Radio buttons in django admin

I am creating a quiz app in django. here is the model:

    class Quiz(models.Model):
        title = models.CharField(max_length=200)
        description = models.TextField()
        publish = models.BooleanField(default=False)

        def __unicode__(self):
            return self.title

    class Question(models.Model):
        quiz = models.ForeignKey(Quiz)
        question = models.TextField()
        hint = models.TextField()

        def __unicode__(self):
            return self.question

    class Option(models.Model):
        question = models.ForeignKey(Question)
        option = models.CharField(max_length=250)
        correct = models.BooleanField(default=False)

        def __unicode__(self):
            return self.title

Each question can only have one answer. This is where the problem comes in. I haven't been able to figure out how to write the admin form for Option model such that for each question, only one of the options can have correct=True.

I can use radio buttons for each question but don't know how to restrict them such that only one can be selected for one foreign key.

---

I'm not sure how that can be done with reverse look up.

I know this is not exactly what you want, but is quite close. Can you go ahead and try this in the admin.py

admin.site.register(Quiz)
#admin.site.register(Option) #Include this if required

class OptionInline(admin.TabularInline):
    model = Option

@admin.register(Question)
    class QuestionAdmin(admin.ModelAdmin):
    inlines = [
        OptionInline,
    ]

---

I understood your question like this: you want to change your code because only one option should be right. Why don't you add this line to Question:

right_answer = models.ForeignKey(Option)

Like this, you needn't the boolean correct . Your also could add a Manager to this who returns any option which should be chooseable (you override the method get_queryset() , and this manager should have this line at get_qeryset(): q.option_set.all() where q is there Question. (Without this any option, although its matched with another Question, could be marked.)

I'm not sure whether the secont part would work neither whether its a good way, but the first part is the important one.

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