Use ActiveSupport::Concern for included modules

lib/the_moderator/model.rb

@@ -1,7 +1,14 @@
+require 'active_support/concern'
+
 module TheModerator
   module Model
-    def self.included(base)
-      base.has_many :moderations, as: :moderatable, dependent: :destroy
+    extend ActiveSupport::Concern
+
+    included do
+      has_many :moderations, as: :moderatable, dependent: :destroy
+    end
+
+    module ClassMethods
     end
 
     def moderate(*moderated_attributes)

lib/the_moderator/moderation_model.rb

@@ -1,12 +1,12 @@
+require 'active_support/concern'
+
 module TheModerator
   module ModerationModel
-    def self.included(base)
-      base.send :extend, ClassMethods
+    extend ActiveSupport::Concern
 
-      base.class_eval do
-        belongs_to :moderatable, polymorphic: true
-        serialize :data
-      end
+    included do
+      belongs_to :moderatable, polymorphic: true
+      serialize :data
     end
 
     module ClassMethods

the_moderator.gemspec

@@ -20,6 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency "activemodel", "~> 3.2.0"
   spec.add_dependency "activerecord", "~> 3.2.0"
+  spec.add_dependency "activesupport", "~> 3.2.0"
 
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"