Ruby on rails 嵌套表单未知属性：问题\u id

我有两种型号：

class Question < ActiveRecord::Base
  has_many :answers, :dependent => :destroy
  accepts_nested_attributes_for :answers
end

class Answer < ActiveRecord::Base
  belongs_to :question
end

---

您似乎忘记在答案表中创建

问题id

字段

---

您的两个模型之间存在1-M关系

问答
。确保答案表中有外键
问题id
 您似乎忘记在答案表中创建问题id字段。您的两个模型之间存在1-M关系。确保答案表中有外文关键问题。你完全正确，谢谢。我刚刚添加了答案。：）
class QuestionsController < ApplicationController

  def new
    @question = Question.new  
    4.times { @question.answers.build }
  end

end

= simple_form_for @question do |f|
  = f.input :title
  = f.simple_fields_for :answers do |a|
    = a.input :text
  = f.submit