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