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from django.core.exceptions import FieldError
from django.test import TestCase
from .models.default_related_name import Author, Book, Editor
class DefaultRelatedNameTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.author = Author.objects.create(first_name="Dave", last_name="Loper")
cls.editor = Editor.objects.create(
name="Test Editions", bestselling_author=cls.author
)
cls.book = Book.objects.create(title="Test Book", editor=cls.editor)
cls.book.authors.add(cls.author)
def test_no_default_related_name(self):
self.assertEqual(list(self.author.editor_set.all()), [self.editor])
def test_default_related_name(self):
self.assertEqual(list(self.author.books.all()), [self.book])
def test_default_related_name_in_queryset_lookup(self):
self.assertEqual(Author.objects.get(books=self.book), self.author)
def test_model_name_not_available_in_queryset_lookup(self):
msg = "Cannot resolve keyword 'book' into field."
with self.assertRaisesMessage(FieldError, msg):
Author.objects.get(book=self.book)
def test_related_name_overrides_default_related_name(self):
self.assertEqual(list(self.editor.edited_books.all()), [self.book])
def test_inheritance(self):
# model_options is the name of the application for this test.
self.assertEqual(list(self.book.model_options_bookstores.all()), [])
def test_inheritance_with_overridden_default_related_name(self):
self.assertEqual(list(self.book.editor_stores.all()), [])
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