Rails购物车-如何在没有用户获得404的情况下销毁它们？

在Rails 5电子商务站点中，由于代码写得不好，传统购物车模型中的购​​物车没有被销毁，因此，现在heroku数据库中有超过10000行的空购物车。如果我从heroku控制台中销毁了它们，那么下一次已经来该站点但在购买过程中放弃的用户尝试访问该站点，将收到如下404错误消息：

ActiveRecord::RecordNotFound (Couldn't find Cart with 'id'=305)

因为饼干，显然。heroku数据库已超出其分配的存储容量，因此我需要销毁空车。（并修复代码，但这不是这里的问题）。有没有办法顺利进行此操作？

class CartsController < ApplicationController
  def show
    @cart = @current_cart
    total = []
    @cart.order_items.each do |item|

      total << item.product.price_cents * item.quantity.to_i
    end

    @cart.amount_cents_cents = total.sum

  end

  def destroy
    @cart = @current_cart
    @cart.destroy
    session[:cart_id] = nil
    redirect_to root_path
  end
end

class OrdersController < ApplicationController

  before_action :authenticate_user!

  def create
    @order = Order.new

    total = []
    @current_cart.order_items.each do |item|

      total << item.product.price_cents * item.quantity.to_i
    end

    @order.amount_cents_cents = total.sum

    if @order.amount_cents_cents == 0
       redirect_to root_path
    else
      @current_cart.order_items.each do |item|
        @order.order_items << item
        item.cart_id = nil
      end

      @user = current_user
      @order.user_id = @user.id
      @order.save

      Cart.destroy(session[:cart_id])
      session[:cart_id] = nil

      redirect_to order_path(@order)
    end
  end

class ApplicationController < ActionController::Base

  before_action  :current_cart

  def current_cart

        if session[:cart_id]
          cart = Cart.find(session[:cart_id])
          if cart.present?
            @current_cart = cart
          else
            session[:cart_id] = nil
          end
        end


        if session[:cart_id] == nil
          @current_cart = Cart.create
          session[:cart_id] = @current_cart.id
        end
  end