Rails 5 中具有多态关联的嵌套属性

我创建了一个Address具有多态关联的模型，我试图通过客户端模型的嵌套属性保存到它，但我得到Address addressable must exist in the @client.errors.

Models:

class Client < ApplicationRecord
  has_one :address, as: :addressable, dependent: :destroy
  accepts_nested_attributes_for :address, :allow_destroy => true
end

class Address < ApplicationRecord
  belongs_to :addressable, polymorphic: true
end

控制器：

class ClientsController < ApplicationController

  def new
    @client = Client.new
    @client.create_address
  end

  def create
    @client = Client.new(client_params)

    if @client.save
      ...
    else
      ...
    end
  end

  private
  def client_params
    params.require(:client).permit(:first_name ,:last_name, :company, address_attributes: [:line1, :line2, :line3, :city, :state_province, :postal_code, :country])
  end    
end

您应该添加inverse_of https://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#module-ActiveRecord::Associations::ClassMethods-label-Setting+Inverses关键在你的belongs_to关系，例如在你的Address class:

class Address < ApplicationRecord
  belongs_to :addressable, polymorphic: true, inverse_of: :addressable
end

这将正确保存嵌套地址，因为 Rails 现在将正确知道要在addressable.

不要使用optional键，除非addressable确实是可选的。