问如何从外键的反向验证对象

EN

# models.py

class Question(models.Model):
    text = models.Charfield()

class AnswerOption(models.Model):
    text = models.Charfield()
    question = models.ForeignKey(Question, on_delete=models.CASCADE, related_name="options")

# admin.py

from django.contrib import admin
from django.forms.models import BaseInlineFormSet

class AnswerOptionFormset(BaseInlineFormset):
    def clean(self):
        super().clean() # See note in docs about calling this to check unique constraints

        #self.instance -> Question, with all the newly submitted, and validated, data.
        #self.forms -> iterator over all the submitted AnswerOption forms
        #for f in self.forms:
        #    f.instance -> instance of AnswerOption containing the new validated data

        #Note: self.instance.options will refer to the previous AnswerOptions

        #raise ValidationError for anything that is wrong.
        #It is also possible to modify the data in self.instance or form.instance instead.


class AnswerOptionInline(admin.TabularInline):
    formset = AnswerOptionFormset # note formset on AnswerOption NOT QuestionAdmin 


class QuestionAdmin(admin.ModelAdmin):
    inlines = [AnswerOptionInline]

# forms.py 

from django import forms
from .models import Question

class QuestionForm(forms.Form):
    text = models.Charfield()

    class Meta:
        model = Question

    def clean(self):
        options = self.cleaned_data['options']
        if not option.are_ok:
          raise forms.ValidationError

# admin.py

from django import admin
from .forms import QuestionForm


class QuestionAdmin(admin.ModelAdmin):
    form = QuestionForm

...