add mutator for mission

app/Models/Mission.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\MorphToMany;
@@ -12,6 +13,13 @@ class Mission extends Model
 
     protected $guarded = [];
 
+    protected function requestedMachines(): Attribute
+    {
+        return Attribute::make(
+            get: fn ($value) => json_decode($value)
+        );
+    }
+
     public function roadItems(): MorphToMany
     {
         return $this->morphedByMany(RoadItemsProject::class, 'missionable');