/**
  * Get from query
  */
 public function get($page = null)
 {
     return $this->query(PurchaseOrder::with('supplier', 'client', 'items'), $page);
 }
 /**
  * Display a listing of the resource.
  *
  * @return \Illuminate\Http\Response
  */
 public function index()
 {
     // Retrieve all the purchase orders in the database and return them
     $purchaseOrders = PurchaseOrder::with('customer')->orderBy('created_at', 'desc')->get();
     return $purchaseOrders;
 }