mirror of
https://github.com/django/django.git
synced 2024-12-23 09:36:06 +00:00
286 lines
11 KiB
Python
286 lines
11 KiB
Python
import unittest
|
|
|
|
from django.core.exceptions import FieldError
|
|
from django.db import IntegrityError, connection, transaction
|
|
from django.db.models import CharField, Count, F, IntegerField, Max
|
|
from django.db.models.functions import Abs, Concat, Lower
|
|
from django.test import TestCase
|
|
from django.test.utils import register_lookup
|
|
|
|
from .models import (
|
|
A,
|
|
B,
|
|
Bar,
|
|
D,
|
|
DataPoint,
|
|
Foo,
|
|
RelatedPoint,
|
|
UniqueNumber,
|
|
UniqueNumberChild,
|
|
)
|
|
|
|
|
|
class SimpleTest(TestCase):
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
cls.a1 = A.objects.create()
|
|
cls.a2 = A.objects.create()
|
|
for x in range(20):
|
|
B.objects.create(a=cls.a1)
|
|
D.objects.create(a=cls.a1)
|
|
|
|
def test_nonempty_update(self):
|
|
"""
|
|
Update changes the right number of rows for a nonempty queryset
|
|
"""
|
|
num_updated = self.a1.b_set.update(y=100)
|
|
self.assertEqual(num_updated, 20)
|
|
cnt = B.objects.filter(y=100).count()
|
|
self.assertEqual(cnt, 20)
|
|
|
|
def test_empty_update(self):
|
|
"""
|
|
Update changes the right number of rows for an empty queryset
|
|
"""
|
|
num_updated = self.a2.b_set.update(y=100)
|
|
self.assertEqual(num_updated, 0)
|
|
cnt = B.objects.filter(y=100).count()
|
|
self.assertEqual(cnt, 0)
|
|
|
|
def test_nonempty_update_with_inheritance(self):
|
|
"""
|
|
Update changes the right number of rows for an empty queryset
|
|
when the update affects only a base table
|
|
"""
|
|
num_updated = self.a1.d_set.update(y=100)
|
|
self.assertEqual(num_updated, 20)
|
|
cnt = D.objects.filter(y=100).count()
|
|
self.assertEqual(cnt, 20)
|
|
|
|
def test_empty_update_with_inheritance(self):
|
|
"""
|
|
Update changes the right number of rows for an empty queryset
|
|
when the update affects only a base table
|
|
"""
|
|
num_updated = self.a2.d_set.update(y=100)
|
|
self.assertEqual(num_updated, 0)
|
|
cnt = D.objects.filter(y=100).count()
|
|
self.assertEqual(cnt, 0)
|
|
|
|
def test_foreign_key_update_with_id(self):
|
|
"""
|
|
Update works using <field>_id for foreign keys
|
|
"""
|
|
num_updated = self.a1.d_set.update(a_id=self.a2)
|
|
self.assertEqual(num_updated, 20)
|
|
self.assertEqual(self.a2.d_set.count(), 20)
|
|
|
|
|
|
class AdvancedTests(TestCase):
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
cls.d0 = DataPoint.objects.create(name="d0", value="apple")
|
|
cls.d2 = DataPoint.objects.create(name="d2", value="banana")
|
|
cls.d3 = DataPoint.objects.create(name="d3", value="banana")
|
|
cls.r1 = RelatedPoint.objects.create(name="r1", data=cls.d3)
|
|
|
|
def test_update(self):
|
|
"""
|
|
Objects are updated by first filtering the candidates into a queryset
|
|
and then calling the update() method. It executes immediately and
|
|
returns nothing.
|
|
"""
|
|
resp = DataPoint.objects.filter(value="apple").update(name="d1")
|
|
self.assertEqual(resp, 1)
|
|
resp = DataPoint.objects.filter(value="apple")
|
|
self.assertEqual(list(resp), [self.d0])
|
|
|
|
def test_update_multiple_objects(self):
|
|
"""
|
|
We can update multiple objects at once.
|
|
"""
|
|
resp = DataPoint.objects.filter(value="banana").update(value="pineapple")
|
|
self.assertEqual(resp, 2)
|
|
self.assertEqual(DataPoint.objects.get(name="d2").value, "pineapple")
|
|
|
|
def test_update_fk(self):
|
|
"""
|
|
Foreign key fields can also be updated, although you can only update
|
|
the object referred to, not anything inside the related object.
|
|
"""
|
|
resp = RelatedPoint.objects.filter(name="r1").update(data=self.d0)
|
|
self.assertEqual(resp, 1)
|
|
resp = RelatedPoint.objects.filter(data__name="d0")
|
|
self.assertEqual(list(resp), [self.r1])
|
|
|
|
def test_update_multiple_fields(self):
|
|
"""
|
|
Multiple fields can be updated at once
|
|
"""
|
|
resp = DataPoint.objects.filter(value="apple").update(
|
|
value="fruit", another_value="peach"
|
|
)
|
|
self.assertEqual(resp, 1)
|
|
d = DataPoint.objects.get(name="d0")
|
|
self.assertEqual(d.value, "fruit")
|
|
self.assertEqual(d.another_value, "peach")
|
|
|
|
def test_update_all(self):
|
|
"""
|
|
In the rare case you want to update every instance of a model, update()
|
|
is also a manager method.
|
|
"""
|
|
self.assertEqual(DataPoint.objects.update(value="thing"), 3)
|
|
resp = DataPoint.objects.values("value").distinct()
|
|
self.assertEqual(list(resp), [{"value": "thing"}])
|
|
|
|
def test_update_slice_fail(self):
|
|
"""
|
|
We do not support update on already sliced query sets.
|
|
"""
|
|
method = DataPoint.objects.all()[:2].update
|
|
msg = "Cannot update a query once a slice has been taken."
|
|
with self.assertRaisesMessage(TypeError, msg):
|
|
method(another_value="another thing")
|
|
|
|
def test_update_respects_to_field(self):
|
|
"""
|
|
Update of an FK field which specifies a to_field works.
|
|
"""
|
|
a_foo = Foo.objects.create(target="aaa")
|
|
b_foo = Foo.objects.create(target="bbb")
|
|
bar = Bar.objects.create(foo=a_foo)
|
|
self.assertEqual(bar.foo_id, a_foo.target)
|
|
bar_qs = Bar.objects.filter(pk=bar.pk)
|
|
self.assertEqual(bar_qs[0].foo_id, a_foo.target)
|
|
bar_qs.update(foo=b_foo)
|
|
self.assertEqual(bar_qs[0].foo_id, b_foo.target)
|
|
|
|
def test_update_m2m_field(self):
|
|
msg = (
|
|
"Cannot update model field "
|
|
"<django.db.models.fields.related.ManyToManyField: m2m_foo> "
|
|
"(only non-relations and foreign keys permitted)."
|
|
)
|
|
with self.assertRaisesMessage(FieldError, msg):
|
|
Bar.objects.update(m2m_foo="whatever")
|
|
|
|
def test_update_transformed_field(self):
|
|
A.objects.create(x=5)
|
|
A.objects.create(x=-6)
|
|
with register_lookup(IntegerField, Abs):
|
|
A.objects.update(x=F("x__abs"))
|
|
self.assertCountEqual(A.objects.values_list("x", flat=True), [5, 6])
|
|
|
|
def test_update_annotated_queryset(self):
|
|
"""
|
|
Update of a queryset that's been annotated.
|
|
"""
|
|
# Trivial annotated update
|
|
qs = DataPoint.objects.annotate(alias=F("value"))
|
|
self.assertEqual(qs.update(another_value="foo"), 3)
|
|
# Update where annotation is used for filtering
|
|
qs = DataPoint.objects.annotate(alias=F("value")).filter(alias="apple")
|
|
self.assertEqual(qs.update(another_value="foo"), 1)
|
|
# Update where annotation is used in update parameters
|
|
qs = DataPoint.objects.annotate(alias=F("value"))
|
|
self.assertEqual(qs.update(another_value=F("alias")), 3)
|
|
# Update where aggregation annotation is used in update parameters
|
|
qs = DataPoint.objects.annotate(max=Max("value"))
|
|
msg = (
|
|
"Aggregate functions are not allowed in this query "
|
|
"(another_value=Max(Col(update_datapoint, update.DataPoint.value)))."
|
|
)
|
|
with self.assertRaisesMessage(FieldError, msg):
|
|
qs.update(another_value=F("max"))
|
|
|
|
def test_update_annotated_multi_table_queryset(self):
|
|
"""
|
|
Update of a queryset that's been annotated and involves multiple tables.
|
|
"""
|
|
# Trivial annotated update
|
|
qs = DataPoint.objects.annotate(related_count=Count("relatedpoint"))
|
|
self.assertEqual(qs.update(value="Foo"), 3)
|
|
# Update where annotation is used for filtering
|
|
qs = DataPoint.objects.annotate(related_count=Count("relatedpoint"))
|
|
self.assertEqual(qs.filter(related_count=1).update(value="Foo"), 1)
|
|
# Update where aggregation annotation is used in update parameters
|
|
qs = RelatedPoint.objects.annotate(max=Max("data__value"))
|
|
msg = "Joined field references are not permitted in this query"
|
|
with self.assertRaisesMessage(FieldError, msg):
|
|
qs.update(name=F("max"))
|
|
|
|
def test_update_with_joined_field_annotation(self):
|
|
msg = "Joined field references are not permitted in this query"
|
|
with register_lookup(CharField, Lower):
|
|
for annotation in (
|
|
F("data__name"),
|
|
F("data__name__lower"),
|
|
Lower("data__name"),
|
|
Concat("data__name", "data__value"),
|
|
):
|
|
with self.subTest(annotation=annotation):
|
|
with self.assertRaisesMessage(FieldError, msg):
|
|
RelatedPoint.objects.annotate(
|
|
new_name=annotation,
|
|
).update(name=F("new_name"))
|
|
|
|
|
|
@unittest.skipUnless(
|
|
connection.vendor == "mysql",
|
|
"UPDATE...ORDER BY syntax is supported on MySQL/MariaDB",
|
|
)
|
|
class MySQLUpdateOrderByTest(TestCase):
|
|
"""Update field with a unique constraint using an ordered queryset."""
|
|
|
|
@classmethod
|
|
def setUpTestData(cls):
|
|
UniqueNumber.objects.create(number=1)
|
|
UniqueNumber.objects.create(number=2)
|
|
|
|
def test_order_by_update_on_unique_constraint(self):
|
|
tests = [
|
|
("-number", "id"),
|
|
(F("number").desc(), "id"),
|
|
(F("number") * -1, "id"),
|
|
]
|
|
for ordering in tests:
|
|
with self.subTest(ordering=ordering), transaction.atomic():
|
|
updated = UniqueNumber.objects.order_by(*ordering).update(
|
|
number=F("number") + 1,
|
|
)
|
|
self.assertEqual(updated, 2)
|
|
|
|
def test_order_by_update_on_unique_constraint_annotation(self):
|
|
# Ordering by annotations is omitted because they cannot be resolved in
|
|
# .update().
|
|
with self.assertRaises(IntegrityError):
|
|
UniqueNumber.objects.annotate(number_inverse=F("number").desc(),).order_by(
|
|
"number_inverse"
|
|
).update(
|
|
number=F("number") + 1,
|
|
)
|
|
|
|
def test_order_by_update_on_parent_unique_constraint(self):
|
|
# Ordering by inherited fields is omitted because joined fields cannot
|
|
# be used in the ORDER BY clause.
|
|
UniqueNumberChild.objects.create(number=3)
|
|
UniqueNumberChild.objects.create(number=4)
|
|
with self.assertRaises(IntegrityError):
|
|
UniqueNumberChild.objects.order_by("number").update(
|
|
number=F("number") + 1,
|
|
)
|
|
|
|
def test_order_by_update_on_related_field(self):
|
|
# Ordering by related fields is omitted because joined fields cannot be
|
|
# used in the ORDER BY clause.
|
|
data = DataPoint.objects.create(name="d0", value="apple")
|
|
related = RelatedPoint.objects.create(name="r0", data=data)
|
|
with self.assertNumQueries(1) as ctx:
|
|
updated = RelatedPoint.objects.order_by("data__name").update(name="new")
|
|
sql = ctx.captured_queries[0]["sql"]
|
|
self.assertNotIn("ORDER BY", sql)
|
|
self.assertEqual(updated, 1)
|
|
related.refresh_from_db()
|
|
self.assertEqual(related.name, "new")
|