make it backwards compatible

Signed-off-by: Ethan Vizitei <ethan.vizitei@gmail.com>

Gemfile.lock

@@ -6,10 +6,20 @@ PATH
 GEM
   remote: http://rubygems.org/
   specs:
-    activerecord (2.3.12)
-      activesupport (= 2.3.12)
-    activesupport (2.3.12)
+    activemodel (3.0.9)
+      activesupport (= 3.0.9)
+      builder (~> 2.1.2)
+      i18n (~> 0.5.0)
+    activerecord (3.0.9)
+      activemodel (= 3.0.9)
+      activesupport (= 3.0.9)
+      arel (~> 2.0.10)
+      tzinfo (~> 0.3.23)
+    activesupport (3.0.9)
+    arel (2.0.10)
+    builder (2.1.2)
     diff-lcs (1.1.2)
+    i18n (0.5.0)
     rake (0.9.2)
     rspec (2.6.0)
       rspec-core (~> 2.6.0)
@@ -20,6 +30,7 @@ GEM
       diff-lcs (~> 1.1.2)
     rspec-mocks (2.6.0)
     sqlite3 (1.3.3)
+    tzinfo (0.3.29)
 
 PLATFORMS
   ruby

lib/acts_as_restful_list.rb

@@ -84,7 +84,17 @@ def reset_order_after_destroy
     end
 
     def initialize_order
-      self.class.where(scope_condition).select(:id).each_with_index do |item,idx|
+      initial_set = []
+
+      if self.class.respond_to? :where
+        #Rails 3.x
+        initial_set = self.class.where(scope_condition).select(:id).order("created_at ASC")
+      else
+        #Rails 2.x
+        initial_set = self.class.find(:all,:conditions=>scope_condition,:select=>"id",:order=>"created_at ASC")
+      end
+
+      initial_set.each_with_index do |item,idx|
         ActiveRecord::Base.connection.execute("update #{self.class.table_name} set position = #{idx + 1} where id = #{item.id};")
       end
     end