使用散列鍵和值

Question

我有一個模型QuizAttempt將要檢查測驗的結果。我正在尋找循環通過每個提交的答案，並檢查問題ID，如果提供的答案是正確的。我在找一些指導，請...

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 

提交的答案是在（嵌套？）散列的形式，從形式返回了單選按鈕

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

但是，當我像在上面的QuizAttempt模型中那樣遍歷它們。 submitted_answers.each do | answer |我得到的回答==

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

而且我想不過來檢查以下

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

基於問題的模型這些問題的答案，如果你改變了形式結構化的方式就會簡單得多。

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

會給你3給你的榜樣[ 「question_1」，{ 「ANSWER_3」=> 「5」}]，然後您可以比較的問題模型correct_answer_number。

我不確定與「answer_x」關聯的值是什麼？我推測這不是答案（如1,2,3或4），因爲它是5，而你只有4個可能的答案，所以我推測5是問題的實際答案並忽略它。