Сохранение связи многие ко многим?

$list = $this->request->input('propertyList', []);

        $model->property()->detach(array_keys($list));

        foreach ($list as $propertyId => $row) {
            foreach ($row as $key => $value) {
                if (is_array($value)) {
                    foreach ($value as $item) {
                        $model->property()->attach([$propertyId => [$key => $item]]);
                    }
                } else {
                    $model->property()->attach([$propertyId => [$key => $value]]);
                }
            }
        }