restrict django choice field on django admin per user

Question

I have an exam like this:

class Exam(BaseModel):
    ...
    STATE_CHOICES = (
        (PASS, PASS),
        (FAILED, FAILED),
        (GREAT, GREAT),
    state = models.CharField(max_length=15, choices=STATE_CHOICES, default=PASS)
    ...

Inside Django admin, I want the user with group X to be able to only change the state only from FAILED to PASS. and users with group Y be able to change the state from FAILED to PASS and PASS to GREAT. here is my admin.py:

@admin.register(Exam)
class ExamAdmin(NestedModelAdmin):
    list_display = ('state',)

Does anyone know a solution for it?

Answer 1

This might work;

class ExamForm(forms.ModelForm):
    ...
    STATE_CHOICES = (
        (PASS, PASS),
        (FAILED, FAILED),
        (GREAT, GREAT),
    state = forms.CharField(choices=STATE_CHOICES)
    class Meta:
        model = Exam
        fields = ('state',)
    ...

@admin.register(Exam)
class ExamModelAdmin(admin.ModelAdmin):
    ...
    fields = ('state',)
    list_display = ('state',)
    form = ExamForm
    ...

Sorry for giving you a bad example before, didn't have too much time.