Question

编辑：这是错误的原因是因为即使它与submitted_answer匹配，我也会继续迭代第一个answer。不过，我仍然不知道如何解决这个问题。

这表明多项选择测验中用户的哪些答案是正确的还是错误的。 @quiz此处指的是has_many Questions which has_many Answers. @submitted_quiz refers to the model已提交测验, which has_many submitted_answers . My plan is to compare submitted_answers to the actual answers (found by @ quiz的用户模型测验.question.answer），并向用户显示他们错误或正确的答案。这是代码：

  <% @quiz.questions.each do |question| %>
  <li> <%= question.content  %> </li>


    <% question.answers.each do |answer| %>
    <% @submitted_quiz.submitted_answers.each do |submitted_answer| %>

    <% if(submitted_answer.content == answer.content && submitted_answer.question.id == answer.question.id && submitted_answer.got_correct) %>
    <li><span class ='correct-answer'><%= answer.content %> CORRECT </span></li>
    <% break %>

    <% elsif(submitted_answer.content == answer.content && submitted_answer.question.id == answer.question.id && submitted_answer.got_incorrect) %>
    <li><span class ='incorrect-answer'><%= answer.content %> INCORRECT</span></li>
    <% break %>

    <% else %>
    <li><span class ='normal-answer'> <%= answer.content %> NORMAL</span></li>
    <% break %>

    <% end #  if statement%>

    <% end # submitted_answers.each do%>

    <% end # question.answers.each do |answer|%>

    <% end # @quiz.questions.each do %>
</ol>

这适用于question的第一个quiz.questions。正确标记正确答案并正确标记错误答案。但是，在第二个（以及之后的每个问题）上没有任何标记正确或不正确。例如，如果正常输出应该是（用户得到两个问题）：

Q1
Answer 1 CORRECT
Answer 2 NORMAL
Answer 3 NORMAL
Answer 4 NORMAL
Q2
Answer 1 CORRECT 
Answer 2 NORMAL
Answer 3 NORMAL
Answer 4 NORMAL

实际输出为：

Q1
Answer 1 CORRECT
Answer 2 NORMAL
Answer 3 NORMAL
Answer 4 NORMAL
Q2
Answer 1 NORMAL  
Answer 2 NORMAL
Answer 3 NORMAL
Answer 4 NORMAL

如果我删除else语句，输出就会成为我的期望：

Q1
Answer 1 CORRECT

Q2
Answer 1 CORRECT.

但后来我无法在每个问题中显示所有答案。

我已经被困在这一天了。为什么会这样？

Answer 1

尝试这样的事情：

<% @quiz.questions.each do |question| %>
  <li> <%= question.content %> </li>

  # In submitted quiz table, every submission must store question and answer ids.
  <% submitted_answer = @submitted_quiz.submitted_answers.find_by(question_id: question.id) %>

  # Every question record stores answer ids along with correct_answer id.
  <% correct_answer_id = question.correct_answer %>

  <% question.answers.each do |answer| %>
    <% if answer.id == submitted_answer.answer_id && answer.id == correct_answer_id %>
      <li><span class ='correct-answer'><%= answer.content %> CORRECT </span></li>
    <% elsif answer.id == submitted_answer.answer_id && answer.id != correct_answer_id %>
      <li><span class ='incorrect-answer'><%= answer.content %> INCORRECT</span></li>
    <% else %>
      <li><span class ='normal-answer'> <%= answer.content %> NORMAL</span></li>
    <% end %>
  <% end %>

<% end %>

为什么我的循环只能在第一次迭代中正常工作？

1 个答案: