SCRUM#364: Fix review average not updating after delete

Gemfile.lock

@@ -356,7 +356,7 @@ GEM
       activemodel (= 5.0.0.1)
       activerecord (= 5.0.0.1)
       activesupport (= 5.0.0.1)
-      bundler (>= 1.3.0)
+      bundler (>= 1.3.0, < 2.0)
       railties (= 5.0.0.1)
       sprockets-rails (>= 2.0.0)
     rails-dom-testing (2.0.3)

app/models/review.rb

@@ -40,6 +40,7 @@ class Review < ApplicationRecord
   include Complainable
 
   after_save :calculate_review_rate
+  after_destroy :calculate_review_rate
 
   belongs_to :reviewable, polymorphic: true
   belongs_to :user
@@ -88,7 +89,7 @@ class Review < ApplicationRecord
   private
 
   def calculate_review_rate
-    ReviewAverageCalculatorWorker.perform_async(reviewable.id, reviewable.class.name)
+    ReviewAverageCalculatorWorker.perform_in(1.minutes, reviewable.id, reviewable.class.name)
   end
 
 end