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Diffstat (limited to 'parts/django/tests/modeltests/many_to_many/tests.py')
| -rw-r--r-- | parts/django/tests/modeltests/many_to_many/tests.py | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/parts/django/tests/modeltests/many_to_many/tests.py b/parts/django/tests/modeltests/many_to_many/tests.py new file mode 100644 index 0000000..39fe581 --- /dev/null +++ b/parts/django/tests/modeltests/many_to_many/tests.py @@ -0,0 +1,384 @@ +from django.test import TestCase +from models import Article, Publication + +class ManyToManyTests(TestCase): + + def setUp(self): + # Create a couple of Publications. + self.p1 = Publication.objects.create(id=None, title='The Python Journal') + self.p2 = Publication.objects.create(id=None, title='Science News') + self.p3 = Publication.objects.create(id=None, title='Science Weekly') + self.p4 = Publication.objects.create(title='Highlights for Children') + + self.a1 = Article.objects.create(id=None, headline='Django lets you build Web apps easily') + self.a1.publications.add(self.p1) + + self.a2 = Article.objects.create(id=None, headline='NASA uses Python') + self.a2.publications.add(self.p1, self.p2, self.p3, self.p4) + + self.a3 = Article.objects.create(headline='NASA finds intelligent life on Earth') + self.a3.publications.add(self.p2) + + self.a4 = Article.objects.create(headline='Oxygen-free diet works wonders') + self.a4.publications.add(self.p2) + + def test_add(self): + # Create an Article. + a5 = Article(id=None, headline='Django lets you reate Web apps easily') + # You can't associate it with a Publication until it's been saved. + self.assertRaises(ValueError, getattr, a5, 'publications') + # Save it! + a5.save() + # Associate the Article with a Publication. + a5.publications.add(self.p1) + self.assertQuerysetEqual(a5.publications.all(), + ['<Publication: The Python Journal>']) + # Create another Article, and set it to appear in both Publications. + a6 = Article(id=None, headline='ESA uses Python') + a6.save() + a6.publications.add(self.p1, self.p2) + a6.publications.add(self.p3) + # Adding a second time is OK + a6.publications.add(self.p3) + self.assertQuerysetEqual(a6.publications.all(), + [ + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + + # Adding an object of the wrong type raises TypeError + self.assertRaises(TypeError, a6.publications.add, a5) + # Add a Publication directly via publications.add by using keyword arguments. + p4 = a6.publications.create(title='Highlights for Adults') + self.assertQuerysetEqual(a6.publications.all(), + [ + '<Publication: Highlights for Adults>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + + def test_reverse_add(self): + # Adding via the 'other' end of an m2m + a5 = Article(headline='NASA finds intelligent life on Mars') + a5.save() + self.p2.article_set.add(a5) + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA finds intelligent life on Mars>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual(a5.publications.all(), + ['<Publication: Science News>']) + + # Adding via the other end using keywords + new_article = self.p2.article_set.create(headline='Carbon-free diet works wonders') + self.assertQuerysetEqual( + self.p2.article_set.all(), + [ + '<Article: Carbon-free diet works wonders>', + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA finds intelligent life on Mars>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + a6 = self.p2.article_set.all()[3] + self.assertQuerysetEqual(a6.publications.all(), + [ + '<Publication: Highlights for Children>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + + def test_related_sets(self): + # Article objects have access to their related Publication objects. + self.assertQuerysetEqual(self.a1.publications.all(), + ['<Publication: The Python Journal>']) + self.assertQuerysetEqual(self.a2.publications.all(), + [ + '<Publication: Highlights for Children>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + # Publication objects have access to their related Article objects. + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual(self.p1.article_set.all(), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA uses Python>', + ]) + self.assertQuerysetEqual(Publication.objects.get(id=self.p4.id).article_set.all(), + ['<Article: NASA uses Python>']) + + def test_selects(self): + # We can perform kwarg queries across m2m relationships + self.assertQuerysetEqual( + Article.objects.filter(publications__id__exact=self.p1.id), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA uses Python>', + ]) + self.assertQuerysetEqual( + Article.objects.filter(publications__pk=self.p1.id), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA uses Python>', + ]) + self.assertQuerysetEqual( + Article.objects.filter(publications=self.p1.id), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA uses Python>', + ]) + self.assertQuerysetEqual( + Article.objects.filter(publications=self.p1), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA uses Python>', + ]) + self.assertQuerysetEqual( + Article.objects.filter(publications__title__startswith="Science"), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual( + Article.objects.filter(publications__title__startswith="Science").distinct(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + + # The count() function respects distinct() as well. + self.assertEqual(Article.objects.filter(publications__title__startswith="Science").count(), 4) + self.assertEqual(Article.objects.filter(publications__title__startswith="Science").distinct().count(), 3) + self.assertQuerysetEqual( + Article.objects.filter(publications__in=[self.p1.id,self.p2.id]).distinct(), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual( + Article.objects.filter(publications__in=[self.p1.id,self.p2]).distinct(), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual( + Article.objects.filter(publications__in=[self.p1,self.p2]).distinct(), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + + # Excluding a related item works as you would expect, too (although the SQL + # involved is a little complex). + self.assertQuerysetEqual(Article.objects.exclude(publications=self.p2), + ['<Article: Django lets you build Web apps easily>']) + + def test_reverse_selects(self): + # Reverse m2m queries are supported (i.e., starting at the table that + # doesn't have a ManyToManyField). + self.assertQuerysetEqual(Publication.objects.filter(id__exact=self.p1.id), + ['<Publication: The Python Journal>']) + self.assertQuerysetEqual(Publication.objects.filter(pk=self.p1.id), + ['<Publication: The Python Journal>']) + self.assertQuerysetEqual( + Publication.objects.filter(article__headline__startswith="NASA"), + [ + '<Publication: Highlights for Children>', + '<Publication: Science News>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + self.assertQuerysetEqual(Publication.objects.filter(article__id__exact=self.a1.id), + ['<Publication: The Python Journal>']) + self.assertQuerysetEqual(Publication.objects.filter(article__pk=self.a1.id), + ['<Publication: The Python Journal>']) + self.assertQuerysetEqual(Publication.objects.filter(article=self.a1.id), + ['<Publication: The Python Journal>']) + self.assertQuerysetEqual(Publication.objects.filter(article=self.a1), + ['<Publication: The Python Journal>']) + + self.assertQuerysetEqual( + Publication.objects.filter(article__in=[self.a1.id,self.a2.id]).distinct(), + [ + '<Publication: Highlights for Children>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + self.assertQuerysetEqual( + Publication.objects.filter(article__in=[self.a1.id,self.a2]).distinct(), + [ + '<Publication: Highlights for Children>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + self.assertQuerysetEqual( + Publication.objects.filter(article__in=[self.a1,self.a2]).distinct(), + [ + '<Publication: Highlights for Children>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + '<Publication: The Python Journal>', + ]) + + def test_delete(self): + # If we delete a Publication, its Articles won't be able to access it. + self.p1.delete() + self.assertQuerysetEqual(Publication.objects.all(), + [ + '<Publication: Highlights for Children>', + '<Publication: Science News>', + '<Publication: Science Weekly>', + ]) + self.assertQuerysetEqual(self.a1.publications.all(), []) + # If we delete an Article, its Publications won't be able to access it. + self.a2.delete() + self.assertQuerysetEqual(Article.objects.all(), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA finds intelligent life on Earth>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: Oxygen-free diet works wonders>', + ]) + + def test_bulk_delete(self): + # Bulk delete some Publications - references to deleted publications should go + Publication.objects.filter(title__startswith='Science').delete() + self.assertQuerysetEqual(Publication.objects.all(), + [ + '<Publication: Highlights for Children>', + '<Publication: The Python Journal>', + ]) + self.assertQuerysetEqual(Article.objects.all(), + [ + '<Article: Django lets you build Web apps easily>', + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual(self.a2.publications.all(), + [ + '<Publication: Highlights for Children>', + '<Publication: The Python Journal>', + ]) + + # Bulk delete some articles - references to deleted objects should go + q = Article.objects.filter(headline__startswith='Django') + self.assertQuerysetEqual(q, ['<Article: Django lets you build Web apps easily>']) + q.delete() + # After the delete, the QuerySet cache needs to be cleared, + # and the referenced objects should be gone + self.assertQuerysetEqual(q, []) + self.assertQuerysetEqual(self.p1.article_set.all(), + ['<Article: NASA uses Python>']) + + def test_remove(self): + # Removing publication from an article: + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.a4.publications.remove(self.p2) + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: NASA uses Python>', + ]) + self.assertQuerysetEqual(self.a4.publications.all(), []) + # And from the other end + self.p2.article_set.remove(self.a3) + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA uses Python>', + ]) + self.assertQuerysetEqual(self.a3.publications.all(), []) + + def test_assign(self): + # Relation sets can be assigned. Assignment clears any existing set members + self.p2.article_set = [self.a4, self.a3] + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual(self.a4.publications.all(), + ['<Publication: Science News>']) + self.a4.publications = [self.p3.id] + self.assertQuerysetEqual(self.p2.article_set.all(), + ['<Article: NASA finds intelligent life on Earth>']) + self.assertQuerysetEqual(self.a4.publications.all(), + ['<Publication: Science Weekly>']) + + # An alternate to calling clear() is to assign the empty set + self.p2.article_set = [] + self.assertQuerysetEqual(self.p2.article_set.all(), []) + self.a4.publications = [] + self.assertQuerysetEqual(self.a4.publications.all(), []) + + def test_assign_ids(self): + # Relation sets can also be set using primary key values + self.p2.article_set = [self.a4.id, self.a3.id] + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual(self.a4.publications.all(), + ['<Publication: Science News>']) + self.a4.publications = [self.p3.id] + self.assertQuerysetEqual(self.p2.article_set.all(), + ['<Article: NASA finds intelligent life on Earth>']) + self.assertQuerysetEqual(self.a4.publications.all(), + ['<Publication: Science Weekly>']) + + def test_clear(self): + # Relation sets can be cleared: + self.p2.article_set.clear() + self.assertQuerysetEqual(self.p2.article_set.all(), []) + self.assertQuerysetEqual(self.a4.publications.all(), []) + + # And you can clear from the other end + self.p2.article_set.add(self.a3, self.a4) + self.assertQuerysetEqual(self.p2.article_set.all(), + [ + '<Article: NASA finds intelligent life on Earth>', + '<Article: Oxygen-free diet works wonders>', + ]) + self.assertQuerysetEqual(self.a4.publications.all(), + [ + '<Publication: Science News>', + ]) + self.a4.publications.clear() + self.assertQuerysetEqual(self.a4.publications.all(), []) + self.assertQuerysetEqual(self.p2.article_set.all(), + ['<Article: NASA finds intelligent life on Earth>']) |