public function confirmEmailByToken($token)
{
$source = Source::whereEmailToken($token)->with(['customers', 'customers.samples' => function ($query) {
$query->orderBy('created_at', 'desc');
}])->first();
if ($source) {
$source->email_token = null;
$source->email_confirmed = true;
$source->save();
}
return $source;
}