我作为路由参数传递的模型未被读取 (Laravel)

Question

在我的应用程序中，求职者复习考试后，会创建一个新的 jobseekerExamReview 实例并将其存储到 $examReview 变量以存储他们的分数。然后他们被重定向到一个显示上述考试复习结果的新页面，所以我将 $examReview 作为参数传递给结果路由。 id 显示在 link 中并且有效，但考试的内容不会显示，因为值显然为空。我检查了新记录的所有列，它们都有数据。当我最终在 $examReview 上执行 dd 时，它 returns 是空的。

$examReview（控制器）的值：

// create new Exam review session
$examReview = jobseekerExamReview::create([
    'jobseeker_id' => $jobseeker->id,
    'exam_id' => $exam_id
    //upon creation 'results' are set to 0 at default and updated later after score calculation (see full code)
]);

在控制器中重定向：

// return view to review results with answered and correct
return redirect()->route('showResults', [$examReview]);

web.php

Route::get('/exam/reviewExam/results/{jobseekerExamReview:id}', [reviewExamController::class, 'showResults'])
    ->middleware(['auth','verified'])
    ->name('showResults');

控制器中的完整代码：

public function calculateResult()
{
    // get needed details
    $jobseeker = Jobseeker::findorFail(auth()->user()->id);
    $exam_id = request()->input('exam_id');
    $jobApplication = jobApplication::find(session('jobApplicationId'));
    $correctAnswers = 0;

    // create new Exam review session
    $examReview = jobseekerExamReview::create([
        'jobseeker_id' => $jobseeker->id,
        'exam_id' => $exam_id
    ]);

    // loop through each question taken by user
    foreach(request()->input('taken_questions') as $key => $question_id){
        // is answer correct or not
        // echo "<br>Question ID: ".$question_id;
        $status = 0;
        //answer[questionID] => answer_id
        // if the answer[questionID] is not emptu and matched answer ID is correct
        // echo "<br>Answer ID:".request()->input('answer.'.$question_id);
        if((request()->input('answer.'.$question_id) != null) && (examAnswer::find(request()->input('answer.'.$question_id))->isCorrect == true)){
            // answer is correct
            // echo "is Correct";
            $status = 1;
            $correctAnswers++;

            // create review Exam Answers
            jobseekerExamReviewAnswer::create([
                'exam_review_id' => $examReview->id,
                'question_id' => $question_id,
                'answer_id' => request()->input('answer.'.$question_id),
                'isCorrect' => $status
            ]);

        }
    }

    // calculate score
    $percentScore = $correctAnswers/count(request()->input('taken_questions'))*100;
    // update score in review
    $examReview->update(['result' => $percentScore]);
    // return view to review results with answered and correct
    return redirect()->route('showResults',[$examReview]);
}

public function showResults(jobseekerExamReview $examReview)
{
    return view('exams.exam-review-results',[
        'examReview' => $examReview
    ])->with('reviewExamAnswers');
}

Answer 1

您的方法签名（路由操作）中的类型提示变量名称必须与路由定义中的路由参数名称相匹配。您的路由参数名为 jobseekerExamReview，但您的控制器方法的参数名为 jobseeker，这不匹配。因此，您将获得一个新的不存在的 jobseekerExamReview 实例注入（依赖注入）而不是路由模型绑定。您应该调整路由参数以匹配：

Route::get('/exam/reviewExam/results/{examReview:id}', ...);

这会导致隐式路由模型绑定发生，而不是依赖注入。

"Laravel automatically resolves Eloquent models defined in routes or controller actions whose type-hinted variable names match a route segment name."

Laravel 8.x Docs - Routing - Route Model Binding - Implicit Binding

作为旁注，在将参数传递给 URL 助手时，您应该养成使用关联数组的习惯，例如 route，因此它确切地知道您传递的是什么参数：

return redirect()->route('showResults', ['examReview' => $examReview]);

我作为路由参数传递的模型未被读取 (Laravel)

The model I passed as route parameter isn't being read (Laravel)

php

model-view-controller

routes

laravel

laravel-8