backend\models\GoodsSearch::rules PHP Method

    public function rules()
    {
        // only fields in rules() are searchable
        return [[['name', 'category_id', 'store_id', 'price', 'cost', 'sales', 'surplus', 'status', 'date'], 'safe'], [['date', 'price', 'sales', 'surplus'], 'trim']];
    }