无法更新has_one关联的嵌套模型表单

Question

我尝试为has_one关联创建一个嵌套的模型表单.(我正在使用Rails 4)

在我的用户和地址模型中,我有以下内容:

class User < ActiveRecord::Base
 has_one :address
 accepts_nested_attributes_for :address
end

class Address < ActiveRecord::Base
 belongs_to :user

end

我的用户控制器:

class UsersController < ApplicationController
    .
    .
    .
    def edit
      @user = User.find(params[:id]) 
      @user.build_address if @user.address.nil?
    end 

    def update
      @user = User.find(params[:id])
      if @user.update(params.require(:user).permit(:user_name, address_attributes: [:street]))
        flash[:success] = "Profile updated successfully"
        sign_in @user
        redirect_to @user
      else
         flash.now[:error] = "Cannot updating your profile"
         render 'edit'
      end
    end
end

终于在我看来我有:

= form_for(@user) do |f|
  = render 'shared/error_messages', object: f.object
  %div
    = f.label :user_name, "User name"
    = f.text_field :user_name
    = f.fields_for :address do |add|
      = addd.label :street
      = d.text_field :street
    = f.submit "Update"

当我第一次尝试填充街道时,它可以工作,但是当我尝试更新时,我得到了错误:Failed to remove the existing associated address. The record failed to save after its foreign key was set to nil

任何想法错误在哪里？谢谢

Answer 1

如果记录已存在,可以选择进行部分更新:

accepts_nested_attributes_for(:address, update_only: true)

记录在这里:http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for

Answer 2

在您的控制器中UsersController,在update方法中,添加address: :id到允许的地址属性.像这样:

params.require(:user).permit(:user_name, address_attributes: [:id, :street]))