expires debate cache after a new flag

app/models/flag.rb

@@ -1,6 +1,6 @@
 class Flag < ActiveRecord::Base
   belongs_to :user
-  belongs_to :flaggable, polymorphic: true, counter_cache: true
+  belongs_to :flaggable, polymorphic: true, counter_cache: true, touch: true
 
   scope(:by_user_and_flaggable, lambda do |user, flaggable|
     where(user_id: user.id,

spec/factories.rb

@@ -77,6 +77,13 @@ FactoryGirl.define do
     trait :with_hot_score do
       before(:save) { |d| d.calculate_hot_score }
     end
+
+    trait :conflictive do
+      after :create do |debate|
+        Flag.flag(FactoryGirl.create(:user), debate)
+        4.times { create(:vote, votable: debate) }
+      end
+    end
   end
 
   factory :vote do
@@ -88,6 +95,11 @@ FactoryGirl.define do
     end
   end
 
+  factory :flag do
+    association :flaggable, factory: :debate
+    association :user, factory: :user
+  end
+
   factory :comment do
     association :commentable, factory: :debate
     user

spec/models/debate_spec.rb

@@ -281,6 +281,11 @@ describe Debate do
       .to change { debate.updated_at }
     end
 
+    it "should expire cache when it has a new flag", :focus do
+      expect { create(:flag, flaggable: debate) }
+      .to change { debate.reload.updated_at }
+    end
+
     it "should expire cache when it has a new tag" do
       expect { debate.update(tag_list: "new tag") }
       .to change { debate.updated_at }