remove six, and use a Set instead

Gemfile

@@ -97,9 +97,6 @@ gem 'fog-rackspace', '~> 0.1.1'
 # for aws storage
 gem 'unf', '~> 0.1.4'
-# Authorization
-gem 'six', '~> 0.2.0'
-
 # Seed data
 gem 'seed-fu', '~> 2.3.5'

Gemfile.lock

@@ -683,7 +683,6 @@ GEM
       rack (~> 1.5)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    six (0.2.0)
     slack-notifier (1.2.1)
     slop (3.6.0)
     spinach (0.8.10)
@@ -954,7 +953,6 @@ DEPENDENCIES
   sidekiq-cron (~> 0.4.0)
   simplecov (= 0.12.0)
   sinatra (~> 1.4.4)
-  six (~> 0.2.0)
   slack-notifier (~> 1.2.0)
   spinach-rails (~> 0.2.1)
   spinach-rerun-reporter (~> 0.0.2)

app/models/ability.rb

 class Ability
   class << self
+
+    end
+
+    def allowed?(user, action, subject)
+      allowed(user, subject).include?(action)
+    end
+
     def allowed(user, subject)
-      return anonymous_abilities(user, subject) if user.nil?
+      return uncached_allowed(user, subject) unless RequestStore.active?
+
+      user_key = user ? user.id : 'anonymous'
+      subject_key = subject ? "#{subject.class.name}/#{subject.id}" : 'global'
+      key = "/ability/#{user_key}/#{subject_key}"
+      RequestStore[key] ||= Set.new(uncached_allowed(user, subject)).freeze
+    end
+
+    def uncached_allowed(user, subject)
+      return anonymous_abilities(subject) if user.nil?
       return [] unless user.is_a?(User)
       return [] if user.blocked?
@@ -586,11 +602,8 @@ class Ability
     end
     def abilities
-      @abilities ||= begin
-        abilities = Six.new
-        abilities << self
-        abilities
-      end
+      warn 'Ability.abilities is deprecated, use Ability.allowed?(user, action, subject) instead'
+      self
     end
     private

lib/api/helpers.rb

@@ -409,11 +409,7 @@ module API
     end
     def abilities
-      @abilities ||= begin
-                       abilities = Six.new
-                       abilities << Ability
-                       abilities
-                     end
+      Ability
     end
     def secret_token

spec/models/members/project_member_spec.rb

@@ -71,8 +71,7 @@ describe ProjectMember, models: true do
   describe :import_team do
     before do
-      @abilities = Six.new
-      @abilities << Ability
+      @abilities = Ability
       @project_1 = create :project
       @project_2 = create :project

spec/models/note_spec.rb

@@ -85,8 +85,7 @@ describe Note, models: true do
       @u1 = create(:user)
       @u2 = create(:user)
       @u3 = create(:user)
-      @abilities = Six.new
-      @abilities << Ability
+      @abilities = Ability
     end
     describe 'read' do