I currently have a model that looks like this

class modelStudent(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE,null=True, 
blank=True)
    school           = models.ForeignKey(modelSchool)

Now I also have a modelStudentAdmin of the above model which basically 
filters out the data seen by the user. The code looks like this

class modelStudentAdmin(admin.ModelAdmin):
    def get_queryset(self, request):
        qs = super(modelStudentAdmin, self).get_queryset(request)

        if request.user.is_superuser:
            return qs
        else:
            # Get the school instance
            schoolInstance = modelSchool.objects.get(user=request.user)
            qs = modelStudent.objects.filter(school=schoolInstance)
            return qs

admin.site.register(modelStudent,modelStudentAdmin)

now my question is in the admin when the user attempts to create a new 
modelStudent for the field "user" all available users are shown in the drop 
down. My question is if there is a way for me to limit/restrict that drop 
down to a certain value or (set that drop down value to something and then 
have the drop down disabled) ? I only want people creating 
modelStudentAdmin under their respective user field.



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