[cakephp]Model::find()でcountとかsumとか上手くとる方法

surveys_controller.php

 <?php
     $this->SurveyResponse->virtualFields['count'] = 0;
      $data = $this->SurveyResponse->find(
        'all',
        array(
          'fields' => array(
            'SurveyResponse.response_value',
            'count(id) as "SurveyResponse__count"',
          ),
          'conditions' => array(
            'SurveyResponse.survey_question_id' => $survey_question_id,
          ),
          'group' => array('SurveyResponse.response_value'),
          'recursive' => -1,
        )
      );