/**
  * 添加商品SKU
  *
  * @param $id
  * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
  */
 public function store($id)
 {
     if ($id) {
         $network = Input::get('network');
         $memory = Input::get('memory');
         $color = Input::get('color');
         $storage = Input::get('storage');
         $img = Input::get('image', 0);
         $price = Input::get('price');
         if ($price) {
             $sku = new PhoneSku();
             $sku->network_id = $network;
             $sku->storage_id = $storage;
             $sku->color_id = $color;
             $sku->memory_id = $memory;
             $sku->image_id = $img;
             $sku->price = $price;
             $sku->product_id = $id;
             if ($sku->save()) {
                 return redirect("admin/product/sku/show/{$id}");
             }
         }
     }
     return redirect()->back();
 }