使用redis和rails将多个项目添加到购物车

时间:2014-12-03 15:13:03

标签: javascript ruby-on-rails coffeescript redis

我一直在关注如何使用Rails,Redis和Braintree API创建购物车。 http://www.sitepoint.com/build-online-store-rails/

该指南教授如何将单个电影添加到购物车,一旦您将该电影添加到购物车,唯一可用的选项是将其从购物车中删除。我试图让它可以在购物车中添加同一部电影的多个副本。我如何实现这一目标?

与电影相反,我有专门小组。模型,视图和控制器如下所示

panels.rb

class Panel < ActiveRecord::Base
    has_many :purchases
    has_many :buyers, through: :purchases

    def cart_action(current_user_id)
      if $redis.sismember "cart#{current_user_id}", id
        "Remove from"
      else
        "Add to"
      end
    end
end

panels_controller.rb

class PanelsController < ApplicationController
        before_action :logged_in_user
        before_action :set_panel, only: [:show, :edit, :update, :destroy]

        # GET /panels
        # GET /panels.json
        def index
            @panels = Panel.all
        end

        def show
            @panel = Panel.find(params[:id])
            @cart_action = @panel.cart_action current_user.try :id
        end



   panels/show.html.erb

    <p id="notice"><%= notice %></p>

    <p>
      <strong>Title:</strong>
      <%= @panel.title %>
    </p>

    <p>
      <strong>Location:</strong>
      <%= @panel.location %>
    </p>

    <p>
      <strong>Price:</strong>
      <%= @panel.price %>
    </p>

    <%=link_to "", class: "btn btn-danger", data: {target: @cart_action, addUrl: add_to_cart_path(@panel), removeUrl: remove_from_cart_path(@panel)} do%>
        <i class="fa fa-shopping-cart"></i>
        <span><%=@cart_action%></span> Cart
    <%end%>

panels.js.coffee
$(window).load ->
  $('a[data-target]').click (e) ->
    e.preventDefault()
    $this = $(this)
    if $this.data('target') == 'Add to'
      url = $this.data('addurl')
      new_target = "Remove from"
    else
      url = $this.data('removeurl')
      new_target = "Add to"
    $.ajax url: url, type: 'put', success: (data) ->
      $('.cart-count').html(data)
      $this.find('span').html(new_target)
      $this.data('target', new_target)

由于我从本指南开始以来只进入了redis,所以任何帮助都会非常感谢!

1 个答案:

答案 0 :(得分:1)

我发现实现此目的的一种方法是将面板ID添加到哈希中,其中键是面板ID,而qty是值:

{ panel_id => qty }

使用hmset

$redis.hmset current_user_cart, panel, item_qty

这将在current_user_cart键下添加key =&gt;值对,以检索您可以使用hkeys的面板ID,它将检索所有哈希键:

panel_ids = $redis.hkeys current_user_cart

然后要获得qtys,你可以调用hgetall:

@cart_qtys = $redis.hgetall current_user_cart

将返回完整的哈希,例如{panel_id =&gt; qty},你可以参考。(应该注意,数量将作为字符串返回)