/
test_query_counts.py
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/
test_query_counts.py
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# -*- coding: utf-8 -*-
from __future__ import absolute_import
from __future__ import unicode_literals
from django.test import TestCase
from test_app.models import A, AA, AB, BA, BB, CA, CB, CC
from test_app.models import FK, FK2, FK3, FK4, FK5, FK6, FK7, FK8
class QueryCounts(TestCase):
def test_complex_models_all_not_including_self(self):
models = (AA, AB, BA, BB, CA, CB, CC)
with self.assertNumQueries(32):
A._default_manager.create()
FK._default_manager.create()
for m in models:
m._default_manager.create()
with self.assertNumQueries(1):
tuple(A.polymorphs.models(*models, include_self=False))
def test_complex_models_all_including_self(self):
models = (AA, AB, BA, BB, CA, CB, CC)
with self.assertNumQueries(32):
A._default_manager.create()
FK._default_manager.create()
for m in models:
m._default_manager.create()
with self.assertNumQueries(1):
tuple(A.polymorphs.models(*models, include_self=True))
def test_resetting(self):
models = (AA, AB, BA, BB, CA, CB, CC)
with self.assertNumQueries(32):
A._default_manager.create()
FK._default_manager.create()
for m in models:
m._default_manager.create()
with self.assertRaises(ValueError):
tuple(A.polymorphs.select_related('fk').models(*models, include_self=False).models(None))
class SanityChecksTestCase(TestCase):
def test_cc_prefetch_related(self):
"""
proving to myself how prefetching from the grandchild works.
"""
with self.assertNumQueries(9):
fk3 = FK3.objects.create()
fk8 = FK8.objects.create()
fk5 = FK5.objects.create()
out = CC._default_manager.create(fk3=fk3, fk5=fk5, fk8=fk8, fk=None)
# 1 CC query + 1 each for fk3,fk5,fk8
with self.assertNumQueries(4):
list(CC.objects.prefetch_related('fk3', 'fk5', 'fk8').filter(pk=out))
class RelationQueryCounts(TestCase):
def test_not_doing_any_prefetching_related_via_children(self):
with self.assertNumQueries(39):
fk = FK.objects.create()
fk2 = FK2.objects.create()
fk3 = FK3.objects.create()
fk4 = FK4.objects.create()
fk5 = FK5.objects.create()
fk6 = FK6.objects.create()
fk7 = FK7.objects.create()
fk8 = FK8.objects.create()
pk_a = A._default_manager.create(fk=fk).pk
pk_aa = AA._default_manager.create(fk2=fk2).pk
pk_ab = AB._default_manager.create(fk=fk, fk3=fk3).pk
pk_ba = BA._default_manager.create(fk2=fk2, fk4=fk4).pk
pk_bb = BB._default_manager.create(fk3=fk3, fk5=fk5).pk
pk_ca = CA._default_manager.create(fk4=fk4, fk2=fk2, fk6=fk6).pk
pk_cb = CB._default_manager.create(fk4=fk4, fk2=fk2, fk7=fk7).pk
pk_cc = CC._default_manager.create(fk3=fk3, fk5=fk5, fk8=fk8).pk
with self.assertNumQueries(2):
a = A._default_manager.get(pk=pk_a)
assert a.fk == fk
with self.assertNumQueries(2):
aa = AA._default_manager.get(pk=pk_aa)
assert aa.fk2 == fk2
assert aa.fk is None
with self.assertNumQueries(3):
ab = AB._default_manager.get(pk=pk_ab)
assert ab.fk3 == fk3
assert ab.fk == fk
with self.assertNumQueries(3):
ba = BA._default_manager.get(pk=pk_ba)
assert ba.fk4 == fk4
assert ba.fk2 == fk2
assert ba.fk is None
with self.assertNumQueries(3):
bb = BB._default_manager.get(pk=pk_bb)
assert bb.fk5 == fk5
assert bb.fk3 == fk3
assert bb.fk is None
with self.assertNumQueries(4):
ca = CA._default_manager.get(pk=pk_ca)
assert ca.fk6 == fk6
assert ca.fk2 == fk2
assert ca.fk4 == fk4
assert ca.fk is None
with self.assertNumQueries(4):
cb = CB._default_manager.get(pk=pk_cb)
assert cb.fk7 == fk7
assert cb.fk2 == fk2
assert cb.fk4 == fk4
assert cb.fk is None
with self.assertNumQueries(4):
cc = CC._default_manager.get(pk=pk_cc)
assert cc.fk8 == fk8
assert cc.fk5 == fk5
assert cc.fk3 == fk3
assert cc.fk is None
def test_select_related_is_unaffected(self):
with self.assertNumQueries(39):
fk = FK.objects.create()
fk2 = FK2.objects.create()
fk3 = FK3.objects.create()
fk4 = FK4.objects.create()
fk5 = FK5.objects.create()
fk6 = FK6.objects.create()
fk7 = FK7.objects.create()
fk8 = FK8.objects.create()
pk_a = A._default_manager.create(fk=fk).pk
pk_aa = AA._default_manager.create(fk2=fk2).pk
pk_ab = AB._default_manager.create(fk=fk, fk3=fk3).pk
pk_ba = BA._default_manager.create(fk2=fk2, fk4=fk4).pk
pk_bb = BB._default_manager.create(fk3=fk3, fk5=fk5).pk
pk_ca = CA._default_manager.create(fk4=fk4, fk2=fk2, fk6=fk6).pk
pk_cb = CB._default_manager.create(fk4=fk4, fk2=fk2, fk7=fk7).pk
pk_cc = CC._default_manager.create(fk3=fk3, fk5=fk5, fk8=fk8).pk
with self.assertNumQueries(1):
a = A.polymorphs.select_related('fk').get(pk=pk_a)
assert a.fk == fk
with self.assertNumQueries(1):
prefetches = ('aa__fk2', 'aa__fk')
aa = A.polymorphs.select_subclasses(AA).select_related(*prefetches).get(pk=pk_aa)
assert aa.fk2 == fk2
assert aa.fk is None
with self.assertNumQueries(1):
prefetches = ('ab__fk3', 'ab__fk')
ab = A.polymorphs.select_subclasses(AB).select_related(*prefetches).get(pk=pk_ab)
assert ab.fk3 == fk3
assert ab.fk == fk
with self.assertNumQueries(1):
prefetches = ('aa__ba__fk4', 'aa__ba__fk2', 'aa__ba__fk')
ba = A.polymorphs.select_subclasses(BA).select_related(*prefetches).get(pk=pk_ba)
assert ba.fk4 == fk4
assert ba.fk2 == fk2
assert ba.fk is None
with self.assertNumQueries(1):
prefetches = ('ab__bb__fk5', 'ab__bb__fk3', 'ab__bb__fk')
bb = A.polymorphs.select_subclasses(BB).select_related(*prefetches).get(pk=pk_bb)
assert bb.fk5 == fk5
assert bb.fk3 == fk3
assert bb.fk is None
with self.assertNumQueries(1):
prefetches = (
'aa__ba__ca__fk6', 'aa__ba__ca__fk2', 'aa__ba__ca__fk4',
'aa__ba__ca__fk')
ca = A.polymorphs.select_subclasses(CA).select_related(*prefetches).get(pk=pk_ca)
assert ca.fk6 == fk6
assert ca.fk2 == fk2
assert ca.fk4 == fk4
assert ca.fk is None
with self.assertNumQueries(1):
prefetches = (
'aa__ba__cb__fk7', 'aa__ba__cb__fk2', 'aa__ba__cb__fk4',
'aa__ba__cb__fk')
cb = A.polymorphs.select_subclasses(CB).select_related(*prefetches).get(pk=pk_cb)
assert cb.fk7 == fk7
assert cb.fk2 == fk2
assert cb.fk4 == fk4
assert cb.fk is None
with self.assertNumQueries(1):
prefetches = (
'ab__bb__cc__fk5', 'ab__bb__cc__fk8', 'ab__bb__cc__fk3',
'ab__bb__cc__fk')
cc = A.polymorphs.select_subclasses(CC).select_related(*prefetches).get(pk=pk_cc)
assert cc.fk8 == fk8
assert cc.fk5 == fk5
assert cc.fk3 == fk3
assert cc.fk is None
def test_prefetch_related(self):
with self.assertNumQueries(39):
fk = FK.objects.create()
fk2 = FK2.objects.create()
fk3 = FK3.objects.create()
fk4 = FK4.objects.create()
fk5 = FK5.objects.create()
fk6 = FK6.objects.create()
fk7 = FK7.objects.create()
fk8 = FK8.objects.create()
pk_a = A._default_manager.create(fk=fk).pk
pk_aa = AA._default_manager.create(fk2=fk2).pk
pk_ab = AB._default_manager.create(fk=fk, fk3=fk3).pk
pk_ba = BA._default_manager.create(fk2=fk2, fk4=fk4).pk
pk_bb = BB._default_manager.create(fk3=fk3, fk5=fk5).pk
pk_ca = CA._default_manager.create(fk4=fk4, fk2=fk2, fk6=fk6).pk
pk_cb = CB._default_manager.create(fk4=fk4, fk2=fk2, fk7=fk7).pk
pk_cc = CC._default_manager.create(fk3=fk3, fk5=fk5, fk8=fk8).pk
#
# with self.assertNumQueries(2):
# a = A.polymorphs.get(pk=pk_a)
# assert a.fk == fk
#
# with self.assertNumQueries(1):
# prefetches = ('aa__fk2', 'aa__fk')
# aa = A.polymorphs.select_subclasses(AA).prefetch_related(*prefetches).get(pk=pk_aa)
# assert aa.fk2 == fk2
# assert aa.fk is None
#
# with self.assertNumQueries(1):
# prefetches = ('ab__fk3', 'ab__fk')
# ab = A.polymorphs.select_subclasses(AB).prefetch_related(*prefetches).get(pk=pk_ab)
# assert ab.fk3 == fk3
# assert ab.fk == fk
#
# with self.assertNumQueries(1):
# prefetches = ('aa__ba__fk4', 'aa__ba__fk2', 'aa__ba__fk')
# ba = A.polymorphs.select_subclasses(BA).prefetch_related(*prefetches).get(pk=pk_ba)
# assert ba.fk4 == fk4
# assert ba.fk2 == fk2
# assert ba.fk is None
#
# with self.assertNumQueries(1):
# prefetches = ('ab__bb__fk5', 'ab__bb__fk3', 'ab__bb__fk')
# bb = A.polymorphs.select_subclasses(BB).prefetch_related(*prefetches).get(pk=pk_bb)
# assert bb.fk5 == fk5
# assert bb.fk3 == fk3
# assert bb.fk is None
#
# with self.assertNumQueries(1):
# prefetches = (
# 'aa__ba__ca__fk6', 'aa__ba__ca__fk2', 'aa__ba__ca__fk4',
# 'aa__ba__ca__fk')
# ca = A.polymorphs.select_subclasses(CA).prefetch_related(*prefetches).get(pk=pk_ca)
# assert ca.fk6 == fk6
# assert ca.fk2 == fk2
# assert ca.fk4 == fk4
# assert ca.fk is None
#
# with self.assertNumQueries(1):
# prefetches = (
# 'aa__ba__cb__fk7', 'aa__ba__cb__fk2', 'aa__ba__cb__fk4',
# 'aa__ba__cb__fk')
# cb = A.polymorphs.select_subclasses(CB).prefetch_related(*prefetches).get(pk=pk_cb)
# assert cb.fk7 == fk7
# assert cb.fk2 == fk2
# assert cb.fk4 == fk4
# assert cb.fk is None
with self.assertNumQueries(1):
prefetches = (
'ab__bb__cc__fk5', 'ab__bb__cc__fk8', 'ab__bb__cc__fk3',
'ab__bb__cc__fk')
cc = A.polymorphs.select_subclasses(CC).prefetch_related(*prefetches).get(pk=pk_cc)
assert cc.fk8 == fk8
assert cc.fk5 == fk5
assert cc.fk3 == fk3
assert cc.fk is None