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Diffstat (limited to 'tests/get_or_create_regress/tests.py')
-rw-r--r-- | tests/get_or_create_regress/tests.py | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/tests/get_or_create_regress/tests.py b/tests/get_or_create_regress/tests.py new file mode 100644 index 0000000000..92c371b6f8 --- /dev/null +++ b/tests/get_or_create_regress/tests.py @@ -0,0 +1,66 @@ +from __future__ import absolute_import + +from django.test import TestCase + +from .models import Author, Publisher + + +class GetOrCreateTests(TestCase): + def test_related(self): + p = Publisher.objects.create(name="Acme Publishing") + # Create a book through the publisher. + book, created = p.books.get_or_create(name="The Book of Ed & Fred") + self.assertTrue(created) + # The publisher should have one book. + self.assertEqual(p.books.count(), 1) + + # Try get_or_create again, this time nothing should be created. + book, created = p.books.get_or_create(name="The Book of Ed & Fred") + self.assertFalse(created) + # And the publisher should still have one book. + self.assertEqual(p.books.count(), 1) + + # Add an author to the book. + ed, created = book.authors.get_or_create(name="Ed") + self.assertTrue(created) + # The book should have one author. + self.assertEqual(book.authors.count(), 1) + + # Try get_or_create again, this time nothing should be created. + ed, created = book.authors.get_or_create(name="Ed") + self.assertFalse(created) + # And the book should still have one author. + self.assertEqual(book.authors.count(), 1) + + # Add a second author to the book. + fred, created = book.authors.get_or_create(name="Fred") + self.assertTrue(created) + + # The book should have two authors now. + self.assertEqual(book.authors.count(), 2) + + # Create an Author not tied to any books. + Author.objects.create(name="Ted") + + # There should be three Authors in total. The book object should have two. + self.assertEqual(Author.objects.count(), 3) + self.assertEqual(book.authors.count(), 2) + + # Try creating a book through an author. + _, created = ed.books.get_or_create(name="Ed's Recipes", publisher=p) + self.assertTrue(created) + + # Now Ed has two Books, Fred just one. + self.assertEqual(ed.books.count(), 2) + self.assertEqual(fred.books.count(), 1) + + # Use the publisher's primary key value instead of a model instance. + _, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id) + self.assertTrue(created) + + # Try get_or_create again, this time nothing should be created. + _, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id) + self.assertFalse(created) + + # The publisher should have three books. + self.assertEqual(p.books.count(), 3) |