django/tests/update_only_fields/tests.py

285 lines
10 KiB
Python

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):
msg = (
"The following fields do not exist in this model, are m2m fields, or "
"are non-concrete fields: %s"
)
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()
# save() should not fetch deferred fields
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.assertRaisesMessage(ValueError, self.msg % "accounts"):
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.assertRaisesMessage(ValueError, self.msg % "first_name"):
s.save(update_fields=["first_name"])
# "name" is treated as an iterable so the output is something like
# "n, a, m, e" but the order isn't deterministic.
with self.assertRaisesMessage(ValueError, self.msg % ""):
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"])
def test_update_non_concrete_field(self):
profile_boss = Profile.objects.create(name="Boss", salary=3000)
with self.assertRaisesMessage(ValueError, self.msg % "non_concrete"):
profile_boss.save(update_fields=["non_concrete"])