Make sure Model#touch doesn't try to update non existing columns

activerecord/lib/active_record/timestamp.rb

@@ -67,7 +67,7 @@ module ActiveRecord
     end
 
     def timestamp_attributes_for_update_in_model
-      timestamp_attributes_for_update.select { |c| respond_to?(c) }
+      timestamp_attributes_for_update.select { |c| self.class.column_names.include?(c.to_s) }
     end
 
     def timestamp_attributes_for_update #:nodoc:

activerecord/test/models/task.rb

@@ -1,3 +1,5 @@
 class Task < ActiveRecord::Base
-
+  def updated_at
+    ending
+  end
 end