Question

所以这是我在我的控制器中测试的动作

def add_to_cart
    @cart = current_cart
    if @cart.tutors.where(params[:tutor_id]).empty?
      @cart.add_tutor(params[:tutor_id])
      flash[:success] = 'You have successfully added the tutor to your shortlist!'
      redirect_to show_path
    else
      flash[:danger] = 'You have already shortlisted the tutor!'
      redirect_to show_path
    end
  end

如果购物车中存在tutor_id，我不确定这是否是正确的测试方法。我实际上尝试过在rails控制台中测试各种检查子属性的方法。我到达Parent.Child.where(:id => X)以检查是否有任何一个孩子有id = X。

这是调用该方法时在我的服务器（或开发日志）中显示的内容。

Started POST "/add_to_cart/11" for 116.87.14.150 at 2016-10-16 07:32:09 +0000
Cannot render console from 116.87.14.150! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
Processing by CartsController#add_to_cart as HTML
  Parameters: {"authenticity_token"=>"XzHaIJMzIz9I84W5tmLuj+28SBvVP9pc1JdZOyQaYEr286JNIw4J8tKtSON7eIWsdf0Lc6ogCdT2LrdtVVxGoA==", "tutor_id"=>"11"}
cart_id = 17
  Cart Load (0.2ms)  SELECT  "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT 1  [["id", 17]]
   (0.2ms)  SELECT COUNT(*) FROM "tutors" INNER JOIN "cart_tutors" ON "tutors"."id" = "cart_tutors"."tutor_id" WHERE "cart_tutors"."cart_id" = ? AND (11)  [["cart_id", 17]]

无论如何，它不断地处理else部分，这意味着它不像我想象的那样工作，这可能意味着它没有像我打算那样检查ID。我使用正确的方法吗？如果没有，我该怎么做呢？

Answer 1

你有一些错误：

@cart.tutors.where(params[:tutor_id]).empty?

它使得sql查询不正确：

WHERE "cart_tutors"."cart_id" = ? AND (11)

参见 AND（11）

尝试下一步：

@cart.tutors.where(id: params[:tutor_id]).empty?

防止向购物车添加重复项

1 个答案: