205 lines
9.2 KiB
Python
205 lines
9.2 KiB
Python
from django.test import TestCase
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from .models import (
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A, B, Building, C, Chick, Child, Class, Client, ClientStatus, Connection,
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Country, Device, Enrollment, Hen, Item, Organizer, Person, Port,
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SpecialClient, State, Student, TUser,
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)
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class SelectRelatedRegressTests(TestCase):
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def test_regression_7110(self):
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"""
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Regression test for bug #7110.
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When using select_related(), we must query the
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Device and Building tables using two different aliases (each) in order to
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differentiate the start and end Connection fields. The net result is that
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both the "connections = ..." queries here should give the same results
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without pulling in more than the absolute minimum number of tables
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(history has shown that it's easy to make a mistake in the implementation
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and include some unnecessary bonus joins).
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"""
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b = Building.objects.create(name='101')
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dev1 = Device.objects.create(name="router", building=b)
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dev2 = Device.objects.create(name="switch", building=b)
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dev3 = Device.objects.create(name="server", building=b)
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port1 = Port.objects.create(port_number='4', device=dev1)
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port2 = Port.objects.create(port_number='7', device=dev2)
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port3 = Port.objects.create(port_number='1', device=dev3)
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c1 = Connection.objects.create(start=port1, end=port2)
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c2 = Connection.objects.create(start=port2, end=port3)
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connections = Connection.objects.filter(start__device__building=b, end__device__building=b).order_by('id')
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self.assertEqual(
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[(c.id, str(c.start), str(c.end)) for c in connections],
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[(c1.id, 'router/4', 'switch/7'), (c2.id, 'switch/7', 'server/1')]
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)
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connections = (
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Connection.objects
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.filter(start__device__building=b, end__device__building=b)
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.select_related()
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.order_by('id')
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)
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self.assertEqual(
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[(c.id, str(c.start), str(c.end)) for c in connections],
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[(c1.id, 'router/4', 'switch/7'), (c2.id, 'switch/7', 'server/1')]
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)
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# This final query should only have seven tables (port, device and building
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# twice each, plus connection once). Thus, 6 joins plus the FROM table.
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self.assertEqual(str(connections.query).count(" JOIN "), 6)
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def test_regression_8106(self):
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"""
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Regression test for bug #8106.
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Same sort of problem as the previous test, but this time there are
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more extra tables to pull in as part of the select_related() and some
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of them could potentially clash (so need to be kept separate).
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"""
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us = TUser.objects.create(name="std")
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usp = Person.objects.create(user=us)
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uo = TUser.objects.create(name="org")
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uop = Person.objects.create(user=uo)
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s = Student.objects.create(person=usp)
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o = Organizer.objects.create(person=uop)
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c = Class.objects.create(org=o)
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Enrollment.objects.create(std=s, cls=c)
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e_related = Enrollment.objects.all().select_related()[0]
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self.assertEqual(e_related.std.person.user.name, "std")
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self.assertEqual(e_related.cls.org.person.user.name, "org")
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def test_regression_8036(self):
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"""
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Regression test for bug #8036
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the first related model in the tests below
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("state") is empty and we try to select the more remotely related
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state__country. The regression here was not skipping the empty column results
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for country before getting status.
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"""
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Country.objects.create(name='Australia')
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active = ClientStatus.objects.create(name='active')
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client = Client.objects.create(name='client', status=active)
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self.assertEqual(client.status, active)
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self.assertEqual(Client.objects.select_related()[0].status, active)
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self.assertEqual(Client.objects.select_related('state')[0].status, active)
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self.assertEqual(Client.objects.select_related('state', 'status')[0].status, active)
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self.assertEqual(Client.objects.select_related('state__country')[0].status, active)
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self.assertEqual(Client.objects.select_related('state__country', 'status')[0].status, active)
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self.assertEqual(Client.objects.select_related('status')[0].status, active)
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def test_multi_table_inheritance(self):
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""" Exercising select_related() with multi-table model inheritance. """
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c1 = Child.objects.create(name="child1", value=42)
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i1 = Item.objects.create(name="item1", child=c1)
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i2 = Item.objects.create(name="item2")
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self.assertSequenceEqual(
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Item.objects.select_related("child").order_by("name"),
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[i1, i2],
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)
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def test_regression_12851(self):
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"""
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Regression for #12851
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Deferred fields are used correctly if you select_related a subset
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of fields.
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"""
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australia = Country.objects.create(name='Australia')
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active = ClientStatus.objects.create(name='active')
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wa = State.objects.create(name="Western Australia", country=australia)
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Client.objects.create(name='Brian Burke', state=wa, status=active)
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burke = Client.objects.select_related('state').defer('state__name').get(name='Brian Burke')
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self.assertEqual(burke.name, 'Brian Burke')
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self.assertEqual(burke.state.name, 'Western Australia')
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# Still works if we're dealing with an inherited class
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SpecialClient.objects.create(name='Troy Buswell', state=wa, status=active, value=42)
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troy = SpecialClient.objects.select_related('state').defer('state__name').get(name='Troy Buswell')
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self.assertEqual(troy.name, 'Troy Buswell')
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self.assertEqual(troy.value, 42)
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self.assertEqual(troy.state.name, 'Western Australia')
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# Still works if we defer an attribute on the inherited class
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troy = SpecialClient.objects.select_related('state').defer('value', 'state__name').get(name='Troy Buswell')
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self.assertEqual(troy.name, 'Troy Buswell')
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self.assertEqual(troy.value, 42)
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self.assertEqual(troy.state.name, 'Western Australia')
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# Also works if you use only, rather than defer
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troy = SpecialClient.objects.select_related('state').only('name', 'state').get(name='Troy Buswell')
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self.assertEqual(troy.name, 'Troy Buswell')
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self.assertEqual(troy.value, 42)
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self.assertEqual(troy.state.name, 'Western Australia')
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def test_null_join_promotion(self):
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australia = Country.objects.create(name='Australia')
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active = ClientStatus.objects.create(name='active')
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wa = State.objects.create(name="Western Australia", country=australia)
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bob = Client.objects.create(name='Bob', status=active)
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jack = Client.objects.create(name='Jack', status=active, state=wa)
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qs = Client.objects.filter(state=wa).select_related('state')
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with self.assertNumQueries(1):
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self.assertEqual(list(qs), [jack])
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self.assertEqual(qs[0].state, wa)
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# The select_related join wasn't promoted as there was already an
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# existing (even if trimmed) inner join to state.
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self.assertNotIn('LEFT OUTER', str(qs.query))
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qs = Client.objects.select_related('state').order_by('name')
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with self.assertNumQueries(1):
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self.assertEqual(list(qs), [bob, jack])
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self.assertIs(qs[0].state, None)
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self.assertEqual(qs[1].state, wa)
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# The select_related join was promoted as there is already an
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# existing join.
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self.assertIn('LEFT OUTER', str(qs.query))
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def test_regression_19870(self):
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hen = Hen.objects.create(name='Hen')
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Chick.objects.create(name='Chick', mother=hen)
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self.assertEqual(Chick.objects.all()[0].mother.name, 'Hen')
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self.assertEqual(Chick.objects.select_related()[0].mother.name, 'Hen')
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def test_regression_10733(self):
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a = A.objects.create(name='a', lots_of_text='lots_of_text_a', a_field='a_field')
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b = B.objects.create(name='b', lots_of_text='lots_of_text_b', b_field='b_field')
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c = C.objects.create(name='c', lots_of_text='lots_of_text_c', is_published=True,
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c_a=a, c_b=b)
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results = C.objects.all().only('name', 'lots_of_text', 'c_a', 'c_b', 'c_b__lots_of_text',
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'c_a__name', 'c_b__name').select_related()
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self.assertSequenceEqual(results, [c])
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with self.assertNumQueries(0):
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qs_c = results[0]
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self.assertEqual(qs_c.name, 'c')
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self.assertEqual(qs_c.lots_of_text, 'lots_of_text_c')
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self.assertEqual(qs_c.c_b.lots_of_text, 'lots_of_text_b')
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self.assertEqual(qs_c.c_a.name, 'a')
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self.assertEqual(qs_c.c_b.name, 'b')
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def test_regression_22508(self):
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building = Building.objects.create(name='101')
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device = Device.objects.create(name="router", building=building)
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Port.objects.create(port_number='1', device=device)
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device = Device.objects.get()
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port = device.port_set.select_related('device__building').get()
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with self.assertNumQueries(0):
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port.device.building
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