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67 lines
2.5 KiB
Python
67 lines
2.5 KiB
Python
from __future__ import absolute_import
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from django.test import TestCase
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from .models import Author, Publisher
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class GetOrCreateTests(TestCase):
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def test_related(self):
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p = Publisher.objects.create(name="Acme Publishing")
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# Create a book through the publisher.
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book, created = p.books.get_or_create(name="The Book of Ed & Fred")
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self.assertTrue(created)
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# The publisher should have one book.
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self.assertEqual(p.books.count(), 1)
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# Try get_or_create again, this time nothing should be created.
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book, created = p.books.get_or_create(name="The Book of Ed & Fred")
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self.assertFalse(created)
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# And the publisher should still have one book.
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self.assertEqual(p.books.count(), 1)
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# Add an author to the book.
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ed, created = book.authors.get_or_create(name="Ed")
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self.assertTrue(created)
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# The book should have one author.
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self.assertEqual(book.authors.count(), 1)
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# Try get_or_create again, this time nothing should be created.
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ed, created = book.authors.get_or_create(name="Ed")
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self.assertFalse(created)
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# And the book should still have one author.
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self.assertEqual(book.authors.count(), 1)
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# Add a second author to the book.
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fred, created = book.authors.get_or_create(name="Fred")
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self.assertTrue(created)
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# The book should have two authors now.
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self.assertEqual(book.authors.count(), 2)
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# Create an Author not tied to any books.
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Author.objects.create(name="Ted")
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# There should be three Authors in total. The book object should have two.
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self.assertEqual(Author.objects.count(), 3)
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self.assertEqual(book.authors.count(), 2)
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# Try creating a book through an author.
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_, created = ed.books.get_or_create(name="Ed's Recipes", publisher=p)
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self.assertTrue(created)
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# Now Ed has two Books, Fred just one.
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self.assertEqual(ed.books.count(), 2)
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self.assertEqual(fred.books.count(), 1)
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# Use the publisher's primary key value instead of a model instance.
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_, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id)
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self.assertTrue(created)
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# Try get_or_create again, this time nothing should be created.
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_, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id)
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self.assertFalse(created)
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# The publisher should have three books.
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self.assertEqual(p.books.count(), 3)
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