调用销毁操作时资源未被删除 [Rails 7]

Question

我对 Rails 还比较陌生，我正在学习教程。其中一个单元测试（使用rails Minitest）已经指出了这个问题。

这里

test/controllers/carts_controller_test.rb

我断言调用delete后购物车数量减少了1。

test "should destroy cart" do
    post line_items_url, params: { product_id: products(:ruby).id }
    @cart = Cart.find(session[:cart_id])

    assert_difference("Cart.count", -1) do
      delete cart_url(@cart)
    end

    assert_redirected_to store_index_url
  end

这映射到我在

controllers/carts/controller.rb

中的破坏行动，如下所示

def destroy    
    @cart.destroy! if @cart.id == session[:cart_id]
    @cart.save
    session[:cart_id] = nil

    respond_to do |format|
      format.html { redirect_to store_index_url,
        notice: 'Your cart is currently empty' }
      format.json { head :no_content }
    end
  end

但是，当我运行

bundle exec rails test

时，我得到以下输出：

# Running:

.............F

Failure:
CartsControllerTest#test_should_destroy_cart [...test/controllers/carts_controller_test.rb:46]:
"Cart.count" didn't change by -1.
Expected: 2
  Actual: 3


rails test test/controllers/carts_controller_test.rb:42

................

Finished in 0.651308s, 46.0612 runs/s, 98.2638 assertions/s.
30 runs, 64 assertions, 1 failures, 0 errors, 0 skips

当我尝试使用 ERB 模板中呈现的按钮进行删除时

<%= button_to 'Empty Cart', cart, method: :delete,
  class: "ml-4 rounded-lg py-1 px-2 text-white bg-green-600" %>

我可以看到以下错误：

ActionController::RoutingError (No route matches [DELETE] "/carts"):

但是，当我通过运行

bundle exec rails routes

进行交叉检查时，我可以确认该路线确实存在：

DELETE /carts/:id(.:format) carts#destroy

我不确定什么在这里不起作用，并且很想得到一些建议。我尝试搜索其他帖子，并与巴德合作，但未能找到有效的解决方案。预先感谢！