这个问题问起来有点复杂，可能更难理解，所以我会尽力添加上下文来解释我的目标。
我的应用程序允许登录用户在汽车经销商的网站上运行网络抓取功能，并将其库存存储到数据库中。我想将运行刮削功能的用户的当前_user.id与它创建的帖子相关联。
首先，我生成了一个迁移，通过运行 rails g migration AddUserRefToVehicles user:references 然后，我在车辆模型中添加了一个用户关联
然后，我更新了vehiclescontroller中的创建操作
VehicleController调用一个“scrape”函数，该函数运行“vehicles_spider.rb”模型，创建帖子并将其保存到数据库中。
车辆_controller.rb：

class VehiclesController < ApplicationController
      before_action :authenticate_user!
      before_action :set_vehicle, only: %i[ show edit update destroy ]

      ...

      #Calls vehicles_spider.rb
      def scrape
        url = 'https://www.example.com/vehicles'
        response = VehiclesSpider.process(url)
        if response[:status] == :completed && response[:error].nil?
          flash.now[:notice] = "Successfully scraped url"
        else
          flash.now[:alert] = response[:error]
        end
      rescue StandardError => e
      flash.now[:alert] = "Error: #{e}"
      end

      def new
        @vehicle = Vehicle.new
      end

      def create
                   #This didn't work
        @vehicle = Vehicle.new(vehicle_params.merge(user_id: current_user.id))
      end

...

      private
        # Use callbacks to share common setup or constraints between actions.
        def set_vehicle
          @vehicle = Vehicle.find(params[:id])
        end

        # Only allow a list of trusted parameters through.
        def vehicle_params
          params.require(:vehicle).permit(:title, :stock_number, :exterior_color, 
              :interior_color, :transmission, :drivetrain, :price)
        end
    end

vehicle.rb

class Vehicle < ApplicationRecord
    belongs_to :user
end

车辆_spider.rb

class VehiclesSpider < Kimurai::Base

require 'nokogiri'
require 'httparty'
require 'byebug'
require 'watir'

  @name = 'vehicles_spider'
  @engine = :mechanize

  def self.process(url)
    @start_urls = [url]
    self.crawl!
  end

  def parse(response, url:, data: {})
    url = "https://www.example.com/new-vehicles/"

    { ... }

            pagination_vehicle_listings.each do |vehicle_listing|
                vehicle = {title: ...
                           price: ...
                           color: ...          
                                      }
                // This line is what creates a post and saves the scraped data to my database.
                  Vehicle.where(vehicle).first_or_create

                   { ... }
     end

schema.rb

ActiveRecord::Schema.define(version: 2021_07_14_104441) do

  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "users", force: :cascade do |t|
    t.string "email", default: "", null: false
    t.string "encrypted_password", default: "", null: false
    t.string "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.string "name"
    t.index ["email"], name: "index_users_on_email", unique: true
    t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
  end

  create_table "vehicles", force: :cascade do |t|
    t.string "title"
    t.string "stock_number"
    t.string "exterior_color"
    t.string "interior_color"
    t.string "transmission"
    t.string "drivetrain"
    t.integer "price"
    t.integer "miles"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.bigint "user_id", null: false
    t.index ["user_id"], name: "index_vehicles_on_user_id"
  end

  add_foreign_key "vehicles", "users"
end

在我将“车辆”与“用户”关联之前，该程序一直在保存帖子，而现在，被刮取的数据拒绝保存。我的直觉是，由“vehicle_spider.rb”模型arn创建的车辆帖子与登录用户没有关联。