Ruby on rails Rails：多层问题有很多未定义的方法

我得到了一个

未定义的方法“答案”

错误：

@survey.questions.answers

只要运行

@survey.questions

就可以了

以下是我的模型设置：

class Survey < ActiveRecord::Base
  has_many :questions

  accepts_nested_attributes_for :questions, :reject_if => lambda { |a| a[:text].blank? }, :allow_destroy => true
end

class Question < ActiveRecord::Base
  belongs_to :survey
  has_many :answers

  accepts_nested_attributes_for :answers, :reject_if => lambda { |a| a[:text].blank? }, :allow_destroy => true
end

class Answer < ActiveRecord::Base
  belongs_to :question
  has_many :responses
end

---

@survey.questions

是一组问题

尝试

@调查。问题。首先。答案

当然，在您看来，您可以：

<% @survey.questions.each do |question| %>
  <%= question.title %>
  <% question.answers.each do |answer| %>
    <%= answer.title %>
  <% end %>
<% end %>

<% @survey.questions.each do |question| %>
  <%= question.title %>
  <% question.answers.each do |answer| %>
    <%= answer.title %>
  <% end %>
<% end %>

@survey.questions.map(&:answers)