Rails accepts_nested_attributes_for驗證錯誤

Question

模型ride.rb

class Ride < ActiveRecord::Base
..
has_one :start_address, class_name: "Address"
has_one :destination_address, class_name: "Address"

accepts_nested_attributes_for :start_address, :destination_address
..
end

型號address.rb

class Address < ActiveRecord::Base
  belongs_to :ride
end

rides_controller.rb

class RidesController < ApplicationController
  before_action :authenticate_user!
  before_action :set_providers, only: [:new, :create]
  expose :rides
  expose :ride, attributes: :ride_params
  def index
  end

  def new
    @start_address = ride.build_start_address
    @destination_address = ride.build_destination_address
  end

  def create
    ride.user = current_user
    if ride.save
      redirect_to root_path, notice: I18n.t('shared.created', resource: 'Ride')
    else
      render :new
    end
  end

  private
  def ride_params
    params.require(:ride).permit(:price, :provider_id,
        start_address_attributes: [:street, :city, :country],
        destination_address_attributes: [:street, :city, :country])
  end

  def set_providers
    @providers = Provider.all
  end
end

我在保存創建動作中保存對象時遇到問題。 有錯誤：

ActiveRecord::RecordInvalid: Validation failed: Start address ride must exist, 

目的地址必須存在。 當我在ride.save之前設置斷點時，ride看起來像：

#<Ride id: nil, price: 12.0, distance: 5.8, created_at: nil, updated_at: nil, user_id: 1, provider_id: 1>

錯誤原因是什么？ 為什么需要start_address和destination_address？ 是由關聯has_one引起的嗎？ 如何解決問題？ 提前致謝。

Answer 1

嘗試將inverse_of屬性添加到關聯中。

請記住，默認情況下，rails 5會要求屬下關聯。

http://blog.bigbinary.com/2016/02/15/rails-5-makes-belong-to-association-required-by-default.html