Laravel many to many relationship update - laravel

Question

I have some hard time with many to many relationship when I try to update the pivot columns.
Here is my database 'order_product' table
order_product_table
First, I am trying to update the products of that order.
Order update form
Here is the HTML:
#if($products)
<select class="form-control kt-select2 products" name="products[]" required>
<option selected disabled>Select a product</option>
#foreach($products as $product)
<option value="{{ $product->id }}" data-price="{{ $product->selling_price }}" {{ $product->id === $order_product->id ? 'selected' : '' }}>{{ $product->name }}</option>
#endforeach
</select>
#endif
My spaghetti code...
public function update(Order $order)
{
$attributes = $this->validateOrder();
$order->update($attributes);
$products = \request('products');
$quantity = \request('quantity');
$price = \request('price');
$discount = \request('discount');
$total = 0;
if ($products) {
$order->products()->sync([$order->id => ['product_id' => $products]]);
}
$this->flashMessage('success', 'Your order was updated with success!');
return redirect()->back();
}
Try a lot of things, but it does not work ...

Answer 1

Edit your code like this:
public function update(Order $order)
{
$attributes = $this->validateOrder();
$order->update($attributes);
//should be an array of products ID
$products = \request('products');
$quantity = \request('quantity');
$price = \request('price');
$discount = \request('discount');
$total = 0;
foreach($products as $key => $productId) {
//normalize attributes
$attributes = [
'price' => $price[$key],
'quantity' => $quantity[$key],
'discount' => $discount[$key],
];
$order->products()->updateExistingPivot($productId, $attributes);
}
$this->flashMessage('success', 'Your order was updated with success!');
return redirect()->back();
}
For more information about updateExistingPivot() method, check Laravel documention

Answer 2

For the sync() method in many to many relation, you need to provide the relation ID as index of the array.
$syncable = [];
foreach ($products as $key => $productId) {
$syncable[$productId] = [
'price' => $attributes['price'][$key],
'quantity' => $attributes['quantity'][$key],
'discount' => $attributes['discount'][$key]
]
}
if ($syncable) {
$order->products()->sync($syncable);
}