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from django.test import TestCase
from .models import Organiser, Pool, PoolStyle, Tournament
class ExistingRelatedInstancesTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.t1 = Tournament.objects.create(name='Tourney 1')
cls.t2 = Tournament.objects.create(name='Tourney 2')
cls.o1 = Organiser.objects.create(name='Organiser 1')
cls.p1 = Pool.objects.create(name='T1 Pool 1', tournament=cls.t1, organiser=cls.o1)
cls.p2 = Pool.objects.create(name='T1 Pool 2', tournament=cls.t1, organiser=cls.o1)
cls.p3 = Pool.objects.create(name='T2 Pool 1', tournament=cls.t2, organiser=cls.o1)
cls.p4 = Pool.objects.create(name='T2 Pool 2', tournament=cls.t2, organiser=cls.o1)
cls.ps1 = PoolStyle.objects.create(name='T1 Pool 2 Style', pool=cls.p2)
cls.ps2 = PoolStyle.objects.create(name='T2 Pool 1 Style', pool=cls.p3)
def test_foreign_key(self):
with self.assertNumQueries(2):
tournament = Tournament.objects.get(pk=self.t1.pk)
pool = tournament.pool_set.all()[0]
self.assertIs(tournament, pool.tournament)
def test_foreign_key_prefetch_related(self):
with self.assertNumQueries(2):
tournament = (Tournament.objects.prefetch_related('pool_set').get(pk=self.t1.pk))
pool = tournament.pool_set.all()[0]
self.assertIs(tournament, pool.tournament)
def test_foreign_key_multiple_prefetch(self):
with self.assertNumQueries(2):
tournaments = list(Tournament.objects.prefetch_related('pool_set').order_by('pk'))
pool1 = tournaments[0].pool_set.all()[0]
self.assertIs(tournaments[0], pool1.tournament)
pool2 = tournaments[1].pool_set.all()[0]
self.assertIs(tournaments[1], pool2.tournament)
def test_queryset_or(self):
tournament_1 = self.t1
tournament_2 = self.t2
with self.assertNumQueries(1):
pools = tournament_1.pool_set.all() | tournament_2.pool_set.all()
related_objects = {pool.tournament for pool in pools}
self.assertEqual(related_objects, {tournament_1, tournament_2})
def test_queryset_or_different_cached_items(self):
tournament = self.t1
organiser = self.o1
with self.assertNumQueries(1):
pools = tournament.pool_set.all() | organiser.pool_set.all()
first = pools.filter(pk=self.p1.pk)[0]
self.assertIs(first.tournament, tournament)
self.assertIs(first.organiser, organiser)
def test_queryset_or_only_one_with_precache(self):
tournament_1 = self.t1
tournament_2 = self.t2
# 2 queries here as pool 3 has tournament 2, which is not cached
with self.assertNumQueries(2):
pools = tournament_1.pool_set.all() | Pool.objects.filter(pk=self.p3.pk)
related_objects = {pool.tournament for pool in pools}
self.assertEqual(related_objects, {tournament_1, tournament_2})
# and the other direction
with self.assertNumQueries(2):
pools = Pool.objects.filter(pk=self.p3.pk) | tournament_1.pool_set.all()
related_objects = {pool.tournament for pool in pools}
self.assertEqual(related_objects, {tournament_1, tournament_2})
def test_queryset_and(self):
tournament = self.t1
organiser = self.o1
with self.assertNumQueries(1):
pools = tournament.pool_set.all() & organiser.pool_set.all()
first = pools.filter(pk=self.p1.pk)[0]
self.assertIs(first.tournament, tournament)
self.assertIs(first.organiser, organiser)
def test_one_to_one(self):
with self.assertNumQueries(2):
style = PoolStyle.objects.get(pk=self.ps1.pk)
pool = style.pool
self.assertIs(style, pool.poolstyle)
def test_one_to_one_select_related(self):
with self.assertNumQueries(1):
style = PoolStyle.objects.select_related('pool').get(pk=self.ps1.pk)
pool = style.pool
self.assertIs(style, pool.poolstyle)
def test_one_to_one_multi_select_related(self):
with self.assertNumQueries(1):
poolstyles = list(PoolStyle.objects.select_related('pool').order_by('pk'))
self.assertIs(poolstyles[0], poolstyles[0].pool.poolstyle)
self.assertIs(poolstyles[1], poolstyles[1].pool.poolstyle)
def test_one_to_one_prefetch_related(self):
with self.assertNumQueries(2):
style = PoolStyle.objects.prefetch_related('pool').get(pk=self.ps1.pk)
pool = style.pool
self.assertIs(style, pool.poolstyle)
def test_one_to_one_multi_prefetch_related(self):
with self.assertNumQueries(2):
poolstyles = list(PoolStyle.objects.prefetch_related('pool').order_by('pk'))
self.assertIs(poolstyles[0], poolstyles[0].pool.poolstyle)
self.assertIs(poolstyles[1], poolstyles[1].pool.poolstyle)
def test_reverse_one_to_one(self):
with self.assertNumQueries(2):
pool = Pool.objects.get(pk=self.p2.pk)
style = pool.poolstyle
self.assertIs(pool, style.pool)
def test_reverse_one_to_one_select_related(self):
with self.assertNumQueries(1):
pool = Pool.objects.select_related('poolstyle').get(pk=self.p2.pk)
style = pool.poolstyle
self.assertIs(pool, style.pool)
def test_reverse_one_to_one_prefetch_related(self):
with self.assertNumQueries(2):
pool = Pool.objects.prefetch_related('poolstyle').get(pk=self.p2.pk)
style = pool.poolstyle
self.assertIs(pool, style.pool)
def test_reverse_one_to_one_multi_select_related(self):
with self.assertNumQueries(1):
pools = list(Pool.objects.select_related('poolstyle').order_by('pk'))
self.assertIs(pools[1], pools[1].poolstyle.pool)
self.assertIs(pools[2], pools[2].poolstyle.pool)
def test_reverse_one_to_one_multi_prefetch_related(self):
with self.assertNumQueries(2):
pools = list(Pool.objects.prefetch_related('poolstyle').order_by('pk'))
self.assertIs(pools[1], pools[1].poolstyle.pool)
self.assertIs(pools[2], pools[2].poolstyle.pool)
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