1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
from django.db.models import FilteredRelation
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)
cls.ps3 = PoolStyle.objects.create(
name="T1 Pool 1/3 Style", pool=cls.p1, another_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)
def test_reverse_fk_select_related_multiple(self):
with self.assertNumQueries(1):
ps = list(
PoolStyle.objects.annotate(
pool_1=FilteredRelation("pool"),
pool_2=FilteredRelation("another_pool"),
)
.select_related("pool_1", "pool_2")
.order_by("-pk")
)
self.assertIs(ps[0], ps[0].pool_1.poolstyle)
self.assertIs(ps[0], ps[0].pool_2.another_style)
def test_multilevel_reverse_fk_cyclic_select_related(self):
with self.assertNumQueries(3):
p = list(
PoolStyle.objects.annotate(
tournament_pool=FilteredRelation("pool__tournament__pool"),
).select_related("tournament_pool", "tournament_pool__tournament")
)
self.assertEqual(p[0].tournament_pool.tournament, p[0].pool.tournament)
def test_multilevel_reverse_fk_select_related(self):
with self.assertNumQueries(2):
p = list(
Tournament.objects.filter(id=self.t2.id)
.annotate(
style=FilteredRelation("pool__another_style"),
)
.select_related("style")
)
self.assertEqual(p[0].style.another_pool, self.p3)
|
