mirror of
https://github.com/django/django.git
synced 2024-12-27 03:25:58 +00:00
ea774bf9a7
git-svn-id: http://code.djangoproject.com/svn/django/trunk@15169 bcc190cf-cafb-0310-a4f2-bffc1f526a37
65 lines
2.5 KiB
Python
65 lines
2.5 KiB
Python
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)
|