Question

将桌子连接到购物车

我有三个模型和三个数据库表，我想连接到一个购物车，我是新的rails并且有一些问题要做到这一点。我最初的想法是创建名为Service的模型作为模型Adverts，Package_of_products和Subscriptions的父模型。然后通过Line_item将其连接到购物车已经知道我做错了什么每次尝试将我的一项服务添加到Line_items时，我都会收到消息

ActiveRecord::RecordNotFound in LineItemsController#create

Couldn't find Service without an ID

app/controllers/line_items_controller.rb:44:in `create'

我已经

了

def create
  @cart = current_cart
  service = Service.find(params[:service_id])
  @line_item = @cart.line_items.build(:service => service)

respond_to do |format|
  if @line_item.save
    format.html { redirect_to(@line_item.cart, :notice => 'Line item was successfully created.')   
end

我有4个数据库并为我的Line_items建模

class LineItem < ActiveRecord::Base
belongs_to :service
belongs_to :cart
end

车

class Cart < ActiveRecord::Base
has_many :line_items, :dependent => :destroy
has_many :services,
has_many :adverts, :through => :services
has_many :package_of_products, :through => :services
has_many :subscriptions,:through => :services

class Advert < ActiveRecord::Base
  belongs_to :service
end

class Subscription < ActiveRecord::Base
  belongs_to :service
end

Package_of_products

class PackageOfProduct < ActiveRecord::Base
  belongs_to :service
end

Answer 1

好的，首先关联名称是belongs_to而不是belong_to，所以请更正错误打印。

然后我认为你需要这样的smth：

class Cart  < ActiveRecord ::Base
  has_many :line_items, :dependant => destroy
  has_many :ads, :through => :line_items
  has_many :products, :through => :line_items
  has_many :services, :through => :line_items
end

检查has_many :through关联here

将表连接到购物车

1 个答案: