257 lines
9.6 KiB
Python
257 lines
9.6 KiB
Python
from django.db.models.signals import post_save, pre_save
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from django.test import TestCase
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from .models import Account, Employee, Person, Profile, ProxyEmployee
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class UpdateOnlyFieldsTests(TestCase):
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msg = 'The following fields do not exist in this model or are m2m fields: %s'
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def test_update_fields_basic(self):
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s = Person.objects.create(name='Sara', gender='F')
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self.assertEqual(s.gender, 'F')
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s.gender = 'M'
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s.name = 'Ian'
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s.save(update_fields=['name'])
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s = Person.objects.get(pk=s.pk)
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self.assertEqual(s.gender, 'F')
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self.assertEqual(s.name, 'Ian')
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def test_update_fields_deferred(self):
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s = Person.objects.create(name='Sara', gender='F', pid=22)
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self.assertEqual(s.gender, 'F')
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s1 = Person.objects.defer("gender", "pid").get(pk=s.pk)
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s1.name = "Emily"
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s1.gender = "M"
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with self.assertNumQueries(1):
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s1.save()
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s2 = Person.objects.get(pk=s1.pk)
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self.assertEqual(s2.name, "Emily")
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self.assertEqual(s2.gender, "M")
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def test_update_fields_only_1(self):
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s = Person.objects.create(name='Sara', gender='F')
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self.assertEqual(s.gender, 'F')
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s1 = Person.objects.only('name').get(pk=s.pk)
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s1.name = "Emily"
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s1.gender = "M"
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with self.assertNumQueries(1):
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s1.save()
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s2 = Person.objects.get(pk=s1.pk)
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self.assertEqual(s2.name, "Emily")
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self.assertEqual(s2.gender, "M")
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def test_update_fields_only_2(self):
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s = Person.objects.create(name='Sara', gender='F', pid=22)
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self.assertEqual(s.gender, 'F')
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s1 = Person.objects.only('name').get(pk=s.pk)
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s1.name = "Emily"
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s1.gender = "M"
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with self.assertNumQueries(2):
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s1.save(update_fields=['pid'])
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s2 = Person.objects.get(pk=s1.pk)
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self.assertEqual(s2.name, "Sara")
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self.assertEqual(s2.gender, "F")
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def test_update_fields_only_repeated(self):
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s = Person.objects.create(name='Sara', gender='F')
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self.assertEqual(s.gender, 'F')
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s1 = Person.objects.only('name').get(pk=s.pk)
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s1.gender = 'M'
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with self.assertNumQueries(1):
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s1.save()
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# save() should not fetch deferred fields
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s1 = Person.objects.only('name').get(pk=s.pk)
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with self.assertNumQueries(1):
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s1.save()
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def test_update_fields_inheritance_defer(self):
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profile_boss = Profile.objects.create(name='Boss', salary=3000)
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e1 = Employee.objects.create(name='Sara', gender='F', employee_num=1, profile=profile_boss)
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e1 = Employee.objects.only('name').get(pk=e1.pk)
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e1.name = 'Linda'
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with self.assertNumQueries(1):
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e1.save()
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self.assertEqual(Employee.objects.get(pk=e1.pk).name, 'Linda')
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def test_update_fields_fk_defer(self):
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profile_boss = Profile.objects.create(name='Boss', salary=3000)
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profile_receptionist = Profile.objects.create(name='Receptionist', salary=1000)
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e1 = Employee.objects.create(name='Sara', gender='F', employee_num=1, profile=profile_boss)
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e1 = Employee.objects.only('profile').get(pk=e1.pk)
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e1.profile = profile_receptionist
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with self.assertNumQueries(1):
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e1.save()
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self.assertEqual(Employee.objects.get(pk=e1.pk).profile, profile_receptionist)
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e1.profile_id = profile_boss.pk
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with self.assertNumQueries(1):
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e1.save()
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self.assertEqual(Employee.objects.get(pk=e1.pk).profile, profile_boss)
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def test_select_related_only_interaction(self):
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profile_boss = Profile.objects.create(name='Boss', salary=3000)
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e1 = Employee.objects.create(name='Sara', gender='F', employee_num=1, profile=profile_boss)
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e1 = Employee.objects.only('profile__salary').select_related('profile').get(pk=e1.pk)
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profile_boss.name = 'Clerk'
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profile_boss.salary = 1000
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profile_boss.save()
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# The loaded salary of 3000 gets saved, the name of 'Clerk' isn't
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# overwritten.
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with self.assertNumQueries(1):
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e1.profile.save()
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reloaded_profile = Profile.objects.get(pk=profile_boss.pk)
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self.assertEqual(reloaded_profile.name, profile_boss.name)
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self.assertEqual(reloaded_profile.salary, 3000)
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def test_update_fields_m2m(self):
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profile_boss = Profile.objects.create(name='Boss', salary=3000)
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e1 = Employee.objects.create(name='Sara', gender='F', employee_num=1, profile=profile_boss)
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a1 = Account.objects.create(num=1)
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a2 = Account.objects.create(num=2)
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e1.accounts.set([a1, a2])
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with self.assertRaisesMessage(ValueError, self.msg % 'accounts'):
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e1.save(update_fields=['accounts'])
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def test_update_fields_inheritance(self):
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profile_boss = Profile.objects.create(name='Boss', salary=3000)
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profile_receptionist = Profile.objects.create(name='Receptionist', salary=1000)
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e1 = Employee.objects.create(name='Sara', gender='F', employee_num=1, profile=profile_boss)
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e1.name = 'Ian'
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e1.gender = 'M'
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e1.save(update_fields=['name'])
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e2 = Employee.objects.get(pk=e1.pk)
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self.assertEqual(e2.name, 'Ian')
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self.assertEqual(e2.gender, 'F')
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self.assertEqual(e2.profile, profile_boss)
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e2.profile = profile_receptionist
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e2.name = 'Sara'
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e2.save(update_fields=['profile'])
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e3 = Employee.objects.get(pk=e1.pk)
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self.assertEqual(e3.name, 'Ian')
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self.assertEqual(e3.profile, profile_receptionist)
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with self.assertNumQueries(1):
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e3.profile = profile_boss
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e3.save(update_fields=['profile_id'])
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e4 = Employee.objects.get(pk=e3.pk)
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self.assertEqual(e4.profile, profile_boss)
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self.assertEqual(e4.profile_id, profile_boss.pk)
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def test_update_fields_inheritance_with_proxy_model(self):
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profile_boss = Profile.objects.create(name='Boss', salary=3000)
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profile_receptionist = Profile.objects.create(name='Receptionist', salary=1000)
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e1 = ProxyEmployee.objects.create(name='Sara', gender='F', employee_num=1, profile=profile_boss)
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e1.name = 'Ian'
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e1.gender = 'M'
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e1.save(update_fields=['name'])
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e2 = ProxyEmployee.objects.get(pk=e1.pk)
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self.assertEqual(e2.name, 'Ian')
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self.assertEqual(e2.gender, 'F')
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self.assertEqual(e2.profile, profile_boss)
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e2.profile = profile_receptionist
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e2.name = 'Sara'
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e2.save(update_fields=['profile'])
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e3 = ProxyEmployee.objects.get(pk=e1.pk)
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self.assertEqual(e3.name, 'Ian')
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self.assertEqual(e3.profile, profile_receptionist)
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def test_update_fields_signals(self):
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p = Person.objects.create(name='Sara', gender='F')
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pre_save_data = []
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def pre_save_receiver(**kwargs):
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pre_save_data.append(kwargs['update_fields'])
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pre_save.connect(pre_save_receiver)
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post_save_data = []
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def post_save_receiver(**kwargs):
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post_save_data.append(kwargs['update_fields'])
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post_save.connect(post_save_receiver)
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p.save(update_fields=['name'])
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self.assertEqual(len(pre_save_data), 1)
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self.assertEqual(len(pre_save_data[0]), 1)
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self.assertIn('name', pre_save_data[0])
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self.assertEqual(len(post_save_data), 1)
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self.assertEqual(len(post_save_data[0]), 1)
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self.assertIn('name', post_save_data[0])
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pre_save.disconnect(pre_save_receiver)
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post_save.disconnect(post_save_receiver)
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def test_update_fields_incorrect_params(self):
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s = Person.objects.create(name='Sara', gender='F')
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with self.assertRaisesMessage(ValueError, self.msg % 'first_name'):
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s.save(update_fields=['first_name'])
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# "name" is treated as an iterable so the output is something like
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# "n, a, m, e" but the order isn't deterministic.
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with self.assertRaisesMessage(ValueError, self.msg % ''):
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s.save(update_fields="name")
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def test_empty_update_fields(self):
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s = Person.objects.create(name='Sara', gender='F')
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pre_save_data = []
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def pre_save_receiver(**kwargs):
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pre_save_data.append(kwargs['update_fields'])
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pre_save.connect(pre_save_receiver)
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post_save_data = []
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def post_save_receiver(**kwargs):
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post_save_data.append(kwargs['update_fields'])
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post_save.connect(post_save_receiver)
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# Save is skipped.
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with self.assertNumQueries(0):
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s.save(update_fields=[])
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# Signals were skipped, too...
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self.assertEqual(len(pre_save_data), 0)
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self.assertEqual(len(post_save_data), 0)
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pre_save.disconnect(pre_save_receiver)
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post_save.disconnect(post_save_receiver)
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def test_num_queries_inheritance(self):
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s = Employee.objects.create(name='Sara', gender='F')
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s.employee_num = 1
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s.name = 'Emily'
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with self.assertNumQueries(1):
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s.save(update_fields=['employee_num'])
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s = Employee.objects.get(pk=s.pk)
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self.assertEqual(s.employee_num, 1)
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self.assertEqual(s.name, 'Sara')
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s.employee_num = 2
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s.name = 'Emily'
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with self.assertNumQueries(1):
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s.save(update_fields=['name'])
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s = Employee.objects.get(pk=s.pk)
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self.assertEqual(s.name, 'Emily')
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self.assertEqual(s.employee_num, 1)
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# A little sanity check that we actually did updates...
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self.assertEqual(Employee.objects.count(), 1)
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self.assertEqual(Person.objects.count(), 1)
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with self.assertNumQueries(2):
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s.save(update_fields=['name', 'employee_num'])
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