Laravel更新所有相关模型

Question

我有：

    $enquiry = Enquiry::find($id);
    $enquiry->load('parts', 'buyingParts', 'fees', 'buyingFees');
    $duplicate = $enquiry->replicate();

    $next_number_e = Enquiry::where('display_code', $duplicate->display_code)->max('display_number') + 1;

    $duplicate->display_number = $next_number_e;

    $duplicate->push();
    $duplicate->parts()->update(['enquiryId' => $duplicate->id]);
    $duplicate->parts->save();

但这不起作用。

如何更新与重复相关的所有部分的所有属性enquiryId？