private function getContacts($expression)
{
$businesses = Business::whereIn('id', $this->scope['businessesIds'])->get();
foreach ($businesses as $business) {
$collection = $business->contacts()->where(function ($query) use($expression) {
$query->where('lastname', 'like', $expression . '%')->orWhere('firstname', 'like', $expression . '%')->orWhere('nin', $expression)->orWhere('mobile', 'like', '%' . $expression);
})->get();
$this->results['contacts'] = $collection;
}
}