使用哈希键和值

Question

我有一个QuizAttempt模型，它将检查测验的结果。我希望循环浏览每个提交的答案，并检查问题id，如果提供的答案是正确的。我正在寻求一些指导，请。。。

class QuizAttempt < ActiveRecord::Base
  belongs_to :user
  belongs_to :quiz
  validates_presence_of :quiz, :user
  validate :check_result
  attr_accessor :questions, :submitted_answers
  private
  def self.create_for_user_and_answers!(user, answers)
    self.new(:user => user).tap do |q| 
      q.submitted_answers = answers
      q.questions = []
      answers.each{|k, v| q.questions = q.questions << Question.find(k.gsub(/[^0-9]/i, '').to_i) }
    end
  end
  def check_result
    if submitted_answers
      unless submitted_answers.keys.length == quiz.easy_questions + quiz.moderate_questions + quiz.hard_questions
        self.errors.add(:submitted_answers, "must be provided for each question")
      end
    else
      self.errors.add(:submitted_answers, "must be provided")
    end
    return false unless self.errors.empty?
    score = 0
    submitted_answers.each do |answer|
      #check the answers and score + 1 if correct
    end
    self.total_questions = submitted_answers.length
    self.passed_questions = score
    self.passed = percentage_score >= quiz.pass_percentage
  end
  public
  def percentage_score
    (passed_questions / total_questions.to_f * 100).to_i
  end
end

提交的答案采用（嵌套？）散列的形式，从带有单选按钮的表单返回

{"question_1"=>{"answer_3"=>"5"}, "question_2"=>{"answer_2"=>"4"}}

但是，当我像上面的QuizAttempt模型中那样循环它们时，即submitted_answers.eachdo|answer|I得到的答案==

["question_1", {"answer_3"=>"5"}]

我想根据下面的问题模型来检查这些答案

class Question < ActiveRecord::Base
  belongs_to :quiz
  validates :question, :presence => true, :length => {:minimum => 3, :maximum => 254}
  validates :answer_1, :answer_2, :answer_3, :answer_4, :presence => true, :length => {:maximum => 254}
  validates :rank, :presence => true, :numericality => { :only_integer => true, :greater_than => 0, :less_than => 4 }
  validate :only_one_answer_correct  
  #has boolean values answer_1_correct, answer_2_correct, answer_3_correct, answer_4_correct
  def correct_answer_number
    (1..4).each{|i| return i if send("answer_#{i}_correct")}
  end
end

Answer 1

如果您改变表单的结构方式，会简单得多。

answer[1].keys.first.sub("answer_", '').to_i

会给你3个例子["question_1"，{"answer_3"=>"5"}]，然后你可以将其与问题模型中的correct_answer_number进行比较。

我不确定与"answer_x"相关的值是多少？我认为这不是答案（如1,2,3或4），因为它是5，而你只有4个可能的答案，所以我认为5是这个问题的实际答案，并忽略了它。