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 = set(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 = set(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 = set(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)