I am having problem to count number of devices where `guid` is not null.

It need to get all the shops by user `user_id` and then count all the devices where `guid` is not null.

```
$shops = Shop::with('devices')->where('user_id', $userId)->get();

$deviceActive = $shops->reduce(function ($carry, $item) {
     return $carry + $item->devices->whereNotNull('guid')->count();
});

dd($deviceActive );

```

It work when I do:

```
return $carry + $item->devices->count();

```

but it need to count where `guid` is not null.

I would also be interested to hear if there is alternative `reduce` approach.