Mine

<?php

class Article extends AppModel {

	var $belongsTo = array('ArticleCategory' =>
							array('className'		=> 'ArticleCategory',
									'conditions'	=> '',
									'order'			=> '',
									'dependent'		=> true,
									'foreignKey'	=> 'category_id'
							),
							'User' =>
							array('className'		=> 'User',
									'conditions'	=> '',
									'order'			=> '',
									'dependent'		=> true,
									'foreignKey'	=> 'user_id'
							)

					);
	var $hasMany = array('Comments' =>
							array('className'	=> 'Comment',
								'conditions'	=> 'Comment.parenttype = article',
								'order'			=> 'Comment.datetime DESC',
								'limit'			=> '5',
								'foreignKey'	=> 'parent_id',
								'dependent'		=> true,
								'exclusive'		=> false,
							)
					);
}

?>