[Rails] Single table inheritance - HowTo?

[Iván Vega Rivera]

Hi,

As per another member's suggestion, I'm trying to user STI. So I have 
this table:

CREATE TABLE `settings` (
  `id` int(11) unsigned NOT NULL auto_increment,
  `type` char(40) NOT NULL default 'General',
  `name` char(40) NOT NULL default '',
  `value` char(128) NOT NULL default '',
  `updated_on` datetime default NULL,
  `comments` char(255) default NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

And a row with a type = 'General', and name = 'front-page'

Then I have a setting.rb model, and also general_setting.rb and 
user_setting.rb, where I only have:

class <TYPE>Setting < Setting
end

So, if I do General.find_by_name('front-page'), I expected to get the 
value of the corresponding row, instead I get a nil object.

What could I possibly be doing wrong?

Thanks!

Ivan V.