from django.db import models
from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType


class Person(models.Model):
    name = models.CharField(max_length=100)
    creator = models.ForeignKey(User, models.CASCADE, null=True)
    ct = models.ForeignKey(ContentType, models.CASCADE)


def run():
    admin = User.objects.create(username='admin')
    person_ct = ContentType.objects.get_for_model(Person)
    Person.objects.create(creator=admin, name="Claude", ct=person_ct)
    # resolves correctly
    qs1 = Person.objects.all().values("creator__pk")
    print(qs1)
    
    alias = "myalias"
    # raises FieldError
    qs2 = Person.objects.annotate(**{alias: models.F("creator")}).values(alias + "__pk")
    print(qs2)
    # raises FieldError
    qs3 = Person.objects.annotate(
        **{alias: models.FilteredRelation("creator", condition=models.Q(creator__isnull=False))}
    ).values(alias + "__pk")
    print(qs3)