|string> */ public function rules(): array { return [ 'user_id' => 'required|integer', 'barcode_id' => 'required|string', 'material_name' => 'required|string', 'type' => 'required|in:serialized,consumable', 'serial_number' => 'nullable|string', 'qty' => 'nullable|numeric', 'unit' => 'nullable|string', ]; } }