Rails的accepts_nested_attributes_for验证错误

Question

型号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 

型号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 

我有保存对象搭在操作创建一个问题。有错误：

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

目的地地址必须存在。当我在ride.save之前放置断点时，骑行看起来像：

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

错误的原因是什么？为什么需要start_address和destination_address？它是由关联has_one引起的吗？如何解决问题？ 在此先感谢。

Answer 1

尝试为关联添加inverse_of属性。

请记住，rails 5使默认情况下所需的belongs_to关联。

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