Mysql GROUP in containable not working

Hey all,

Trying to use GROUP by in containable behaviour and it's not working as expected.

Ratings model has fields: Rating.id, Rating.restaurant_id, Rating.rating (1-5)

I have a query (which amongst other things) fetches the average + total ratings for a restaurant:

$restaurant = $this->Restaurant->find('first', array(

    'fields' => array(Restaurant.x, Restaurant.y, Restaurant.z),

    'contain' => array(

        'model1' => array(x, y, z),

        'Rating' => array(

          'fields' => array(

            'AVG(Rating.rating)',

            'COUNT(Rating.id)'

          )

        ),

        'model2' => ...

    )

));

It works fine on my mysql version 5.0 on my dev server but as soon as I upload it onto live site mysql 4.1 I get error saying I cannot mix group columns (avg, sum, etc) is illegal without a GROUPBY field.

So ok fair play, I'm not including a groupby field. I jumped in and added one:

$restaurants = $this->Restaurant->find('all', array(

    'fields' => array(Restaurant.x, Restaurant.y, Restaurant.z),

    'contain' => array(

        'model1' => array(x, y, z),

        'Rating' => array(

          'fields' => array(

            'AVG(Rating.rating)',

            'COUNT(Rating.id)'

          ),

          'group' => 'Restaurant.id'       // I also tried 'group' => 'id'

        ),

        'model2' => ...

    )

));

Which I would figure works but it doesn't. I get an error saying that there is no column called 'group' and it is trying to execute this query: 

SELECT `Rating`.`restaurant_id`, AVG(`Rating`.`rating`), COUNT(`Rating`.`id`), `Rating`.`group` FROM `ratings` AS `Rating` WHERE `Rating`.`restaurant_id` = (5)

Am I using containable incorrectly?

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