public function listAll(Request $request, $page = 1)
{
$page--;
$total = Contract::all()->count();
$contracts = Contract::skip($page * self::PAGE_SIZE)->take(self::PAGE_SIZE)->get();
$response = ["contracts" => $contracts, "total" => $total, "page" => $page + 1, "page_size" => self::PAGE_SIZE];
return response()->json($response)->header('Access-Control-Allow-Origin', '*');
}
