在Rails中同时保存两条记录，其中一条记录的foreign_key指向另一条记录

# app/models/user.rb
class User < ApplicationRecord
  has_many :orders
end

# app/models/order.rb
class Order < ApplicationRecord
  belongs_to :user
end

# app/controllers/orders_controller.rb
class OrdersController < ApplicationController
  def create
    user = User.create(user_params)
    order = user.orders.build(order_params)

    if user.save && order.save
      # 保存成功的处理逻辑
    else
      # 保存失败的处理逻辑
    end
  end

  private

  def user_params
    params.require(:user).permit(:name, :email)
  end

  def order_params
    params.require(:order).permit(:product_name, :price)
  end
end