建议慎用路由模型绑定

路由模型绑定(隐式绑定)：

public function disfavor(Product $product, Request $request)
{
  $user = $request->user();
  $user->favoriteProducts()->detach($product);

  return [];
}

SQL：

单一的路由参数：

public function disfavor($product_id, Favorite $favorite) {
    $where = [
                'user_id'    => Auth::id(),
                'product_id' => $product_id,
            ];
    $favorite->where($where)->delete();

     return [];
}

SQL：