Question

我有模型anwer_pair.rb

class AnswerPair
  include Mongoid::Document

  embedded_in :question
  embedded_in :survey
  field :answer1, type: String
  field :answer2, type: String
  ...
  field :correct, type: Boolean, default: true
  ...
  def new(answer1 = "answer1", answer2 = "answer2", correct = false)
    @answer1 = answer1
    @answer2 = answer2
    @correct = correct
  end
  ...
end

嵌套在question.rb

中

class Question
  include Mongoid::Document
  ...
  field :name, type: String
  ...
  embeds_many :answer_pairs
  accepts_nested_attributes_for :answer_pairs, allow_destroy: true
  ...
end

使用表单将问题保存到数据库工作正常（我使用mongoid）。现在，我想在更新或创建问题之前为问题添加更多答案对。出于这个原因，我在＆＃34;更新＆＃34;中调用了以下方法。和＆＃34;创造＆＃34;在questions_controller.rb中

 class QuestionsController < ApplicationController
 ...
 def update
   ...
   fill_up_answer_pairs(@question)
   ...
 end

 def create
    ...
    fill_up_answer_pairs(@question)
    ...
 end
 ...
 def fill_up_answer_pairs(question)
    if(question.answer_pairs.any?)
      question.answer_pairs.where(correct: false) do |pair|
        pair.delete
      end
      question.answer_pairs.where(correct: true) do |pair1|
        question.answer_pairs.where(correct: true) do |pair2|
          if(pair1.answer1 != pair2.answer1 && pair1.answer2 != pair2.answer2) 
            question.add_to_set(:answer_pairs, AnswerPair.new(pair1.answer1, pair2.answer2, false)) 
          end
        end
      end 
      # having "question.update_attributes(question.answer_pairs)" here would cause a "NameError ... undefined method `keys' for #<Array ..."
    end
  end

但它不会保存添加的答案对。我究竟做错了什么？任何帮助表示赞赏！

Answer 1

以下更改修复了问题：在where子句之后我忘了＆＃34;每个＆＃34; s我将answer_pair.rb的新方法更改为

def self.buildnew(answer1 = "answer1", answer2 = "answer2", correct = false)
    ap = AnswerPair.new
    ap.answer1 = answer1
    ap.answer2 = answer2
    ap.correct = correct
    return ap
end

不需要使用question.update_attributes。

RoR，Mongoid：如何更新嵌套属性？

1 个答案: