model with boolean column "notify" raises ArgumentError on save

Here's the model:

 CREATE TABLE  `webapp`.`posts` (
   `id` int(8) NOT NULL AUTO_INCREMENT,
   `user_id` int(8) DEFAULT '0',
   `position` int(4) DEFAULT '0',
   `dthread_id` int(8) DEFAULT NULL,
   `parent_id` int(8) DEFAULT NULL,
   `notify` tinyint(1) DEFAULT '0',
   `post` text,
   `lock` tinyint(1) DEFAULT '0',
   `created_at` datetime DEFAULT '0000-00-00 00:00:00',
   `updated_at` datetime DEFAULT '0000-00-00 00:00:00',
   PRIMARY KEY (`id`)
 ) ENGINE=MyISAM AUTO_INCREMENT=31 DEFAULT CHARSET=utf8

The model post.rb is empty:

 class Post < ActiveRecord::Base
 end

A new post cannot be saved:

ArgumentError (wrong number of arguments (1 for 0)):
     /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/callbacks.rb:321:in `notify'
     /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/callbacks.rb:321:in `callback'
     /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/callbacks.rb:282:in `valid?' .....

Changing the name of the column "notify" to "notifyme" allows the post to be saved.