Question

我有以下型号：

product.rb

class Product

has_many :purchases
has_many :line_items
has_many :orders, :through => :order_products

lineitem.rb

class LineItem

belongs_to :product
belongs_to :cart
belongs_to: order

order.rb

class Order

belongs_to :user
belongs_to :product
has_many :purchases
has_many :line_items, :dependent => :destroy
has_many :orders, :through => :order_products

purchase.rb

class Purchase

belongs_to :order
belongs_to :product

更新

order_product.rb

class OrderProduct < ActiveRecord::Base
    belongs_to :order
    belongs_to :product
end

order_controller.rb

if @order.save

  if @order.purchase
    Cart.destroy(session[:cart_id])
    session[:cart_id] = nil

以上是我对模特的联想。但是，我在向用户显示产品时遇到问题。成功购买商品后，line_items将被销毁。

有谁知道我如何将所有购买的商品存入购买或任何其他更好的方法让我显示用户购买的产品？

我最初尝试检索line_items并且它有效。但是，在line_items被销毁后，我无法检索相关产品。

在此感谢任何帮助。

Answer 1

您需要查看http://guides.rubyonrails.org/association_basics.html#the-has-many-through-association关联。

 User
   has_many :orders
   has_many :products, through: :orders

 Order
   has_many :line_items
   has_many :products, through: :line_items

Answer 2

您可以尝试为每个用户制作order_history -

user.rb

def order_history
  #set this up according to how your models are related, etc  
  #with the idea being to call @user.order_history and getting an array of previous orders  
end

然后在order_controller.rb

if @order.save

      if @order.purchase
        #adapt this pseudocode to suit your needs and 
        #according to how you've defined `@user.order_history
        current_user.order_history = current_user.order_history + @order.line_items
        Cart.destroy(session[:cart_id])
        session[:cart_id] = nil

基本上，将line_items推到别处，以便在销毁购物车之前记录它们。

无法显示用户的订购商品

2 个答案: