convert many to many to one to many

app/Http/Requests/V3/Mission/TransportaionUnit/AllocateRequest.php

@@ -3,8 +3,10 @@
 namespace App\Http\Requests\V3\Mission\TransportaionUnit;
 
 use App\Enums\MissionStates;
+use App\Models\Mission;
 use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Validator;
 
 class AllocateRequest extends FormRequest
 {
@@ -24,10 +26,27 @@ class AllocateRequest extends FormRequest
     public function rules(): array
     {
         return [
-            'machines' => 'required|array',
-            'machines.*' => 'required|integer|exists:cmms_machines,id',
+            'machine_id' => 'required|integer|exists:cmms_machines,id',
             'driver' => 'required|integer|exists:rahdaran,id',
-            'km' => 'required',
+        ];
+    }
+
+    public function after(): array
+    {
+        return [
+            function (Validator $validator) {
+                $duplicateMission = Mission::query()->where('machine_id', $this->machine_id)
+                    ->whereBetween('start_date', [$this->mission->start_date, $this->mission->end_date])
+                    ->orWhereBetween('end_date', [$this->mission->start_date, $this->mission->end_date])
+                    ->exists();
+
+                if ($duplicateMission) {
+                    $validator->errors()->add(
+                        'machine',
+                        'خودروی مورد نظر در این زمان رزرو می باشد'
+                    );
+                }
+            },
         ];
     }
 }