mirror of
https://github.com/django/django.git
synced 2024-12-28 12:06:22 +00:00
7414704e88
Special thanks to Hannes Ljungberg for finding multiple implementation gaps. Thanks also to Simon Charette, Adam Johnson, and Mariusz Felisiak for reviews.
205 lines
7.4 KiB
Python
205 lines
7.4 KiB
Python
from datetime import datetime
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from math import pi
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from django.db import connection
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from django.db.models import Case, F, FloatField, Value, When
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from django.db.models.expressions import (
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Expression,
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ExpressionList,
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ExpressionWrapper,
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Func,
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OrderByList,
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RawSQL,
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)
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from django.db.models.functions import Collate
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from django.db.models.lookups import GreaterThan
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from django.test import SimpleTestCase, TestCase, skipIfDBFeature, skipUnlessDBFeature
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from .models import (
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Article,
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DBArticle,
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DBDefaults,
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DBDefaultsFK,
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DBDefaultsFunction,
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DBDefaultsPK,
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)
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class DefaultTests(TestCase):
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def test_field_defaults(self):
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a = Article()
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now = datetime.now()
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a.save()
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self.assertIsInstance(a.id, int)
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self.assertEqual(a.headline, "Default headline")
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self.assertLess((now - a.pub_date).seconds, 5)
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@skipUnlessDBFeature(
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"can_return_columns_from_insert", "supports_expression_defaults"
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)
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def test_field_db_defaults_returning(self):
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a = DBArticle()
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a.save()
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self.assertIsInstance(a.id, int)
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self.assertEqual(a.headline, "Default headline")
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self.assertIsInstance(a.pub_date, datetime)
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@skipIfDBFeature("can_return_columns_from_insert")
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@skipUnlessDBFeature("supports_expression_defaults")
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def test_field_db_defaults_refresh(self):
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a = DBArticle()
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a.save()
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a.refresh_from_db()
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self.assertIsInstance(a.id, int)
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self.assertEqual(a.headline, "Default headline")
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self.assertIsInstance(a.pub_date, datetime)
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def test_null_db_default(self):
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obj1 = DBDefaults.objects.create()
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if not connection.features.can_return_columns_from_insert:
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obj1.refresh_from_db()
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self.assertEqual(obj1.null, 1.1)
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obj2 = DBDefaults.objects.create(null=None)
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self.assertIsNone(obj2.null)
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@skipUnlessDBFeature("supports_expression_defaults")
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def test_db_default_function(self):
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m = DBDefaultsFunction.objects.create()
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if not connection.features.can_return_columns_from_insert:
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m.refresh_from_db()
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self.assertAlmostEqual(m.number, pi)
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self.assertEqual(m.year, datetime.now().year)
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self.assertAlmostEqual(m.added, pi + 4.5)
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self.assertEqual(m.multiple_subfunctions, 4.5)
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@skipUnlessDBFeature("insert_test_table_with_defaults")
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def test_both_default(self):
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create_sql = connection.features.insert_test_table_with_defaults
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with connection.cursor() as cursor:
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cursor.execute(create_sql.format(DBDefaults._meta.db_table))
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obj1 = DBDefaults.objects.get()
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self.assertEqual(obj1.both, 2)
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obj2 = DBDefaults.objects.create()
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self.assertEqual(obj2.both, 1)
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def test_pk_db_default(self):
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obj1 = DBDefaultsPK.objects.create()
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if not connection.features.can_return_columns_from_insert:
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# refresh_from_db() cannot be used because that needs the pk to
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# already be known to Django.
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obj1 = DBDefaultsPK.objects.get(pk="en")
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self.assertEqual(obj1.pk, "en")
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self.assertEqual(obj1.language_code, "en")
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obj2 = DBDefaultsPK.objects.create(language_code="de")
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self.assertEqual(obj2.pk, "de")
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self.assertEqual(obj2.language_code, "de")
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def test_foreign_key_db_default(self):
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parent1 = DBDefaultsPK.objects.create(language_code="fr")
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child1 = DBDefaultsFK.objects.create()
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if not connection.features.can_return_columns_from_insert:
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child1.refresh_from_db()
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self.assertEqual(child1.language_code, parent1)
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parent2 = DBDefaultsPK.objects.create()
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if not connection.features.can_return_columns_from_insert:
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# refresh_from_db() cannot be used because that needs the pk to
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# already be known to Django.
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parent2 = DBDefaultsPK.objects.get(pk="en")
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child2 = DBDefaultsFK.objects.create(language_code=parent2)
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self.assertEqual(child2.language_code, parent2)
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@skipUnlessDBFeature(
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"can_return_columns_from_insert", "supports_expression_defaults"
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)
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def test_case_when_db_default_returning(self):
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m = DBDefaultsFunction.objects.create()
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self.assertEqual(m.case_when, 3)
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@skipIfDBFeature("can_return_columns_from_insert")
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@skipUnlessDBFeature("supports_expression_defaults")
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def test_case_when_db_default_no_returning(self):
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m = DBDefaultsFunction.objects.create()
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m.refresh_from_db()
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self.assertEqual(m.case_when, 3)
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@skipUnlessDBFeature("supports_expression_defaults")
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def test_bulk_create_all_db_defaults(self):
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articles = [DBArticle(), DBArticle()]
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DBArticle.objects.bulk_create(articles)
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headlines = DBArticle.objects.values_list("headline", flat=True)
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self.assertSequenceEqual(headlines, ["Default headline", "Default headline"])
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@skipUnlessDBFeature("supports_expression_defaults")
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def test_bulk_create_all_db_defaults_one_field(self):
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pub_date = datetime.now()
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articles = [DBArticle(pub_date=pub_date), DBArticle(pub_date=pub_date)]
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DBArticle.objects.bulk_create(articles)
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headlines = DBArticle.objects.values_list("headline", "pub_date")
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self.assertSequenceEqual(
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headlines,
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[
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("Default headline", pub_date),
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("Default headline", pub_date),
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],
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)
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@skipUnlessDBFeature("supports_expression_defaults")
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def test_bulk_create_mixed_db_defaults(self):
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articles = [DBArticle(), DBArticle(headline="Something else")]
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DBArticle.objects.bulk_create(articles)
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headlines = DBArticle.objects.values_list("headline", flat=True)
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self.assertCountEqual(headlines, ["Default headline", "Something else"])
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@skipUnlessDBFeature("supports_expression_defaults")
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def test_bulk_create_mixed_db_defaults_function(self):
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instances = [DBDefaultsFunction(), DBDefaultsFunction(year=2000)]
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DBDefaultsFunction.objects.bulk_create(instances)
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years = DBDefaultsFunction.objects.values_list("year", flat=True)
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self.assertCountEqual(years, [2000, datetime.now().year])
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class AllowedDefaultTests(SimpleTestCase):
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def test_allowed(self):
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class Max(Func):
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function = "MAX"
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tests = [
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Value(10),
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Max(1, 2),
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RawSQL("Now()", ()),
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Value(10) + Value(7), # Combined expression.
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ExpressionList(Value(1), Value(2)),
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ExpressionWrapper(Value(1), output_field=FloatField()),
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Case(When(GreaterThan(2, 1), then=3), default=4),
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]
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for expression in tests:
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with self.subTest(expression=expression):
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self.assertIs(expression.allowed_default, True)
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def test_disallowed(self):
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class Max(Func):
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function = "MAX"
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tests = [
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Expression(),
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F("field"),
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Max(F("count"), 1),
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Value(10) + F("count"), # Combined expression.
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ExpressionList(F("count"), Value(2)),
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ExpressionWrapper(F("count"), output_field=FloatField()),
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Collate(Value("John"), "nocase"),
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OrderByList("field"),
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]
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for expression in tests:
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with self.subTest(expression=expression):
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self.assertIs(expression.allowed_default, False)
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