#204: added function user_can_moderate to be used in policies

app/policies/application_policy.rb

@@ -55,7 +55,11 @@ class ApplicationPolicy
     raise 'You must implement this method!'
   end
 
-  class Scope
+  def user_can_moderate?
+    user.is_admin? || user.is_moderator?
+  end
+
+  class Scope < ApplicationPolicy
     attr_reader :user, :scope
 
     def initialize(user, scope)