public function count($alias = null)
    {
        if ($this->controller && $this->controller->hasMethod('count')) {
            return $this->controller->count($this, $alias);
        }
        throw $this->exception('The controller doesn\'t support count', 'NotImplemented')
            ->addMoreInfo('controller', $this->controller ? $this->controller->short_name : 'none');
    }