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564 lines
22 KiB
Python
564 lines
22 KiB
Python
from unittest import mock
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from django.db import transaction
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from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
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from .models import Article, InheritedArticleA, InheritedArticleB, Publication, User
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class ManyToManyTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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# Create a couple of Publications.
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cls.p1 = Publication.objects.create(title="The Python Journal")
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cls.p2 = Publication.objects.create(title="Science News")
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cls.p3 = Publication.objects.create(title="Science Weekly")
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cls.p4 = Publication.objects.create(title="Highlights for Children")
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cls.a1 = Article.objects.create(
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headline="Django lets you build web apps easily"
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)
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cls.a1.publications.add(cls.p1)
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cls.a2 = Article.objects.create(headline="NASA uses Python")
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cls.a2.publications.add(cls.p1, cls.p2, cls.p3, cls.p4)
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cls.a3 = Article.objects.create(headline="NASA finds intelligent life on Earth")
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cls.a3.publications.add(cls.p2)
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cls.a4 = Article.objects.create(headline="Oxygen-free diet works wonders")
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cls.a4.publications.add(cls.p2)
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def test_add(self):
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# Create an Article.
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a5 = Article(headline="Django lets you create web apps easily")
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# You can't associate it with a Publication until it's been saved.
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msg = (
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'"<Article: Django lets you create web apps easily>" needs to have '
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'a value for field "id" before this many-to-many relationship can be used.'
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)
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with self.assertRaisesMessage(ValueError, msg):
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getattr(a5, "publications")
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# Save it!
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a5.save()
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# Associate the Article with a Publication.
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a5.publications.add(self.p1)
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self.assertSequenceEqual(a5.publications.all(), [self.p1])
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# Create another Article, and set it to appear in both Publications.
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a6 = Article(headline="ESA uses Python")
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a6.save()
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a6.publications.add(self.p1, self.p2)
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a6.publications.add(self.p3)
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# Adding a second time is OK
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a6.publications.add(self.p3)
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self.assertSequenceEqual(
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a6.publications.all(),
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[self.p2, self.p3, self.p1],
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)
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# Adding an object of the wrong type raises TypeError
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msg = (
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"'Publication' instance expected, got <Article: Django lets you create web "
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"apps easily>"
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)
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with self.assertRaisesMessage(TypeError, msg):
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with transaction.atomic():
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a6.publications.add(a5)
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# Add a Publication directly via publications.add by using keyword arguments.
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p5 = a6.publications.create(title="Highlights for Adults")
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self.assertSequenceEqual(
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a6.publications.all(),
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[p5, self.p2, self.p3, self.p1],
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)
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def test_add_remove_set_by_pk(self):
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a5 = Article.objects.create(headline="Django lets you create web apps easily")
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a5.publications.add(self.p1.pk)
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self.assertSequenceEqual(a5.publications.all(), [self.p1])
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a5.publications.set([self.p2.pk])
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self.assertSequenceEqual(a5.publications.all(), [self.p2])
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a5.publications.remove(self.p2.pk)
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self.assertSequenceEqual(a5.publications.all(), [])
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def test_add_remove_set_by_to_field(self):
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user_1 = User.objects.create(username="Jean")
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user_2 = User.objects.create(username="Joe")
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a5 = Article.objects.create(headline="Django lets you create web apps easily")
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a5.authors.add(user_1.username)
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self.assertSequenceEqual(a5.authors.all(), [user_1])
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a5.authors.set([user_2.username])
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self.assertSequenceEqual(a5.authors.all(), [user_2])
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a5.authors.remove(user_2.username)
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self.assertSequenceEqual(a5.authors.all(), [])
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def test_related_manager_refresh(self):
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user_1 = User.objects.create(username="Jean")
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user_2 = User.objects.create(username="Joe")
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self.a3.authors.add(user_1.username)
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self.assertSequenceEqual(user_1.article_set.all(), [self.a3])
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# Change the username on a different instance of the same user.
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user_1_from_db = User.objects.get(pk=user_1.pk)
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self.assertSequenceEqual(user_1_from_db.article_set.all(), [self.a3])
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user_1_from_db.username = "Paul"
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self.a3.authors.set([user_2.username])
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user_1_from_db.save()
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# Assign a different article.
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self.a4.authors.add(user_1_from_db.username)
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self.assertSequenceEqual(user_1_from_db.article_set.all(), [self.a4])
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# Refresh the instance with an evaluated related manager.
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user_1.refresh_from_db()
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self.assertEqual(user_1.username, "Paul")
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self.assertSequenceEqual(user_1.article_set.all(), [self.a4])
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def test_add_remove_invalid_type(self):
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msg = "Field 'id' expected a number but got 'invalid'."
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for method in ["add", "remove"]:
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with self.subTest(method), self.assertRaisesMessage(ValueError, msg):
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getattr(self.a1.publications, method)("invalid")
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def test_reverse_add(self):
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# Adding via the 'other' end of an m2m
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a5 = Article(headline="NASA finds intelligent life on Mars")
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a5.save()
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self.p2.article_set.add(a5)
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, a5, self.a2, self.a4],
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)
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self.assertSequenceEqual(a5.publications.all(), [self.p2])
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# Adding via the other end using keywords
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a6 = self.p2.article_set.create(headline="Carbon-free diet works wonders")
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[a6, self.a3, a5, self.a2, self.a4],
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)
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a6 = self.p2.article_set.all()[3]
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self.assertSequenceEqual(
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a6.publications.all(),
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[self.p4, self.p2, self.p3, self.p1],
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)
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@skipUnlessDBFeature("supports_ignore_conflicts")
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def test_fast_add_ignore_conflicts(self):
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"""
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A single query is necessary to add auto-created through instances if
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the database backend supports bulk_create(ignore_conflicts) and no
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m2m_changed signals receivers are connected.
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"""
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with self.assertNumQueries(1):
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self.a1.publications.add(self.p1, self.p2)
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@skipIfDBFeature("supports_ignore_conflicts")
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def test_add_existing_different_type(self):
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# A single SELECT query is necessary to compare existing values to the
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# provided one; no INSERT should be attempted.
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with self.assertNumQueries(1):
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self.a1.publications.add(str(self.p1.pk))
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self.assertEqual(self.a1.publications.get(), self.p1)
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@skipUnlessDBFeature("supports_ignore_conflicts")
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def test_slow_add_ignore_conflicts(self):
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manager_cls = self.a1.publications.__class__
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# Simulate a race condition between the missing ids retrieval and
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# the bulk insertion attempt.
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missing_target_ids = {self.p1.id}
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# Disable fast-add to test the case where the slow add path is taken.
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add_plan = (True, False, False)
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with mock.patch.object(
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manager_cls, "_get_missing_target_ids", return_value=missing_target_ids
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) as mocked:
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with mock.patch.object(manager_cls, "_get_add_plan", return_value=add_plan):
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self.a1.publications.add(self.p1)
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mocked.assert_called_once()
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def test_related_sets(self):
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# Article objects have access to their related Publication objects.
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self.assertSequenceEqual(self.a1.publications.all(), [self.p1])
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self.assertSequenceEqual(
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self.a2.publications.all(),
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[self.p4, self.p2, self.p3, self.p1],
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)
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# Publication objects have access to their related Article objects.
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, self.a2, self.a4],
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)
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self.assertSequenceEqual(
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self.p1.article_set.all(),
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[self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Publication.objects.get(id=self.p4.id).article_set.all(),
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[self.a2],
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)
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def test_selects(self):
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# We can perform kwarg queries across m2m relationships
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self.assertSequenceEqual(
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Article.objects.filter(publications__id__exact=self.p1.id),
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[self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Article.objects.filter(publications__pk=self.p1.id),
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[self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Article.objects.filter(publications=self.p1.id),
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[self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Article.objects.filter(publications=self.p1),
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[self.a1, self.a2],
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)
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self.assertSequenceEqual(
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Article.objects.filter(publications__title__startswith="Science"),
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[self.a3, self.a2, self.a2, self.a4],
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)
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self.assertSequenceEqual(
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Article.objects.filter(
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publications__title__startswith="Science"
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).distinct(),
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[self.a3, self.a2, self.a4],
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)
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# The count() function respects distinct() as well.
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self.assertEqual(
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Article.objects.filter(publications__title__startswith="Science").count(), 4
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)
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self.assertEqual(
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Article.objects.filter(publications__title__startswith="Science")
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.distinct()
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.count(),
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3,
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)
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self.assertSequenceEqual(
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Article.objects.filter(
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publications__in=[self.p1.id, self.p2.id]
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).distinct(),
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[self.a1, self.a3, self.a2, self.a4],
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)
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self.assertSequenceEqual(
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Article.objects.filter(publications__in=[self.p1.id, self.p2]).distinct(),
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[self.a1, self.a3, self.a2, self.a4],
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)
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self.assertSequenceEqual(
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Article.objects.filter(publications__in=[self.p1, self.p2]).distinct(),
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[self.a1, self.a3, self.a2, self.a4],
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)
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# Excluding a related item works as you would expect, too (although the SQL
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# involved is a little complex).
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self.assertSequenceEqual(
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Article.objects.exclude(publications=self.p2),
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[self.a1],
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)
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def test_reverse_selects(self):
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# Reverse m2m queries are supported (i.e., starting at the table that
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# doesn't have a ManyToManyField).
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python_journal = [self.p1]
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self.assertSequenceEqual(
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Publication.objects.filter(id__exact=self.p1.id), python_journal
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)
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self.assertSequenceEqual(
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Publication.objects.filter(pk=self.p1.id), python_journal
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article__headline__startswith="NASA"),
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[self.p4, self.p2, self.p2, self.p3, self.p1],
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article__id__exact=self.a1.id), python_journal
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article__pk=self.a1.id), python_journal
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article=self.a1.id), python_journal
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article=self.a1), python_journal
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article__in=[self.a1.id, self.a2.id]).distinct(),
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[self.p4, self.p2, self.p3, self.p1],
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article__in=[self.a1.id, self.a2]).distinct(),
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[self.p4, self.p2, self.p3, self.p1],
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)
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self.assertSequenceEqual(
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Publication.objects.filter(article__in=[self.a1, self.a2]).distinct(),
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[self.p4, self.p2, self.p3, self.p1],
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)
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def test_delete(self):
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# If we delete a Publication, its Articles won't be able to access it.
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self.p1.delete()
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self.assertSequenceEqual(
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Publication.objects.all(),
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[self.p4, self.p2, self.p3],
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)
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self.assertSequenceEqual(self.a1.publications.all(), [])
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# If we delete an Article, its Publications won't be able to access it.
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self.a2.delete()
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self.assertSequenceEqual(
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Article.objects.all(),
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[self.a1, self.a3, self.a4],
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)
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, self.a4],
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)
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def test_bulk_delete(self):
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# Bulk delete some Publications - references to deleted publications should go
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Publication.objects.filter(title__startswith="Science").delete()
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self.assertSequenceEqual(
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Publication.objects.all(),
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[self.p4, self.p1],
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)
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self.assertSequenceEqual(
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Article.objects.all(),
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[self.a1, self.a3, self.a2, self.a4],
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)
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self.assertSequenceEqual(
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self.a2.publications.all(),
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[self.p4, self.p1],
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)
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# Bulk delete some articles - references to deleted objects should go
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q = Article.objects.filter(headline__startswith="Django")
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self.assertSequenceEqual(q, [self.a1])
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q.delete()
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# After the delete, the QuerySet cache needs to be cleared,
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# and the referenced objects should be gone
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self.assertSequenceEqual(q, [])
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self.assertSequenceEqual(self.p1.article_set.all(), [self.a2])
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def test_remove(self):
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# Removing publication from an article:
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, self.a2, self.a4],
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)
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self.a4.publications.remove(self.p2)
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, self.a2],
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)
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self.assertSequenceEqual(self.a4.publications.all(), [])
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# And from the other end
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self.p2.article_set.remove(self.a3)
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self.assertSequenceEqual(self.p2.article_set.all(), [self.a2])
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self.assertSequenceEqual(self.a3.publications.all(), [])
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def test_set(self):
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self.p2.article_set.set([self.a4, self.a3])
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, self.a4],
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)
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self.assertSequenceEqual(self.a4.publications.all(), [self.p2])
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self.a4.publications.set([self.p3.id])
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self.assertSequenceEqual(self.p2.article_set.all(), [self.a3])
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self.assertSequenceEqual(self.a4.publications.all(), [self.p3])
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self.p2.article_set.set([])
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self.assertSequenceEqual(self.p2.article_set.all(), [])
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self.a4.publications.set([])
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self.assertSequenceEqual(self.a4.publications.all(), [])
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self.p2.article_set.set([self.a4, self.a3], clear=True)
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, self.a4],
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)
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self.assertSequenceEqual(self.a4.publications.all(), [self.p2])
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self.a4.publications.set([self.p3.id], clear=True)
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self.assertSequenceEqual(self.p2.article_set.all(), [self.a3])
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self.assertSequenceEqual(self.a4.publications.all(), [self.p3])
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self.p2.article_set.set([], clear=True)
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self.assertSequenceEqual(self.p2.article_set.all(), [])
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self.a4.publications.set([], clear=True)
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self.assertSequenceEqual(self.a4.publications.all(), [])
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def test_set_existing_different_type(self):
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# Existing many-to-many relations remain the same for values provided
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# with a different type.
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ids = set(
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Publication.article_set.through.objects.filter(
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article__in=[self.a4, self.a3],
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publication=self.p2,
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).values_list("id", flat=True)
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)
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self.p2.article_set.set([str(self.a4.pk), str(self.a3.pk)])
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new_ids = set(
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Publication.article_set.through.objects.filter(
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publication=self.p2,
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).values_list("id", flat=True)
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)
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self.assertEqual(ids, new_ids)
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def test_assign_forward(self):
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msg = (
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"Direct assignment to the reverse side of a many-to-many set is "
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"prohibited. Use article_set.set() instead."
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)
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with self.assertRaisesMessage(TypeError, msg):
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self.p2.article_set = [self.a4, self.a3]
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def test_assign_reverse(self):
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msg = (
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"Direct assignment to the forward side of a many-to-many "
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"set is prohibited. Use publications.set() instead."
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)
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with self.assertRaisesMessage(TypeError, msg):
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self.a1.publications = [self.p1, self.p2]
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def test_assign(self):
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# Relation sets can be assigned using set().
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self.p2.article_set.set([self.a4, self.a3])
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self.assertSequenceEqual(
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self.p2.article_set.all(),
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[self.a3, self.a4],
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)
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self.assertSequenceEqual(self.a4.publications.all(), [self.p2])
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self.a4.publications.set([self.p3.id])
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self.assertSequenceEqual(self.p2.article_set.all(), [self.a3])
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self.assertSequenceEqual(self.a4.publications.all(), [self.p3])
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# An alternate to calling clear() is to set an empty set.
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self.p2.article_set.set([])
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self.assertSequenceEqual(self.p2.article_set.all(), [])
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self.a4.publications.set([])
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self.assertSequenceEqual(self.a4.publications.all(), [])
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def test_assign_ids(self):
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# Relation sets can also be set using primary key values
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|
self.p2.article_set.set([self.a4.id, self.a3.id])
|
|
self.assertSequenceEqual(
|
|
self.p2.article_set.all(),
|
|
[self.a3, self.a4],
|
|
)
|
|
self.assertSequenceEqual(self.a4.publications.all(), [self.p2])
|
|
self.a4.publications.set([self.p3.id])
|
|
self.assertSequenceEqual(self.p2.article_set.all(), [self.a3])
|
|
self.assertSequenceEqual(self.a4.publications.all(), [self.p3])
|
|
|
|
def test_forward_assign_with_queryset(self):
|
|
# Querysets used in m2m assignments are pre-evaluated so their value
|
|
# isn't affected by the clearing operation in ManyRelatedManager.set()
|
|
# (#19816).
|
|
self.a1.publications.set([self.p1, self.p2])
|
|
|
|
qs = self.a1.publications.filter(title="The Python Journal")
|
|
self.a1.publications.set(qs)
|
|
|
|
self.assertEqual(1, self.a1.publications.count())
|
|
self.assertEqual(1, qs.count())
|
|
|
|
def test_reverse_assign_with_queryset(self):
|
|
# Querysets used in M2M assignments are pre-evaluated so their value
|
|
# isn't affected by the clearing operation in ManyRelatedManager.set()
|
|
# (#19816).
|
|
self.p1.article_set.set([self.a1, self.a2])
|
|
|
|
qs = self.p1.article_set.filter(
|
|
headline="Django lets you build web apps easily"
|
|
)
|
|
self.p1.article_set.set(qs)
|
|
|
|
self.assertEqual(1, self.p1.article_set.count())
|
|
self.assertEqual(1, qs.count())
|
|
|
|
def test_clear(self):
|
|
# Relation sets can be cleared:
|
|
self.p2.article_set.clear()
|
|
self.assertSequenceEqual(self.p2.article_set.all(), [])
|
|
self.assertSequenceEqual(self.a4.publications.all(), [])
|
|
|
|
# And you can clear from the other end
|
|
self.p2.article_set.add(self.a3, self.a4)
|
|
self.assertSequenceEqual(
|
|
self.p2.article_set.all(),
|
|
[self.a3, self.a4],
|
|
)
|
|
self.assertSequenceEqual(self.a4.publications.all(), [self.p2])
|
|
self.a4.publications.clear()
|
|
self.assertSequenceEqual(self.a4.publications.all(), [])
|
|
self.assertSequenceEqual(self.p2.article_set.all(), [self.a3])
|
|
|
|
def test_clear_after_prefetch(self):
|
|
a4 = Article.objects.prefetch_related("publications").get(id=self.a4.id)
|
|
self.assertSequenceEqual(a4.publications.all(), [self.p2])
|
|
a4.publications.clear()
|
|
self.assertSequenceEqual(a4.publications.all(), [])
|
|
|
|
def test_remove_after_prefetch(self):
|
|
a4 = Article.objects.prefetch_related("publications").get(id=self.a4.id)
|
|
self.assertSequenceEqual(a4.publications.all(), [self.p2])
|
|
a4.publications.remove(self.p2)
|
|
self.assertSequenceEqual(a4.publications.all(), [])
|
|
|
|
def test_add_after_prefetch(self):
|
|
a4 = Article.objects.prefetch_related("publications").get(id=self.a4.id)
|
|
self.assertEqual(a4.publications.count(), 1)
|
|
a4.publications.add(self.p1)
|
|
self.assertEqual(a4.publications.count(), 2)
|
|
|
|
def test_create_after_prefetch(self):
|
|
a4 = Article.objects.prefetch_related("publications").get(id=self.a4.id)
|
|
self.assertSequenceEqual(a4.publications.all(), [self.p2])
|
|
p5 = a4.publications.create(title="Django beats")
|
|
self.assertCountEqual(a4.publications.all(), [self.p2, p5])
|
|
|
|
def test_set_after_prefetch(self):
|
|
a4 = Article.objects.prefetch_related("publications").get(id=self.a4.id)
|
|
self.assertEqual(a4.publications.count(), 1)
|
|
a4.publications.set([self.p2, self.p1])
|
|
self.assertEqual(a4.publications.count(), 2)
|
|
a4.publications.set([self.p1])
|
|
self.assertEqual(a4.publications.count(), 1)
|
|
|
|
def test_add_then_remove_after_prefetch(self):
|
|
a4 = Article.objects.prefetch_related("publications").get(id=self.a4.id)
|
|
self.assertEqual(a4.publications.count(), 1)
|
|
a4.publications.add(self.p1)
|
|
self.assertEqual(a4.publications.count(), 2)
|
|
a4.publications.remove(self.p1)
|
|
self.assertSequenceEqual(a4.publications.all(), [self.p2])
|
|
|
|
def test_inherited_models_selects(self):
|
|
"""
|
|
#24156 - Objects from child models where the parent's m2m field uses
|
|
related_name='+' should be retrieved correctly.
|
|
"""
|
|
a = InheritedArticleA.objects.create()
|
|
b = InheritedArticleB.objects.create()
|
|
a.publications.add(self.p1, self.p2)
|
|
self.assertSequenceEqual(
|
|
a.publications.all(),
|
|
[self.p2, self.p1],
|
|
)
|
|
self.assertSequenceEqual(b.publications.all(), [])
|
|
b.publications.add(self.p3)
|
|
self.assertSequenceEqual(
|
|
a.publications.all(),
|
|
[self.p2, self.p1],
|
|
)
|
|
self.assertSequenceEqual(b.publications.all(), [self.p3])
|
|
|
|
def test_custom_default_manager_exists_count(self):
|
|
a5 = Article.objects.create(headline="deleted")
|
|
a5.publications.add(self.p2)
|
|
self.assertEqual(self.p2.article_set.count(), self.p2.article_set.all().count())
|
|
self.assertEqual(
|
|
self.p3.article_set.exists(), self.p3.article_set.all().exists()
|
|
)
|