django/tests/prefetch_related/test_uuid.py

from django.test import TestCase

from .models import Flea, House, Person, Pet, Room


class UUIDPrefetchRelated(TestCase):
    def test_prefetch_related_from_uuid_model(self):
        Pet.objects.create(name="Fifi").people.add(
            Person.objects.create(name="Ellen"),
            Person.objects.create(name="George"),
        )

        with self.assertNumQueries(2):
            pet = Pet.objects.prefetch_related("people").get(name="Fifi")
        with self.assertNumQueries(0):
            self.assertEqual(2, len(pet.people.all()))

    def test_prefetch_related_to_uuid_model(self):
        Person.objects.create(name="Bella").pets.add(
            Pet.objects.create(name="Socks"),
            Pet.objects.create(name="Coffee"),
        )

        with self.assertNumQueries(2):
            person = Person.objects.prefetch_related("pets").get(name="Bella")
        with self.assertNumQueries(0):
            self.assertEqual(2, len(person.pets.all()))

    def test_prefetch_related_from_uuid_model_to_uuid_model(self):
        fleas = [Flea.objects.create() for i in range(3)]
        Pet.objects.create(name="Fifi").fleas_hosted.add(*fleas)
        Pet.objects.create(name="Bobo").fleas_hosted.add(*fleas)

        with self.assertNumQueries(2):
            pet = Pet.objects.prefetch_related("fleas_hosted").get(name="Fifi")
        with self.assertNumQueries(0):
            self.assertEqual(3, len(pet.fleas_hosted.all()))

        with self.assertNumQueries(2):
            flea = Flea.objects.prefetch_related("pets_visited").get(pk=fleas[0].pk)
        with self.assertNumQueries(0):
            self.assertEqual(2, len(flea.pets_visited.all()))

    def test_prefetch_related_from_uuid_model_to_uuid_model_with_values_flat(self):
        pet = Pet.objects.create(name="Fifi")
        pet.people.add(
            Person.objects.create(name="Ellen"),
            Person.objects.create(name="George"),
        )
        self.assertSequenceEqual(
            Pet.objects.prefetch_related("fleas_hosted").values_list("id", flat=True),
            [pet.id],
        )


class UUIDPrefetchRelatedLookups(TestCase):
    @classmethod
    def setUpTestData(cls):
        house = House.objects.create(name="Redwood", address="Arcata")
        room = Room.objects.create(name="Racoon", house=house)
        fleas = [Flea.objects.create(current_room=room) for i in range(3)]
        pet = Pet.objects.create(name="Spooky")
        pet.fleas_hosted.add(*fleas)
        person = Person.objects.create(name="Bob")
        person.houses.add(house)
        person.pets.add(pet)
        person.fleas_hosted.add(*fleas)

    def test_from_uuid_pk_lookup_uuid_pk_integer_pk(self):
        # From uuid-pk model, prefetch <uuid-pk model>.<integer-pk model>:
        with self.assertNumQueries(4):
            spooky = Pet.objects.prefetch_related(
                "fleas_hosted__current_room__house"
            ).get(name="Spooky")
        with self.assertNumQueries(0):
            self.assertEqual("Racoon", spooky.fleas_hosted.all()[0].current_room.name)

    def test_from_uuid_pk_lookup_integer_pk2_uuid_pk2(self):
        # From uuid-pk model, prefetch
        # <integer-pk model>.<integer-pk model>.<uuid-pk model>.<uuid-pk model>:
        with self.assertNumQueries(5):
            spooky = Pet.objects.prefetch_related("people__houses__rooms__fleas").get(
                name="Spooky"
            )
        with self.assertNumQueries(0):
            self.assertEqual(
                3,
                len(spooky.people.all()[0].houses.all()[0].rooms.all()[0].fleas.all()),
            )

    def test_from_integer_pk_lookup_uuid_pk_integer_pk(self):
        # From integer-pk model, prefetch <uuid-pk model>.<integer-pk model>:
        with self.assertNumQueries(3):
            racoon = Room.objects.prefetch_related("fleas__people_visited").get(
                name="Racoon"
            )
        with self.assertNumQueries(0):
            self.assertEqual("Bob", racoon.fleas.all()[0].people_visited.all()[0].name)

    def test_from_integer_pk_lookup_integer_pk_uuid_pk(self):
        # From integer-pk model, prefetch <integer-pk model>.<uuid-pk model>:
        with self.assertNumQueries(3):
            redwood = House.objects.prefetch_related("rooms__fleas").get(name="Redwood")
        with self.assertNumQueries(0):
            self.assertEqual(3, len(redwood.rooms.all()[0].fleas.all()))

    def test_from_integer_pk_lookup_integer_pk_uuid_pk_uuid_pk(self):
        # From integer-pk model, prefetch
        # <integer-pk model>.<uuid-pk model>.<uuid-pk model>:
        with self.assertNumQueries(4):
            redwood = House.objects.prefetch_related("rooms__fleas__pets_visited").get(
                name="Redwood"
            )
        with self.assertNumQueries(0):
            self.assertEqual(
                "Spooky",
                redwood.rooms.all()[0].fleas.all()[0].pets_visited.all()[0].name,
            )