CakePHP和GROUP BY

使用Cake PHP 1.2,我正在尝试生成一个GROUP BY查询：

SELECT `categories`.*,COUNT(`entities`.id)
FROM `categories` 
LEFT JOIN `entities` ON (`categories`.`id` = `entities`.`category_id`)
GROUP BY `categories`.`id`

这样做/我该怎么办？我正在使用“可容纳”,如果这有帮助.

这是我所了解的：

$options = array(
                    'conditions' => $conditions,'fields'=>array('Category.*','COUNT(`Entity`.`id`) as `entity_count`'),'joins' => array('LEFT JOIN `entities` AS Entity ON `Entity`.`category_id` = `Category`.`id`'),'group' => '`Category`.`id`','contain' => array('Domain' => array('fields' => array('title')))
                );

                return $this->find('all',$options);