@foreach ($products as $product)
    <tr>
        <td>{{ ++$i }}</td>
        <td>{{ $product->nombre }}</td>
        <td>{{ $product?->brand?->name }}</td>
        <td>{{ $product?->categoria }}</td>
        <td>{{ $product?->clase }}</td>
        <td>{{ $product->capacidad }}</td>
        <td>{{ $product->cantidad - (int)$product->prestados }}</td>
        <td>
            <a class="btn btn-info" href="#" onclick="addProduct({{ $product->id }}, 'quantity_{{$i}}')">
                A&ntilde;adir
            </a>
        </td>
    </tr>
@endforeach