update: add inventory limit

app/Http/Controllers/User/OrderController.php

@@ -9,6 +9,7 @@ use App\Models\Payment;
 use App\Services\CouponService;
 use App\Services\OrderService;
 use App\Services\PaymentService;
+use App\Services\PlanService;
 use App\Services\UserService;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Cache;
@@ -75,7 +76,9 @@ class OrderController extends Controller
             abort(500, __('You have an unpaid or pending order, please try again later or cancel it'));
         }
 
-        $plan = Plan::find($request->input('plan_id'));
+        $planService = new PlanService($request->input('plan_id'));
+
+        $plan = $planService->plan;
         $user = User::find($request->session()->get('id'));
 
         if (!$plan) {
@@ -153,6 +156,10 @@ class OrderController extends Controller
             }
         }
 
+        if (!$planService->decrementInventory()) {
+            abort(500, __('Failed to create order'));
+        }
+
         if (!$order->save()) {
             DB::rollback();
             abort(500, __('Failed to create order'));

app/Services/OrderService.php

@@ -249,6 +249,11 @@ class OrderService
                 return false;
             }
         }
+        $planService = new PlanService($order->plan_id);
+        if (!$planService->incrementInventory()) {
+            DB::rollBack();
+            return false;
+        }
         DB::commit();
         return true;
     }

app/Services/PlanService.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\Plan;
+
+class PlanService
+{
+    public $plan;
+
+    public function __construct(int $planId)
+    {
+        $this->plan = Plan::lockForUpdate()->find($planId);
+    }
+
+    public function incrementInventory()
+    {
+        if ($this->plan->inventory_limit !== NULL) {
+            return $this->plan->increment('inventory_limit');
+        }
+    }
+
+    public function decrementInventory()
+    {
+        if ($this->plan->inventory_limit !== NULL) {
+            return $this->plan->decrement('inventory_limit');
+        }
+    }
+}