rails create方法ActiveModel::ForbiddenAttribute的问题

rails create方法ActiveModel::ForbiddenAttribute的问题

  def create
    @ad = Ad.new(ad_params)
    @ad.save
  end

private
  def ad_params
    params.require(:ad).permit(:name, :description, :price, :seller_id, :email, :img_url)
  end