小编Prz*_*903的帖子

我有以下show-view,其中我显示有关产品的基本信息并显示其他用户的产品.

<h1>Book <%= @product.name %></h1>
<% @products.each do |product| %>
<ul>
    <%= product.name %>
    <%= link_to "Make offer", {controller: "offers", :action => 'create', id: product.id }    %>
</ul>

调节器

def show
    @product = current_user.products.find(params[:id])
    @products = Product.all
end

我的目标是在两种产品之间提供优惠.我创建了Offer模型和制作优惠的方法:

class Offer < ActiveRecord::Base
  belongs_to :product

  belongs_to :exchanger, class_name: "Product", foreign_key: "exchanger_id" 

  validates :product_id, :exchanger_id, presence: true

  def self.request(product, exchanger)
    unless product == exchanger or Offer.exists?(product, exchanger)
    transaction do
      create(product: product, exchanger: exchanger, status: "oczekujace")
      create(product: exchanger, exchanger: product, status: "oferta") …