如何使用ModelChoiceField在django中组织测验？

from django.db import models

class Question(models.Model):
    question_text = models.CharField(max_length=200)

class Choice(models.Model):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    is_correct = models.BooleanField(default=False)

from django import forms
from .models import Question

class QuizForm(forms.Form):
    def __init__(self, *args, **kwargs):
        super(QuizForm, self).__init__(*args, **kwargs)
        questions = Question.objects.all()
        for question in questions:
            choices = question.choice_set.all()
            choices_list = [(choice.id, choice.choice_text) for choice in choices]
            self.fields[str(question.id)] = forms.ModelChoiceField(
                queryset=choices,
                widget=forms.RadioSelect,
                empty_label=None,
                label=question.question_text,
                choices=choices_list
            )

from django.shortcuts import render
from .forms import QuizForm

def quiz_view(request):
    form = QuizForm()
    return render(request, 'quiz.html', {'form': form})

def quiz_submit(request):
    if request.method == 'POST':
        form = QuizForm(request.POST)
        if form.is_valid():
            score = 0
            for question_id, choice_id in form.cleaned_data.items():
                choice = Choice.objects.get(id=choice_id)
                if choice.is_correct:
                    score += 1
            return render(request, 'result.html', {'score': score})
    else:
        form = QuizForm()
    return render(request, 'quiz.html', {'form': form})