Laravel paginate method not working with map collection?

Here's a cleaner way to handle this.

$items = Item::with('product')->paginate(10)
        ->through(function($product){
        $product->name = "Test";
        return $product;
    });

    return response()->json(['items' => $items]);

Unlike map() which returns a brand new collection, through() applies to the current retrieved items rather than a brand new collection

As, given in Laravel docs, map() method creates a new collection. To modify the values in the current collection, use transform() method.

$items->getCollection()->transform(function ($product) {
    $product->name = "Test";
    return $product;
});

Also, since, paginator's items are a collection. You can use foreach directly on $items

foreach ($items as $item)
{
 $item->name = "Test";
}