Question

在我目前的购物车设置中，我为用户提供了在他的会话中将项目添加到购物车的功能。购物车获取会话ID和产品信息，并创建新的@cart.lineitems记录。但是，当用户的会话结束时，他们的购物车不会从数据库中删除。这会在我的代码中产生打嗝并留下一个混乱的平板。我的问题是如何在用户会话结束时删除当前的购物车行？

代码：

模型

class Views::CartsController < ApplicationController
    layout 'views'
    def show
    @cart = current_cart
  end
end

    class Views::Cart < ActiveRecord::Base
      # attr_accessible :title, :body
      has_many :line_items, :dependent => :destroy
      has_one :order, :dependent => :destroy

      def total_price
        # convert to array so it doesn't try to do sum on database directly
        line_items.to_a.sum(&:full_price)
      end
    end
    class Views::LineItem < ActiveRecord::Base
        attr_accessible :cart, :quantity, :image, :unit_price, :product_id, :album_id
      belongs_to :cart
      belongs_to :image
      accepts_nested_attributes_for :image

      def full_price
        unit_price * quantity
      end
    end

控制器

class Views::LineItemsController < ApplicationController
    layout 'views'
    def create
    @product = Image.find(params[:product_id])
    @album = @product.album
    attr = {:cart => current_cart, :album_id => @album.id, :product_id => @product.id, :quantity => 1, :unit_price => 10}
    @current = Views::LineItem.find_by_product_id(@product.id)
    if @current.nil?
        Views::LineItem.create(attr)
    else
        @current.update_attributes(:quantity => @current.quantity + 1, :cart => current_cart)
    end
    # @line_item = @current ? Views::LineItem.create(:cart => current_cart, :album_id => @album.id, :product_id => @product.id, :quantity => 1, :unit_price => 10) : @current.update_attribute(:quantity, @current.quantity + 1)
    flash[:notice] = "Added #{@product.title} to cart."
    redirect_to current_cart_url
  end
  def destroy
    @line_item = Views::LineItem.find(params[:id])
    if @line_item.quantity > 1
        @line_item.update_attribute(:quantity, @line_item.quantity - 1)
    else
        @line_item.destroy
    end
    redirect_to current_cart_url
  end
end

Answer 1

我可能不对，但按照你所说的你可能希望在CartsController

中有类似的内容

class CartsController < ApplicationController

      def destroy
        @cart = current_cart #Get current cart
        @cart.destroy #call destroy method on the current cart
        session[:cart_id] = nil #Ensuring that user is deleting their own cart
        respond_to do |format|
          format.html { redirect_to(root_url,
                                    :flash => {:error => 'Your cart is currently empty'}) }
        end
      end
    end

或者可以尝试在application_controller

中使用以下内容

  def current_cart  
    if user_signed_in?
      if session[:cart_id]  
        @current_cart ||= current_user.carts.find(session[:cart_id])
        if @current_cart.purchased_at || @current_cart.expired?
          session[:cart_id] = nil
        end
      end  
      if session[:cart_id].nil?  
        @current_cart = current_user.carts.create!  
        session[:cart_id] ||= @current_cart.id  
      end
    end
    @current_cart  
  end

Answer 2

您可以将user_id和session_id存储在购物车行中，然后将其范围限定为仅查看与其当前会话相关的项目。如果您想定期清理表格，请设置一个cron作业。

http://guides.rubyonrails.org/action_controller_overview.html#session

https://github.com/javan/whenever

会话结束Rails时清除表

2 个答案: