Inheritance for BaseWithoutTable.diff

diff --git a/activerecord_base_without_table/lib/active_record/base_without_table.rb b/activerecord_base_without_table/lib/active_record/base_without_table.rb
index 429d121..c6af6eb 100644
--- a/activerecord_base_without_table/lib/active_record/base_without_table.rb
+++ b/activerecord_base_without_table/lib/active_record/base_without_table.rb
@@ -1,6 +1,8 @@
 module ActiveRecord
   class BaseWithoutTable < Base
     self.abstract_class = true
+    class_inheritable_array :columns
+    self.columns = []
     
     def create_or_update
       errors.empty?
@@ -10,10 +12,6 @@ module ActiveRecord
     private :quoted_id
     
     class << self
-      def columns()
-        @columns ||= []
-      end
-      
       def column(name, sql_type = nil, default = nil, null = true)
         columns << ActiveRecord::ConnectionAdapters::Column.new(name.to_s, default, sql_type.to_s, null)
         reset_column_information
diff --git a/activerecord_base_without_table/test/active_record_base_without_table_test.rb b/activerecord_base_without_table/test/active_record_base_without_table_test.rb
index 26663ba..ed3b949 100644
--- a/activerecord_base_without_table/test/active_record_base_without_table_test.rb
+++ b/activerecord_base_without_table/test/active_record_base_without_table_test.rb
@@ -7,6 +7,10 @@ class Person < ActiveRecord::BaseWithoutTable
   validates_presence_of :name
 end
 
+class Employee < Person
+  column :salary, :integer
+end
+
 class House < ActiveRecord::BaseWithoutTable
   column :person, :string
   serialize :person
@@ -54,4 +58,13 @@ class ActiveRecordBaseWithoutTableTest < Test::Unit::TestCase
     assert_kind_of String, quoted
     assert_match /---/, quoted
   end
+
+  def test_inheritance
+    e = Employee.new
+    e.salary = 5000
+    e.name = "Enoch Root"
+
+    assert_equal "Enoch Root", e.name
+    assert_equal 5000, e.salary
+  end
 end