/tests/regressiontests/select_related_regress/tests.py
Python | 134 lines | 126 code | 2 blank | 6 comment | 0 complexity | 6dcbdeeb15d9dc46d10961c1579830b6 MD5 | raw file
Possible License(s): BSD-3-Clause
1from django.test import TestCase 2from regressiontests.select_related_regress.models import * 3 4class SelectRelatedRegressTests(TestCase): 5 6 def test_regression_7110(self): 7 """ 8 Regression test for bug #7110. 9 10 When using select_related(), we must query the 11 Device and Building tables using two different aliases (each) in order to 12 differentiate the start and end Connection fields. The net result is that 13 both the "connections = ..." queries here should give the same results 14 without pulling in more than the absolute minimum number of tables 15 (history has shown that it's easy to make a mistake in the implementation 16 and include some unnecessary bonus joins). 17 """ 18 19 b=Building.objects.create(name='101') 20 dev1=Device.objects.create(name="router", building=b) 21 dev2=Device.objects.create(name="switch", building=b) 22 dev3=Device.objects.create(name="server", building=b) 23 port1=Port.objects.create(port_number='4',device=dev1) 24 port2=Port.objects.create(port_number='7',device=dev2) 25 port3=Port.objects.create(port_number='1',device=dev3) 26 c1=Connection.objects.create(start=port1, end=port2) 27 c2=Connection.objects.create(start=port2, end=port3) 28 29 connections=Connection.objects.filter(start__device__building=b, end__device__building=b).order_by('id') 30 self.assertEqual([(c.id, unicode(c.start), unicode(c.end)) for c in connections], 31 [(c1.id, u'router/4', u'switch/7'), (c2.id, u'switch/7', u'server/1')]) 32 33 connections=Connection.objects.filter(start__device__building=b, end__device__building=b).select_related().order_by('id') 34 self.assertEqual([(c.id, unicode(c.start), unicode(c.end)) for c in connections], 35 [(c1.id, u'router/4', u'switch/7'), (c2.id, u'switch/7', u'server/1')]) 36 37 # This final query should only join seven tables (port, device and building 38 # twice each, plus connection once). 39 self.assertEqual(connections.query.count_active_tables(), 7) 40 41 42 def test_regression_8106(self): 43 """ 44 Regression test for bug #8106. 45 46 Same sort of problem as the previous test, but this time there are 47 more extra tables to pull in as part of the select_related() and some 48 of them could potentially clash (so need to be kept separate). 49 """ 50 51 us = TUser.objects.create(name="std") 52 usp = Person.objects.create(user=us) 53 uo = TUser.objects.create(name="org") 54 uop = Person.objects.create(user=uo) 55 s = Student.objects.create(person = usp) 56 o = Organizer.objects.create(person = uop) 57 c = Class.objects.create(org=o) 58 e = Enrollment.objects.create(std=s, cls=c) 59 60 e_related = Enrollment.objects.all().select_related()[0] 61 self.assertEqual(e_related.std.person.user.name, u"std") 62 self.assertEqual(e_related.cls.org.person.user.name, u"org") 63 64 def test_regression_8036(self): 65 """ 66 Regression test for bug #8036 67 68 the first related model in the tests below 69 ("state") is empty and we try to select the more remotely related 70 state__country. The regression here was not skipping the empty column results 71 for country before getting status. 72 """ 73 74 australia = Country.objects.create(name='Australia') 75 active = ClientStatus.objects.create(name='active') 76 client = Client.objects.create(name='client', status=active) 77 78 self.assertEqual(client.status, active) 79 self.assertEqual(Client.objects.select_related()[0].status, active) 80 self.assertEqual(Client.objects.select_related('state')[0].status, active) 81 self.assertEqual(Client.objects.select_related('state', 'status')[0].status, active) 82 self.assertEqual(Client.objects.select_related('state__country')[0].status, active) 83 self.assertEqual(Client.objects.select_related('state__country', 'status')[0].status, active) 84 self.assertEqual(Client.objects.select_related('status')[0].status, active) 85 86 def test_multi_table_inheritance(self): 87 """ Exercising select_related() with multi-table model inheritance. """ 88 c1 = Child.objects.create(name="child1", value=42) 89 i1 = Item.objects.create(name="item1", child=c1) 90 i2 = Item.objects.create(name="item2") 91 92 self.assertQuerysetEqual( 93 Item.objects.select_related("child").order_by("name"), 94 ["<Item: item1>", "<Item: item2>"] 95 ) 96 97 def test_regression_12851(self): 98 """ 99 Regression for #12851 100 101 Deferred fields are used correctly if you select_related a subset 102 of fields. 103 """ 104 australia = Country.objects.create(name='Australia') 105 active = ClientStatus.objects.create(name='active') 106 107 wa = State.objects.create(name="Western Australia", country=australia) 108 c1 = Client.objects.create(name='Brian Burke', state=wa, status=active) 109 burke = Client.objects.select_related('state').defer('state__name').get(name='Brian Burke') 110 111 self.assertEqual(burke.name, u'Brian Burke') 112 self.assertEqual(burke.state.name, u'Western Australia') 113 114 # Still works if we're dealing with an inherited class 115 sc1 = SpecialClient.objects.create(name='Troy Buswell', state=wa, status=active, value=42) 116 troy = SpecialClient.objects.select_related('state').defer('state__name').get(name='Troy Buswell') 117 118 self.assertEqual(troy.name, u'Troy Buswell') 119 self.assertEqual(troy.value, 42) 120 self.assertEqual(troy.state.name, u'Western Australia') 121 122 # Still works if we defer an attribute on the inherited class 123 troy = SpecialClient.objects.select_related('state').defer('value', 'state__name').get(name='Troy Buswell') 124 125 self.assertEqual(troy.name, u'Troy Buswell') 126 self.assertEqual(troy.value, 42) 127 self.assertEqual(troy.state.name, u'Western Australia') 128 129 # Also works if you use only, rather than defer 130 troy = SpecialClient.objects.select_related('state').only('name').get(name='Troy Buswell') 131 132 self.assertEqual(troy.name, u'Troy Buswell') 133 self.assertEqual(troy.value, 42) 134 self.assertEqual(troy.state.name, u'Western Australia')