Add AMS support to AR objects

test/fixtures/active_record.rb

@@ -0,0 +1,20 @@
+require 'active_record'
+
+ActiveRecord::Base.establish_connection(
+  :adapter  => 'sqlite3',
+  :database => ':memory:'
+)
+
+ActiveRecord::Schema.define do
+  create_table :ar_models, :force => true do |t|
+    t.string :attr1
+    t.string :attr2
+  end
+end
+
+class ARModel < ActiveRecord::Base
+end
+
+class ARModelSerializer < ActiveModel::Serializer
+  attributes :attr1, :attr2
+end