public function getDescriptorDefaultOrder($alias = '{alias}', $order = SORT_ASC)
    {
        $descriptorField = $this->descriptorField;
        if (!is_array($descriptorField)) {
            $descriptorField = [$descriptorField];
        }
        $descriptorField = array_reverse($descriptorField);
        $sortBy = [];
        foreach ($descriptorField as $field) {
            if (!$this->hasAttribute($field)) {
                continue;
            }
            $sortBy[$alias . '.' . $field] = $order;
        }

        return $sortBy;
    }