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from __future__ import unicode_literals
from django.db.models.signals import post_save, pre_save
from django.test import TestCase
from .models import Account, Employee, Person, Profile, ProxyEmployee
class UpdateOnlyFieldsTests(TestCase):
def test_update_fields_basic(self):
s = Person.objects.create(name='Sara', gender='F')
self.assertEqual(s.gender, 'F')
s.gender = 'M'
s.name = 'Ian'
s.save(update_fields=['name'])
s = Person.objects.get(pk=s.pk)
self.assertEqual(s.gender, 'F')
self.assertEqual(s.name, 'Ian')
def test_update_fields_deferred(self):
s = Person.objects.create(name='Sara', gender='F', pid=22)
self.assertEqual(s.gender, 'F')
s1 = Person.objects.defer("gender", "pid").get(pk=s.pk)
s1.name = "Emily"
s1.gender = "M"
with self.assertNumQueries(1):
s1.save()
s2 = Person.objects.get(pk=s1.pk)
self.assertEqual(s2.name, "Emily")
self.assertEqual(s2.gender, "M")
def test_update_fields_only_1(self):
s = Person.objects.create(name='Sara', gender='F')
self.assertEqual(s.gender, 'F')
s1 = Person.objects.only('name').get(pk=s.pk)
s1.name = "Emily"
s1.gender = "M"
with self.assertNumQueries(1):
s1.save()
s2 = Person.objects.get(pk=s1.pk)
self.assertEqual(s2.name, "Emily")
self.assertEqual(s2.gender, "M")
def test_update_fields_only_2(self):
s = Person.objects.create(name='Sara', gender='F', pid=22)
self.assertEqual(s.gender, 'F')
s1 = Person.objects.only('name').get(pk=s.pk)
s1.name = "Emily"
s1.gender = "M"
with self.assertNumQueries(2):
s1.save(update_fields=['pid'])
s2 = Person.objects.get(pk=s1.pk)
self.assertEqual(s2.name, "Sara")
self.assertEqual(s2.gender, "F")
def test_update_fields_only_repeated(self):
s = Person.objects.create(name='Sara', gender='F')
self.assertEqual(s.gender, 'F')
s1 = Person.objects.only('name').get(pk=s.pk)
s1.gender = 'M'
with self.assertNumQueries(1):
s1.save()
# Test that the deferred class does not remember that gender was
# set, instead the instance should remember this.
s1 = Person.objects.only('name').get(pk=s.pk)
with self.assertNumQueries(1):
s1.save()
def test_update_fields_inheritance_defer(self):
profile_boss = Profile.objects.create(name='Boss', salary=3000)
e1 = Employee.objects.create(name='Sara', gender='F',
employee_num=1, profile=profile_boss)
e1 = Employee.objects.only('name').get(pk=e1.pk)
e1.name = 'Linda'
with self.assertNumQueries(1):
e1.save()
self.assertEqual(Employee.objects.get(pk=e1.pk).name,
'Linda')
def test_update_fields_fk_defer(self):
profile_boss = Profile.objects.create(name='Boss', salary=3000)
profile_receptionist = Profile.objects.create(name='Receptionist', salary=1000)
e1 = Employee.objects.create(name='Sara', gender='F',
employee_num=1, profile=profile_boss)
e1 = Employee.objects.only('profile').get(pk=e1.pk)
e1.profile = profile_receptionist
with self.assertNumQueries(1):
e1.save()
self.assertEqual(Employee.objects.get(pk=e1.pk).profile, profile_receptionist)
e1.profile_id = profile_boss.pk
with self.assertNumQueries(1):
e1.save()
self.assertEqual(Employee.objects.get(pk=e1.pk).profile, profile_boss)
def test_select_related_only_interaction(self):
profile_boss = Profile.objects.create(name='Boss', salary=3000)
e1 = Employee.objects.create(name='Sara', gender='F',
employee_num=1, profile=profile_boss)
e1 = Employee.objects.only('profile__salary').select_related('profile').get(pk=e1.pk)
profile_boss.name = 'Clerk'
profile_boss.salary = 1000
profile_boss.save()
# The loaded salary of 3000 gets saved, the name of 'Clerk' isn't
# overwritten.
with self.assertNumQueries(1):
e1.profile.save()
reloaded_profile = Profile.objects.get(pk=profile_boss.pk)
self.assertEqual(reloaded_profile.name, profile_boss.name)
self.assertEqual(reloaded_profile.salary, 3000)
def test_update_fields_m2m(self):
profile_boss = Profile.objects.create(name='Boss', salary=3000)
e1 = Employee.objects.create(name='Sara', gender='F',
employee_num=1, profile=profile_boss)
a1 = Account.objects.create(num=1)
a2 = Account.objects.create(num=2)
e1.accounts.set([a1, a2])
with self.assertRaises(ValueError):
e1.save(update_fields=['accounts'])
def test_update_fields_inheritance(self):
profile_boss = Profile.objects.create(name='Boss', salary=3000)
profile_receptionist = Profile.objects.create(name='Receptionist', salary=1000)
e1 = Employee.objects.create(name='Sara', gender='F',
employee_num=1, profile=profile_boss)
e1.name = 'Ian'
e1.gender = 'M'
e1.save(update_fields=['name'])
e2 = Employee.objects.get(pk=e1.pk)
self.assertEqual(e2.name, 'Ian')
self.assertEqual(e2.gender, 'F')
self.assertEqual(e2.profile, profile_boss)
e2.profile = profile_receptionist
e2.name = 'Sara'
e2.save(update_fields=['profile'])
e3 = Employee.objects.get(pk=e1.pk)
self.assertEqual(e3.name, 'Ian')
self.assertEqual(e3.profile, profile_receptionist)
with self.assertNumQueries(1):
e3.profile = profile_boss
e3.save(update_fields=['profile_id'])
e4 = Employee.objects.get(pk=e3.pk)
self.assertEqual(e4.profile, profile_boss)
self.assertEqual(e4.profile_id, profile_boss.pk)
def test_update_fields_inheritance_with_proxy_model(self):
profile_boss = Profile.objects.create(name='Boss', salary=3000)
profile_receptionist = Profile.objects.create(name='Receptionist', salary=1000)
e1 = ProxyEmployee.objects.create(name='Sara', gender='F',
employee_num=1, profile=profile_boss)
e1.name = 'Ian'
e1.gender = 'M'
e1.save(update_fields=['name'])
e2 = ProxyEmployee.objects.get(pk=e1.pk)
self.assertEqual(e2.name, 'Ian')
self.assertEqual(e2.gender, 'F')
self.assertEqual(e2.profile, profile_boss)
e2.profile = profile_receptionist
e2.name = 'Sara'
e2.save(update_fields=['profile'])
e3 = ProxyEmployee.objects.get(pk=e1.pk)
self.assertEqual(e3.name, 'Ian')
self.assertEqual(e3.profile, profile_receptionist)
def test_update_fields_signals(self):
p = Person.objects.create(name='Sara', gender='F')
pre_save_data = []
def pre_save_receiver(**kwargs):
pre_save_data.append(kwargs['update_fields'])
pre_save.connect(pre_save_receiver)
post_save_data = []
def post_save_receiver(**kwargs):
post_save_data.append(kwargs['update_fields'])
post_save.connect(post_save_receiver)
p.save(update_fields=['name'])
self.assertEqual(len(pre_save_data), 1)
self.assertEqual(len(pre_save_data[0]), 1)
self.assertIn('name', pre_save_data[0])
self.assertEqual(len(post_save_data), 1)
self.assertEqual(len(post_save_data[0]), 1)
self.assertIn('name', post_save_data[0])
pre_save.disconnect(pre_save_receiver)
post_save.disconnect(post_save_receiver)
def test_update_fields_incorrect_params(self):
s = Person.objects.create(name='Sara', gender='F')
with self.assertRaises(ValueError):
s.save(update_fields=['first_name'])
with self.assertRaises(ValueError):
s.save(update_fields="name")
def test_empty_update_fields(self):
s = Person.objects.create(name='Sara', gender='F')
pre_save_data = []
def pre_save_receiver(**kwargs):
pre_save_data.append(kwargs['update_fields'])
pre_save.connect(pre_save_receiver)
post_save_data = []
def post_save_receiver(**kwargs):
post_save_data.append(kwargs['update_fields'])
post_save.connect(post_save_receiver)
# Save is skipped.
with self.assertNumQueries(0):
s.save(update_fields=[])
# Signals were skipped, too...
self.assertEqual(len(pre_save_data), 0)
self.assertEqual(len(post_save_data), 0)
pre_save.disconnect(pre_save_receiver)
post_save.disconnect(post_save_receiver)
def test_num_queries_inheritance(self):
s = Employee.objects.create(name='Sara', gender='F')
s.employee_num = 1
s.name = 'Emily'
with self.assertNumQueries(1):
s.save(update_fields=['employee_num'])
s = Employee.objects.get(pk=s.pk)
self.assertEqual(s.employee_num, 1)
self.assertEqual(s.name, 'Sara')
s.employee_num = 2
s.name = 'Emily'
with self.assertNumQueries(1):
s.save(update_fields=['name'])
s = Employee.objects.get(pk=s.pk)
self.assertEqual(s.name, 'Emily')
self.assertEqual(s.employee_num, 1)
# A little sanity check that we actually did updates...
self.assertEqual(Employee.objects.count(), 1)
self.assertEqual(Person.objects.count(), 1)
with self.assertNumQueries(2):
s.save(update_fields=['name', 'employee_num'])
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