验证Django Admin Inline Formset

Question

我需要验证内联formset具有唯一值。 这个想法是能够添加一个问题和多个答案的竞争。我们可以使用复选框标记正确的答案，但是我需要确保不会选择或保存多个复选框。 我已经尝试验证一个干净的（）在模型方面，也通过扩展BaseInlineFormSet，但我似乎很难迭代formset并获得任何值。

class Competition(models.Model): 

    title = models.CharField(max_length=255) 
    slug = models.SlugField(unique=True, blank=False) 
    content = models.TextField() 
    terms = models.TextField() 


class Question(models.Model): 
    competition = models.OneToOneField(
     Competition, 
     on_delete=models.CASCADE, 
     primary_key=True, 
    ) 
    question = models.CharField(max_length=255) 


class Answer(models.Model): 

    question = models.ForeignKey(Question) 
    answer = models.CharField(max_length=255) 
    is_correct = models.BooleanField(default=False) 

Answer 1

所以之后的睡眠我似乎已经设法解决它

from django.forms.models import BaseInlineFormSet 
from django.core.exceptions import ValidationError 

class AnswerInlineFormSet(BaseInlineFormSet): 

    def clean(self): 

     super(AnswerInlineFormSet, self).clean() 
     total_checked = 0 

     for form in self.forms: 
      if not form.is_valid(): 
       return 
      if form.cleaned_data and not form.cleaned_data.get('DELETE'): 
       if form.cleaned_data['is_correct']: 
        total_checked += 1 

     if total_checked > 1: 
      raise ValidationError("You cannot have more than one correct answer") 

     if total_checked < 1: 
      raise ValidationError("You must have at least one correct answer")