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226 lines
8.1 KiB
Python
226 lines
8.1 KiB
Python
from datetime import datetime
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from decimal import Decimal
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from math import pi
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from django.core.exceptions import ValidationError
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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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self.assertEqual(a.cost, Decimal("3.33"))
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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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self.assertEqual(a.cost, Decimal("3.33"))
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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", "cost")
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self.assertSequenceEqual(
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headlines,
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[
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("Default headline", pub_date, Decimal("3.33")),
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("Default headline", pub_date, Decimal("3.33")),
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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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def test_full_clean(self):
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obj = DBArticle()
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obj.full_clean()
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obj.save()
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obj.refresh_from_db()
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self.assertEqual(obj.headline, "Default headline")
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obj = DBArticle(headline="Other title")
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obj.full_clean()
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obj.save()
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obj.refresh_from_db()
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self.assertEqual(obj.headline, "Other title")
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obj = DBArticle(headline="")
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with self.assertRaises(ValidationError):
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obj.full_clean()
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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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