Как добавить вычисляемое поле к модели поиска в yii2

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class ProductSearch extends Product
{
    public $total;

    public function rules()
    {
        return [
            [['price', 'quantity', 'total'], 'safe'],
        ];
    }

    public function afterFind()
    {
        parent::afterFind();
        $this->total = $this->price * $this->quantity;
    }
}

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$searchModel = new ProductSearch();
$dataProvider = $searchModel->search(Yii::$app->request->queryParams);

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$searchModel->total = 100;
$dataProvider = $searchModel->search(Yii::$app->request->queryParams);