Question

我的电子商务应用中的购物车存在问题。当用户登录并将项目添加到购物车时，该项目不会立即添加。用户必须返回并在进入购物车之前再次添加它。

我查看了日志，并且我已经能够发现当用户之前购买了某些东西并且稍后签署购买时会出现问题。下次他们登录购买另一件商品时，是什么时候发生的。

系统会尝试删除旧购物车并创建一个新购物车但最终会发生的情况是，新购物车在首次尝试时显示为空。

有没有办法避免这种情况？

任何帮助将不胜感激。提前谢谢！

class CartsController < ApplicationController
 def create
  @cart = Cart.new(cart_params)

  respond_to do |format|
  if @cart.save
    format.html { redirect_to @cart, notice: 'Cart was successfully created.' }
    format.json { render :show, status: :created, location: @cart }
  else
    format.html { render :new }
    format.json { render json: @cart.errors, status: :unprocessable_entity }
  end
end
end

购物车控制器创建动作

class Cart < ActiveRecord::Base
has_many :line_items, dependent: :destroy
belongs_to :user

def add_product(product_id, size)
    current_item = line_items.find_by(product_id: product_id, size: size)
    if current_item
        current_item.quantity += 1
    else
        current_item = line_items.build(product_id: product_id, size: size)
    end
    return current_item
end

def total_price
    line_items.to_a.sum { |item| item.total_price }
end

end

购物车型号

class User < ActiveRecord::Base
 devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable, :invitable,
has_one :cart
after_create :default_cart

def add_products_from_session cart_id
if role == customer?
  session_cart = Cart.find cart_id if cart_id
end
if cart && session_cart
  session_cart.line_items.each{ |li| self.cart.line_items << li }
  session_cart.reload
  session_cart.destroy
elsif session_cart
  self.cart = session_cart
end

private
  def default_cart
   self.create_cart
  end
end

用户模型

  def create
product = Product.find(params[:product_id])
@line_item = @cart.add_product(product.id, params[:size])

respond_to do |format|
  if @line_item.save
    format.html { redirect_to customer_cart_path }
    format.json { render :show, status: :created, location: @line_item }
  else
    format.html { render :new }
    format.json { render json: @line_item.errors, status: :unprocessable_entity }
  end
end
end

将产品添加到购物车的代码

来自订单项控制器

cls 
$Now = Get-Date 
$Days = "21" 
$Targetfolder = "c:\TEST" 
#----- define LastWriteTime parameter based on $Days ---# 
$LastWrite = $Now.AddDays(-$Days) 
#----- get files based on lastwrite filter and specified folder ---# 
$Files = Get-Childitem $TargetFolder -Include $Extension -Exclude *.xml -Recurse | where { $_.LastWriteTime -le "$LastWrite" } 
foreach ($File in $Files) { 
    if ($File -ne $Null) { 
        write-host "Deleting File --> $File" -ForegroundColor "Green" 
        Remove-Item $File.FullName | out-null 
    }
}

Answer 1

Cart.create!(user_id: params[:id])看起来很奇怪。我认为它应该是Cart.create!(user_id: current_user.id)或current_user.create_cart。更多的是你必须改变你的代码。我建议：

def show
  setup_cart
end



def create
  setup_cart
  # ... your code
end

protected

def setup_cart
  # user logged in
  if current_user
    # when cart purchased reset existing one
    if current_user.cart.purchased_at
       session[:cart_id] = nil
       current_user.cart = nil       
    end 

    # use existing one, marked in session or create a new one 
    @cart = current_user.cart || Cart.where(id: session[:cart_id]).first || current_user.create_cart
    @cart.user = current_user # in case first login
    @cart.save!
  else # no user logged in
    @cart = Cart.where(id: session[:cart_id]).first || Cart.create! 
  end

  session[:cart_id] = @cart.id
end

Rails购物车删除自己

1 个答案: