input quantity item pada laravel

mau nanya nih baru belajar laravel shopping cart ketika saya ingin tambahkan inputan jumlah barang pada suatu halaman single kenapa ketika saya request selalu null ya untuk qty nya ketika saya coba untuk diedump?

bladenya seperti ini

 <div class="media-body">
                  <ul class="list-inline">
                    <li><a href="{{route('shop')}}"><i class="fa fa-reply" aria-hidden="true"></i>Continue Shopping</a></li>
                    <li><a href="#"><i class="fa fa-plus" aria-hidden="true"></i>{{$products->kategori->namakategori}}</a></li>
                  </ul>
                  <h2>{{$products->name}}</h2><br>
                  <h3>RP {{$products->price}}.-</h3>
                  <p>{{$products->deskripsibarang}}</p>

                  <span class="quick-drop resizeWidth">
                   <input class="form-control" name="qty" type="number">
                  </span>

                  <div class="btn-area">
                    <a href="{{ route('add_to_cart', ['id' => $products->id])}}" class="btn btn-primary btn-block">Add to cart <i class="fa fa-angle-right" aria-hidden="true"></i></a>

controllernya seperti ini

 public function addToCart(Request $request, $id){
        $this->data['kategorishop'] = Kategori::all();
        $this->data['kategoris'] = Kategori2::all();
        $this->data['departemens'] = Departemen::orderBy('created_at', 'DESC')->take(4)->get();
        $this->data['infos'] = Info::all();

        $product = Produk::find($id);
        $id          = $product->id;
        $name        = $product->name;
        $price       = $product->price;
        $qty         = $request->qty;

        $data = array('id'          => $id,
                      'name'        => $name,
                      'qty'         => $qty,
                      'price'       => $price
                      );

        Cart::add($data);
        $cart_content = Cart::content();
        return View ('shop.showcart', $this->data, ['cart_content' => $cart_content]);
    }