Save One-to-Many Relationship in Laravel 6 - laravel

Question

I have two Table that Transfer and Product that link One-to-Many Relationship. I'm to create relationship between Transfer and Product like Pics Below.
that get Selected Dropdown Product when Click Search.... and When Click Create save relationship Product into Transfers..
My Transfer Model
public function products()
{
return $this->hasMany(\App\Product::class);
}
My Product Model
public function transfer()
{
return $this->belongsTo(\App\Transfer::class);
}
in TransferController
public function store(Request $request)
{
$request->validate([
'from_location' => 'required',
'to_location' => 'required',
'status' => 'required',
'description' => 'nullable',
'shipping_charge' => 'nullable',
]);
$transfer = new Transfer();
$transfer->branch_id = auth()->user()->id;
$transfer->from_location = $request->input('from_location');
$transfer->to_location = $request->input('to_location');
$transfer->status = $request->input('status');
$transfer->shipping_charge = $request->input('shipping_charge');
$transfer->save();
// $products = new Product();
// $products->name = $request->input('')
return response()->json(['created' => true]);
}
I think its a dummy question, but i stuck 3 days with it. I'll appreciate of all Ur help...

Answer 1

You need to post the product_ids to backend that you selected,
and just update the relationship:
...
$transfer->shipping_charge = $request->input('shipping_charge');
$transfer->save();
Product::whereIn('id', $product_ids)->update(['transfer_id' => $transfer->id]);
If your products are all new, you can use saveMany:
$products = array(
new Product(['name' =>'product1', ...]),
new Product(['name' => 'product2', ...])
);
...
$transfer->save();
$transfer->products()->saveMany($products);