How to use sync eloquent method - laravel

Question

Hello i am trying to make a code that updates existing values by removing existing ones/add new ones or make changes in the existing values. This is the code i have done so far:
public function update(Request $request, $id)
{
$order = Order::find($id);
$request->validate([
'order_number' => 'required',
'client_id' => 'required',
'description' => 'required',
'productOrder' => 'required',
'productOrder.*.product_id' => 'required|distinct|exists:products,id',
'productOrder.*.amount' => 'required|numeric|min:1',
]);
$order->update($request->all());
foreach ($request->productOrder as $product) {
$values[] = [
'order_id' => $order->id,
'product_id' => $product['product_id'],
'amount' => $product['amount'],
];
$amount = Product::find($product['product_id']);
$totalValue = $product['amount'] + $amount->amount;
$amount->update(['amount' => $totalValue]);
// $order->products()->sync([$product['product_id'] => array(
// 'product_id' => $product['product_id'],
// 'amount' => $product['amount'], THIS CODE MAKES ERROR BY DELETING ALL THE VALUES EXCEPT ONE
// )]);
}
$order->products()->detach();
$order->products()->attach($values); //I WANT THE CODE TO DO THIS FUNCTIONS BASICALLY
$orders = Order::all();
$orders->load('client', 'products');
return view('orders/index', compact('orders'));
}

Answer 1

I think you should use this
$values = [];
foreach ($request->productOrder as $product) {
/* This is the sync id && This is the pivot column */
$values[$product['product_id']] = ['amount' => $product['amount']];
$amount = Product::find($product['product_id']);
$totalValue = $product['amount'] + $amount->amount;
$amount->update(['amount' => $totalValue]);
}
// $values keys must be a product_id and its value must be pivot values
$order->products()->sync($values);