嵌套表单更新操作产生重复结果

在嵌套表单的更新操作期间，它似乎创建了新的嵌套记录，而不是更新当前嵌套的记录。

这就是我的控制器的样子：

class ApplicationsController  "You have now applied!" end def edit @application = Application.find(params[:id]) @answers = [] @job.questions.each do |question| @application.answers.each do |answer| @answers < "You have updated your application!" end def destroy Application.find(params[:id]).destroy flash[:success] = "Application Deleted." redirect_to root_url end def show @application = Application.find(params[:id]) @answers = [] @job.questions.each do |question| @application.answers.each do |answer| @answers << answer if answer.question_id == question.id end end end private def set_user_and_job @user = current_user @job = Job.find(params[:job_id]) end def application_params params.require(:application).permit(:job_id, :user_id, answers_attributes:[:question_id, :content]).merge(user_id: current_user.id, job_id: params[:job_id]) end end 

这就是我的编辑视图：

  
 
 
 Job: 
 
  
 
 
 
 Applicant: 
 
 
 
Edit your job application below.
 
 
       "" %>  question.id %>     

应用程序模型本身：

 # == Schema Information # # Table name: applications # # id :integer not null, primary key # user_id :integer # job_id :integer # created_at :datetime # updated_at :datetime # class Application  lambda { |a| a[:content].blank? }, :allow_destroy => true def self.build(job_id) application = self.new job = Job.find(job_id) job.questions.count.times do application.answers.build end application end end 

答案模型：

 # == Schema Information # # Table name: answers # # id :integer not null, primary key # application_id :integer # question_id :integer # created_at :datetime # updated_at :datetime # content :string(255) # class Answer < ActiveRecord::Base belongs_to :question belongs_to :application validates :content, presence: true end 

从搜索，我发现这个链接， RoR嵌套属性在编辑时产生重复 ，这表明我将：id添加到application_params，但是当我这样做时，我得到了错误

 ActiveRecord::RecordNotFound in ApplicationsController#update Couldn't find Answer with ID=5 for Application with ID=17 

（这也有点奇怪，因为答案的实际ID是39. 5实际上是问题的ID：S）

你对此有何看法？ SO的导师，非常感谢:)

Answer 1

update_only不适用于has_many关系。 您需要将嵌套属性：id字段添加到您的强参数：

 def application_params params.require(:application).permit(:job_id, :user_id, answers_attributes:[:id, :question_id, :content]).merge(user_id: current_user.id, job_id: params[:job_id]) end 

Answer 2

尝试将update_only添加到您对accepts_nested_attributes_for的调用中。

 accepts_nested_attributes_for :nested_attribute, update_only: true