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200 lines
8.0 KiB
Python
200 lines
8.0 KiB
Python
from django.core.exceptions import ValidationError
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from django.db import IntegrityError, connection, models
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from django.db.models.constraints import BaseConstraint
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from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
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from .models import ChildModel, Product, UniqueConstraintProduct
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def get_constraints(table):
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with connection.cursor() as cursor:
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return connection.introspection.get_constraints(cursor, table)
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class BaseConstraintTests(SimpleTestCase):
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def test_constraint_sql(self):
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c = BaseConstraint('name')
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msg = 'This method must be implemented by a subclass.'
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with self.assertRaisesMessage(NotImplementedError, msg):
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c.constraint_sql(None, None)
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def test_create_sql(self):
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c = BaseConstraint('name')
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msg = 'This method must be implemented by a subclass.'
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with self.assertRaisesMessage(NotImplementedError, msg):
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c.create_sql(None, None)
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def test_remove_sql(self):
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c = BaseConstraint('name')
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msg = 'This method must be implemented by a subclass.'
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with self.assertRaisesMessage(NotImplementedError, msg):
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c.remove_sql(None, None)
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class CheckConstraintTests(TestCase):
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def test_eq(self):
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check1 = models.Q(price__gt=models.F('discounted_price'))
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check2 = models.Q(price__lt=models.F('discounted_price'))
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self.assertEqual(
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models.CheckConstraint(check=check1, name='price'),
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models.CheckConstraint(check=check1, name='price'),
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)
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self.assertNotEqual(
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models.CheckConstraint(check=check1, name='price'),
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models.CheckConstraint(check=check1, name='price2'),
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)
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self.assertNotEqual(
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models.CheckConstraint(check=check1, name='price'),
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models.CheckConstraint(check=check2, name='price'),
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)
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self.assertNotEqual(models.CheckConstraint(check=check1, name='price'), 1)
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def test_repr(self):
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check = models.Q(price__gt=models.F('discounted_price'))
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name = 'price_gt_discounted_price'
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constraint = models.CheckConstraint(check=check, name=name)
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self.assertEqual(
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repr(constraint),
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"<CheckConstraint: check='{}' name='{}'>".format(check, name),
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)
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def test_deconstruction(self):
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check = models.Q(price__gt=models.F('discounted_price'))
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name = 'price_gt_discounted_price'
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constraint = models.CheckConstraint(check=check, name=name)
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path, args, kwargs = constraint.deconstruct()
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self.assertEqual(path, 'django.db.models.CheckConstraint')
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self.assertEqual(args, ())
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self.assertEqual(kwargs, {'check': check, 'name': name})
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@skipUnlessDBFeature('supports_table_check_constraints')
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def test_database_constraint(self):
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Product.objects.create(price=10, discounted_price=5)
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with self.assertRaises(IntegrityError):
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Product.objects.create(price=10, discounted_price=20)
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@skipUnlessDBFeature('supports_table_check_constraints', 'can_introspect_check_constraints')
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def test_name(self):
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constraints = get_constraints(Product._meta.db_table)
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for expected_name in (
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'price_gt_discounted_price',
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'constraints_product_price_gt_0',
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):
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with self.subTest(expected_name):
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self.assertIn(expected_name, constraints)
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@skipUnlessDBFeature('supports_table_check_constraints', 'can_introspect_check_constraints')
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def test_abstract_name(self):
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constraints = get_constraints(ChildModel._meta.db_table)
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self.assertIn('constraints_childmodel_adult', constraints)
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class UniqueConstraintTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.p1, cls.p2 = UniqueConstraintProduct.objects.bulk_create([
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UniqueConstraintProduct(name='p1', color='red'),
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UniqueConstraintProduct(name='p2'),
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])
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def test_eq(self):
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self.assertEqual(
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models.UniqueConstraint(fields=['foo', 'bar'], name='unique'),
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models.UniqueConstraint(fields=['foo', 'bar'], name='unique'),
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)
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self.assertNotEqual(
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models.UniqueConstraint(fields=['foo', 'bar'], name='unique'),
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models.UniqueConstraint(fields=['foo', 'bar'], name='unique2'),
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)
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self.assertNotEqual(
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models.UniqueConstraint(fields=['foo', 'bar'], name='unique'),
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models.UniqueConstraint(fields=['foo', 'baz'], name='unique'),
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)
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self.assertNotEqual(models.UniqueConstraint(fields=['foo', 'bar'], name='unique'), 1)
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def test_eq_with_condition(self):
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self.assertEqual(
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models.UniqueConstraint(
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fields=['foo', 'bar'], name='unique',
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condition=models.Q(foo=models.F('bar'))
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),
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models.UniqueConstraint(
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fields=['foo', 'bar'], name='unique',
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condition=models.Q(foo=models.F('bar'))),
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)
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self.assertNotEqual(
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models.UniqueConstraint(
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fields=['foo', 'bar'],
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name='unique',
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condition=models.Q(foo=models.F('bar'))
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),
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models.UniqueConstraint(
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fields=['foo', 'bar'],
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name='unique',
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condition=models.Q(foo=models.F('baz'))
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),
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)
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def test_repr(self):
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fields = ['foo', 'bar']
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name = 'unique_fields'
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constraint = models.UniqueConstraint(fields=fields, name=name)
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self.assertEqual(
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repr(constraint),
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"<UniqueConstraint: fields=('foo', 'bar') name='unique_fields'>",
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)
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def test_repr_with_condition(self):
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constraint = models.UniqueConstraint(
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fields=['foo', 'bar'],
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name='unique_fields',
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condition=models.Q(foo=models.F('bar')),
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)
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self.assertEqual(
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repr(constraint),
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"<UniqueConstraint: fields=('foo', 'bar') name='unique_fields' "
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"condition=(AND: ('foo', F(bar)))>",
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)
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def test_deconstruction(self):
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fields = ['foo', 'bar']
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name = 'unique_fields'
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constraint = models.UniqueConstraint(fields=fields, name=name)
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path, args, kwargs = constraint.deconstruct()
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self.assertEqual(path, 'django.db.models.UniqueConstraint')
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self.assertEqual(args, ())
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self.assertEqual(kwargs, {'fields': tuple(fields), 'name': name})
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def test_deconstruction_with_condition(self):
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fields = ['foo', 'bar']
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name = 'unique_fields'
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condition = models.Q(foo=models.F('bar'))
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constraint = models.UniqueConstraint(fields=fields, name=name, condition=condition)
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path, args, kwargs = constraint.deconstruct()
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self.assertEqual(path, 'django.db.models.UniqueConstraint')
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self.assertEqual(args, ())
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self.assertEqual(kwargs, {'fields': tuple(fields), 'name': name, 'condition': condition})
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def test_database_constraint(self):
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with self.assertRaises(IntegrityError):
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UniqueConstraintProduct.objects.create(name=self.p1.name, color=self.p1.color)
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def test_model_validation(self):
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msg = 'Unique constraint product with this Name and Color already exists.'
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with self.assertRaisesMessage(ValidationError, msg):
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UniqueConstraintProduct(name=self.p1.name, color=self.p1.color).validate_unique()
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def test_model_validation_with_condition(self):
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"""Partial unique constraints are ignored by Model.validate_unique()."""
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UniqueConstraintProduct(name=self.p1.name, color='blue').validate_unique()
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UniqueConstraintProduct(name=self.p2.name).validate_unique()
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def test_name(self):
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constraints = get_constraints(UniqueConstraintProduct._meta.db_table)
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expected_name = 'name_color_uniq'
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self.assertIn(expected_name, constraints)
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def test_condition_must_be_q(self):
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with self.assertRaisesMessage(ValueError, 'UniqueConstraint.condition must be a Q instance.'):
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models.UniqueConstraint(name='uniq', fields=['name'], condition='invalid')
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