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diff --git a/vendor/rails/activerecord/lib/active_record/serialization.rb b/vendor/rails/activerecord/lib/active_record/serialization.rb
new file mode 100644
index 0000000..870b4b2
--- /dev/null
+++ b/vendor/rails/activerecord/lib/active_record/serialization.rb
@@ -0,0 +1,100 @@
+require 'active_support/json'
+
+module ActiveRecord #:nodoc:
+  module Serialization
+    class Serializer #:nodoc:
+      attr_reader :options
+
+      def initialize(record, options = {})
+        @record, @options = record, options.dup
+      end
+
+      # To replicate the behavior in ActiveRecord#attributes,
+      # <tt>:except</tt> takes precedence over <tt>:only</tt>.  If <tt>:only</tt> is not set
+      # for a N level model but is set for the N+1 level models,
+      # then because <tt>:except</tt> is set to a default value, the second
+      # level model can have both <tt>:except</tt> and <tt>:only</tt> set.  So if
+      # <tt>:only</tt> is set, always delete <tt>:except</tt>.
+      def serializable_attribute_names
+        attribute_names = @record.attribute_names
+
+        if options[:only]
+          options.delete(:except)
+          attribute_names = attribute_names & Array(options[:only]).collect { |n| n.to_s }
+        else
+          options[:except] = Array(options[:except]) | Array(@record.class.inheritance_column)
+          attribute_names = attribute_names - options[:except].collect { |n| n.to_s }
+        end
+
+        attribute_names
+      end
+
+      def serializable_method_names
+        Array(options[:methods]).inject([]) do |method_attributes, name|
+          method_attributes << name if @record.respond_to?(name.to_s)
+          method_attributes
+        end
+      end
+
+      def serializable_names
+        serializable_attribute_names + serializable_method_names
+      end
+
+      # Add associations specified via the <tt>:includes</tt> option.
+      # Expects a block that takes as arguments:
+      #   +association+ - name of the association
+      #   +records+     - the association record(s) to be serialized
+      #   +opts+        - options for the association records
+      def add_includes(&block)
+        if include_associations = options.delete(:include)
+          base_only_or_except = { :except => options[:except],
+                                  :only => options[:only] }
+
+          include_has_options = include_associations.is_a?(Hash)
+          associations = include_has_options ? include_associations.keys : Array(include_associations)
+
+          for association in associations
+            records = case @record.class.reflect_on_association(association).macro
+            when :has_many, :has_and_belongs_to_many
+              @record.send(association).to_a
+            when :has_one, :belongs_to
+              @record.send(association)
+            end
+
+            unless records.nil?
+              association_options = include_has_options ? include_associations[association] : base_only_or_except
+              opts = options.merge(association_options)
+              yield(association, records, opts)
+            end
+          end
+
+          options[:include] = include_associations
+        end
+      end
+
+      def serializable_record
+        returning(serializable_record = {}) do
+          serializable_names.each { |name| serializable_record[name] = @record.send(name) }
+          add_includes do |association, records, opts|
+            if records.is_a?(Enumerable)
+              serializable_record[association] = records.collect { |r| self.class.new(r, opts).serializable_record }
+            else
+              serializable_record[association] = self.class.new(records, opts).serializable_record
+            end
+          end
+        end
+      end
+
+      def serialize
+        # overwrite to implement
+      end
+
+      def to_s(&block)
+        serialize(&block)
+      end
+    end
+  end
+end
+
+require 'active_record/serializers/xml_serializer'
+require 'active_record/serializers/json_serializer'