Move reusable code to a module

lib/active_model/array_serializer.rb

@@ -1,3 +1,4 @@
+require 'active_model/serializable'
 require "active_support/core_ext/class/attribute"
 require 'active_support/dependencies'
 require 'active_support/descendants_tracker'
@@ -15,6 +16,8 @@ module ActiveModel
   class ArraySerializer
     extend ActiveSupport::DescendantsTracker
 
+    include ActiveModel::Serializable
+
     attr_reader :object, :options
 
     class_attribute :root
@@ -33,35 +36,8 @@ def initialize(object, options={})
       @object, @options = object, options
     end
 
-    def meta_key
-      @options[:meta_key].try(:to_sym) || :meta
-    end
-
-    def include_meta(hash)
-      hash[meta_key] = @options[:meta] if @options.has_key?(:meta)
-    end
-
-    def as_json(*args)
-      @options[:hash] = hash = {}
-      @options[:unique_values] = {}
-
-      if root = @options[:root]
-        hash.merge!(root => serializable_array)
-        include_meta hash
-        hash
-      else
-        serializable_array
-      end
-    end
-
-    def to_json(*args)
-      if perform_caching?
-        cache.fetch expand_cache_key([self.class.to_s.underscore, cache_key, 'to-json']) do
-          super
-        end
-      else
-        super
-      end
+    def serialize
+      serializable_array
     end
 
     def serializable_array

lib/active_model/serializable.rb

@@ -0,0 +1,34 @@
+module ActiveModel
+  module Serializable
+    def meta_key
+      options[:meta_key].try(:to_sym) || :meta
+    end
+
+    def include_meta(hash)
+      hash[meta_key] = options[:meta] if options.has_key?(:meta)
+    end
+
+    def as_json(*args)
+      options[:hash] = hash = {}
+      options[:unique_values] = {}
+
+      if root = options[:root]
+        hash.merge!(root => serialize)
+        include_meta hash
+        hash
+      else
+        serialize
+      end
+    end
+
+    def to_json(*args)
+      if perform_caching?
+        cache.fetch expand_cache_key([self.class.to_s.underscore, cache_key, 'to-json']) do
+          super
+        end
+      else
+        super
+      end
+    end
+  end
+end