -412,6 +412,7 @@ GEM
     redis-store (1.1.4)
       redis (>= 2.2)
     ref (1.0.5)
+    request_store (1.0.5)
     require_all (1.3.2)
     rest-client (1.6.7)
       mime-types (>= 1.16)
@@ -650,6 +651,7 @@ DEPENDENCIES
   rb-inotify
   redcarpet (~> 2.2.2)
   redis-rails
+  request_store
   rspec-rails
   sanitize (~> 2.0)
   sass-rails (~> 4.0.2)

app/models/ability.rb

@@ -67,7 +67,8 @@ class Ability
 
     def project_abilities(user, project)
       rules = []
-
+      key = "/user/#{user.id}/project/#{project.id}"
+      RequestStore.store[key] ||= begin
         team = project.team
 
         # Rules based on role in project
@@ -102,6 +103,7 @@ class Ability
 
         rules
       end
+    end
 
     def public_project_rules
       project_guest_rules + [