显示每个用户的总答案和正确答案

Question

我有这样的数据库结构：

表：

users(id, email, password, ...) //default laravel users table

examinees(id, user_id, ...)

exam_quizzes(id, title, explanation)

exam_quiz_answers(id, title, exam_quiz_id, is_correct_ans)

submitted_answers(id, user_id, exam_quiz_id, exam_quiz_answer_id)

我已经设置了相应的模型和关系方法。

型号：

User, Examinee, ExamQuiz, ExamQuizAnswer, SubmittedAnswer

关系：

// User -> hasOne() -> Examinee
$user->examinee
// ExamQuiz -> hasMany() -> ExamQuizAnswer 
$examQuiz->examQuizAnswers
// SubmittedAnswer -> hasMany() -> ExamQuiz
$submittedAnswer->examQuizzes 
// SubmittedAnswer -> hasMany() -> ExamQuizAnswer
$submittedAnswer->examQuizAnswers 
// User -> hasMany() -> SubmittedAnswer
$user->submittedAnswers

在我看来，如何显示姓名、总回答和总正确 对于同时也是考生的每个用户，在 table 中是这样的：

<tr>
    <th>Name</th>
    <th>Answered</th>
    <th>Correct</th>
</tr>
@foreach()
{{-- I have no idea what to do here --}}
  <tr>
      <td></td>
      <td></td>
      <td></td>
  </tr>
@endforeach

Answer 1

循环您的 $users 并回显您想要的 3 个字段。大致是这样的：

{{ $user->name }}
{{ $user->submittedAnswers->examQuizAnswers()->where('is_correct_answer', 1)->get()->count() }}
{{ $user->submittedAnswers->examQuizAnswers->count() }}

但是为了 children.

请不要实际查询视图文件

在您的控制器中预先加载相关模型：

User::with(['submitted_answers', 'submitted_answers.exam_quiz_answers'])->get()

Answer 2

在你的控制器中，你让用户通过它来查看。

$users = User:get();

并创建一个 foreach 循环来获取答案和正确答案：

<tr>
    <th>Name</th>
    <th>Answered</th>
    <th>Correct</th>
</tr>
@foreach($users as $user)
  <tr>
      <td>{{$user->name}}</td>
      <td>{{count($user->submittedAnswers()->get())}}</td>
       @php 
        foreach($user->submittedAnswers()->get() as $answer){
         foreach($answer->examQuizAnswers->get() as $quiz){
           $count = $quiz->where('is_correct_answer',1)->count()
        }
      }
     @endphp
      <td>{{$count}}</td>
  </tr>
@endforeach

但是您当然可以在模型中编写一个方法来检索正确答案。而只是调用该方法。您可以在用户模型中编写这样的方法：

public function get_correct_answers($user_id){

      $user = User::whereId($user_id)->first();
        foreach($user->submittedAnswers()->get() as $answer){
         foreach($answer->examQuizAnswers->get() as $quiz){
           $count = $quiz->where('is_correct_answer',1)->count()
        }
      }
return $count;
}

然后在视图中，您只需像这样调用该方法：

 <tr>
        <th>Name</th>
        <th>Answered</th>
        <th>Correct</th>
    </tr>
    @foreach($users as $user)
      <tr>
          <td>{{$user->name}}</td>
          <td>{{count($user->submittedAnswers()->get())}}</td>
          <td>{{$user->get_correct_answers($user->id)}}</td>
      </tr>
    @endforeach

显示每个用户的总答案和正确答案

Displaying total answer and correct answer of each user

php

sql

laravel

eloquent

blade