public function fetchAvailableOwners($category_id)
{
$json = array();
$owners = Owner::whereNotIn('id', function ($query) use($category_id) {
$query->select(['owner_id']);
$query->from('devices');
$query->where('category_id', $category_id);
})->get();
foreach ($owners as $owner) {
$json[] = ['name' => $owner->firstName . " " . $owner->lastName, 'id' => $owner->id];
}
return json_encode($json);
}
