如何从多对多字段中获取相关对象

Question

我正在尝试从多对多字段中获取对象。当用户选择他们的答案时，我希望能够从 MtoM field.Then 中获取相关对象，增加相关对象 ansData + 1。模型中的 ans 是另外一回事，但出于某些原因我更改了它，但这就是我所做的我正在尝试增加。

models.py

    class User(models.Model):
    first_name = models.CharField(max_length=25)
    last_name = models.CharField(max_length=25)
    #password = models.CharField(max_length=25)
    email = models.EmailField(max_length=100)

class Quiz(models.Model):
    name = models.CharField(max_length=200,primary_key=True)
    NOQ = models.IntegerField(default=1)
    
   
    

    class Meta:
        verbose_name = "Quiz"
        verbose_name_plural = "Quizzes"
    
    def __str__(self):
        return self.name
    #number Of Questions
class Major(models.Model):  
    major = models.CharField(max_length=200)
    ans = models.IntegerField(default=0)
    answer = models.ManyToManyField('Answer')
    def __str__(self):
        return self.major

class Question(models.Model):
    question_text = models.CharField(max_length=400)
    quiz = models.ForeignKey("Quiz", on_delete=models.CASCADE, null=True)

    def __str__(self):
        return self.question_text


class Answer(models.Model):
    question = models.ForeignKey('Question', on_delete=models.CASCADE, null=True)
    answer_text = models.CharField(max_length=200)


    def __str__(self):
         return self.answer_text

class QuizTaker(models.Model):
    user = models.ForeignKey("User", on_delete=models.CASCADE)
    quiz = models.ForeignKey("Quiz", on_delete=models.CASCADE)
    completed = models.BooleanField(default=False)

    def __str__(self):
        return self.user

views.py

    class QuizView(DetailView):
    model = Question
    template_name = 'Quizzes/quiz.html'
    
 
   
    
    
class ResultsView(generic.DetailView):
    model = Question
    template_name = 'JSUMA/results.html'
    

def vote(request, question_id):
    question = get_object_or_404(Question, question_id)
    try:
        selected_answer = question.answer_set.get(pk=request.POST['answer'])
        except (KeyError,Answer.DoesNotExist):
            return render(request, 'Quizzes/quiz.html,' {'question' : question,
            'error_message' : "You didn't select an answer.",})
        else:

Answer 1

这与显示投票应用程序的官方 Django 教程非常相似。推荐大家仔细看看
休息，你应该为每个答案添加一个投票数整数字段。
selected_answer = Answer.objects.get(pk=request.POST['answer'])
现在只需增加对该答案的投票。

如何从多对多字段中获取相关对象

how to get related objects from a many to many field

python

django

many-to-many