create new controller and fix the other

app/Models/Harim.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\HasMany;
@@ -14,4 +15,12 @@ class Harim extends Model
     public function histories(): HasMany
     {
         return $this->hasMany(HarimHistory::class);
-    }}
+    }
+
+    protected function polygon(): Attribute
+    {
+        return Attribute::make(
+            get: fn($value) => json_decode($value)
+        );
+    }
+}