使用散列键和值

我有一个模型QuizAttempt将要检查测验的结果。我正在寻找循环通过每个提交的答案，并检查问题ID，如果提供的答案是正确的。我在找一些指导，请...使用散列键和值

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，从形式返回了单选按钮

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

但是，当我像在上面的QuizAttempt模型中那样遍历它们。 submitted_answers.each do | answer |我得到的回答==

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

而且我想不过来检查以下

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

来源

2012-02-29 Norto23

基于问题的模型这些问题的答案，如果你改变了形式结构化的方式就会简单得多。

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

会给你3给你的榜样[ “question_1”，{ “ANSWER_3”=> “5”}]，然后您可以比较的问题模型correct_answer_number。

我不确定与“answer_x”关联的值是什么？我推测这不是答案（如1,2,3或4），因为它是5，而你只有4个可能的答案，所以我推测5是问题的实际答案并忽略它。

来源

2012-02-29 01:47:51

使用散列键和值

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