How to continue a quiz with a collection of data e

I'm gonna go straight forward for this. This question is connected with my passed question, I will offer you the bounty within 3 days from now if you solved this problem.

What I want

After the user answered a quiz, the user can save it without submitting, so they can edit/continue later. Now, after they saved, how can I loop through the user's answer in the current loop of questions in a quiz? So that the user can edit or continue the quiz.

What I have

database:

quiz_result_of_user has 9 fields, ['id', 'quiz_id', 'user_id', 'question_id', 'answer', 'question_type', 'attempt_number', 'marks', 'grades']

This table saves all the user's answer so this serves as the history table of the user's quiz.

quizattempt_user has 3 fields, ['id', 'quiz_id', 'user_id']

This table saves all the user's attempt, so I can reference all the answer of the user where the id = attempt_number in the quiz_result_of_user table.

Controller - Update

$quiz = Quiz::with('multiple_choices.answers', 'true_false', 'short_answer', 'descriptions')->findOrFail($id);

$questions = collect($quiz->multiple_choices);
$questions = $questions->merge(collect($quiz->true_false));
$questions = $questions->merge(collect($quiz->short_answer));
$questions = $questions->merge(collect($quiz->descriptions));
$questions = $questions->sortBy('question_number');

Problem

I can now loop through the questions, and the answers of the user, but I can't figure out how can I put the user's answer because it is also a collection of data. Note: every quiz can have different types of question, multiple choice, true or false, and short answer/fill in the blank.

Based on what I understand of the table structure, we can create a dictionary of the user's answers keyed by the the question IDs, so we can easily look up the answer for each question. Here's a minimal implementation that we can expand on:

$questions = ... // see question description
$answers = QuizResults::where('quiz_id', $quiz->id)
    ->where('user_id', $userId)
    ->where('attempt_number', $attemptNumber)
    ->get()
    ->keyBy('question_id');

foreach ($questions as $question) 
{ 
    echo $question->question_number + ". " + $question->description; 

    if ($question is MultipleChoice) {
        foreach ($question->answers as $choice) { echo $choice; ... }
    } 

    echo 'Your answer: ' + $answers->get($question->id)->first()->answer; 
}

I'm not sure if the page uses Blade to generate the results. For clarity, this is written in plain PHP, but it should be easy to rewrite this for a Blade template.