use element update route

backend/app/Controllers/ElementController.php

@@ -55,7 +55,7 @@ class ElementController
         ], 200);
     }
 
-    public function update(?int $id, Request $request): JsonResponse
+    public function update(Request $request): JsonResponse
     {
         $iconImage = $this->uploadedFileInput($request, 'iconImage');
         $pdf = $this->uploadedFileInput($request, 'pdf');
@@ -63,7 +63,7 @@ class ElementController
         try {
             $element = $this->updateElement->execute(
                 new UpdateElementRequest(
-                    id: $id,
+                    id: $this->intInput($request, 'elementId'),
                     title: $this->stringInput($request, 'title'),
                     description: $this->stringInput($request, 'description'),
                     iconImageUrl: $this->stringInput(
@@ -98,6 +98,20 @@ class ElementController
         ], 200);
     }
 
+    private function intInput(Request $request, string $key): ?int
+    {
+        $value = $request->input($key);
+        if (is_int($value)) {
+            return $value;
+        }
+
+        if (is_string($value) && ctype_digit($value)) {
+            return (int) $value;
+        }
+
+        return null;
+    }
+
     private function stringInput(Request $request, string $key): ?string
     {
         $value = $request->input($key);