Question

目前在后台（REST Client）从此外部API获取一些项目（DelayedJob），然后将它们保存到数据库中。计划是使用Rails路由检查项目是否已保存到数据库，即。什么时候开始通过Ajax拉入它们是安全的。

但我的check_items_loaded路线出了什么问题？我以为它应该寻找url，而不是id？

Started GET "/check_items_loaded" 2015-06-06 00:43:03 +0000
Processing by MainController#check_items_loaded as */*
  Affiliate Load (0.4ms)  SELECT  "affiliates".* FROM "affiliates" WHERE "affiliates"."id" = ? LIMIT 1  [["id", nil]]
Completed 404 Not Found in 52ms

ActiveRecord::RecordNotFound (Couldn't find Affiliate with 'id'=):
  app/controllers/main_controller.rb:8:in `check_items_loaded'

您可以即时投放的实时应用：http://runnable.com/VXIdQ6KuRrYPdhKs/rest-client-ajax

的routes.rb

get '/check_items_loaded', to: 'main#check_items_loaded', as: :check_items_loaded

main_controller.rb

class MainController < ApplicationController
  def index
    # Delay fetching
    @products = Affiliate.delay.fetch
  end

  def check_items_loaded
    @items_status = Affiliate.find(params[:url])
    respond_to do |wants|
      wants.js
    end
  end
end

affiliate.rb

require "rest_client"

class Affiliate < ActiveRecord::Base
  def self.fetch
    response = RestClient::Request.execute(
      :method => :get,
      :url => "http://api.shopstyle.com/api/v2/products?pid=uid7849-6112293-28&fts=women&offset=0&limit=10"
    )

    @products = JSON.parse(response)["products"].map do |product|
      product = OpenStruct.new(product)
      affiliate = Affiliate.find_or_create_by(:name => product.name, :url => product.url)
      affiliate.save
    end
  end
end

20150604213141_add_items_to_affiliates.rb

class AddItemsToAffiliates < ActiveRecord::Migration
  def self.up
    change_table(:affiliates) do |t|
      t.string :name
      t.string :url
    end
  end
end

Answer 1

当您运行#find(foo)时，无论如何，ActiveRecord都会将foo中存储的值视为id列。为了搜索匹配的url参数，您实际需要的是Affiliate.find(params[:url])而不是Affiliate.where(url: params[:url])。

无法通过路线查找商品 - 无法找到'id'=

1 个答案: