php - Yii relation STAT with multiple columns -

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i'm trying stat relation review table. code

public function relations()     {         return array(             'avaragerating' => array(self::stat, 'reviews', array('make_code'=>'make_code', 'model_code'=>'model_code', 'year'=>'year'), 'select' => 'avg(overall_rating)'),     }

the table this

make_code | model_code | year | overall_rating 01        | 02         | 2015 | 4.2 01        | 03         | 2014 | 4.0 01        | 02         | 2015 | 3.0

i want overall_rating average rows have same make_code, model_code , year

example, make_code 01, model_code 02 , year 2015. (4.2+3.0 / 2), $model->avaragerating should give me 3.6

right now, when call relation using $model->avaragerating; error

preg_match() expects parameter 2 string, array given

any idea i'm doing wrong?

edited: 

function getavaragerating() {         $criteria = new cdbcriteria();         $criteria->select='round(avg(overall_rating), 1) avg, count(overall_rating) total';         $criteria->addcondition("make_code=:make_code");         $criteria->addcondition("model_code=:model_code");         $criteria->addcondition("year=:year");         $criteria->params = array(':make_code' => $this->make_code, ':model_code' => $this->model_code, ':year' => $this->year);           $query = reviews::model()->find($criteria);          return $query;     }

i added function in model, , workws. there way use relations instead?

seems collection result should access index , try accessing first element 

 $model[0]->avaragerating;




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