Fix https://github.com/firefly-iii/firefly-iii/issues/6787

app/Http/Controllers/Budget/EditController.php

@@ -40,10 +40,8 @@ use Illuminate\View\View;
  */
 class EditController extends Controller
 {
-    /** @var AttachmentHelperInterface Helper for attachments. */
-    private $attachments;
-    /** @var BudgetRepositoryInterface The budget repository */
-    private $repository;
+    private AttachmentHelperInterface $attachments;
+    private BudgetRepositoryInterface $repository;
 
     /**
      * EditController constructor.

app/Models/AutoBudget.php

@@ -25,6 +25,7 @@ declare(strict_types=1);
 namespace FireflyIII\Models;
 
 use Eloquent;
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\SoftDeletes;
@@ -88,4 +89,14 @@ class AutoBudget extends Model
     {
         return $this->belongsTo(TransactionCurrency::class);
     }
+
+    /**
+     * @return Attribute
+     */
+    protected function amount(): Attribute
+    {
+        return Attribute::make(
+            get: fn($value) => (string) $value,
+        );
+    }
 }