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from django.test import TestCase
from models import PersonManager, PublishedBookManager
from models import Person, Book, Car
class CustomManagersTestCase(TestCase):
fixtures = ['custom_managers_testdata.json']
def test_related_manager(self):
self.assertQuerysetEqual(Person.objects.get_fun_people(),
['<Person: Bugs Bunny>'])
# The RelatedManager used on the 'books' descriptor extends
# the default manager
p2 = Person.objects.get(first_name='Droopy')
self.assertTrue(isinstance(p2.books, PublishedBookManager))
# The default manager, "objects", doesn't exist, because a
# custom one was provided.
self.assertRaises(AttributeError,
getattr,
Book, 'objects')
# The RelatedManager used on the 'authors' descriptor extends
# the default manager
b2 = Book(title='How to be smart',
author='Albert Einstein',
is_published=False)
b2.save()
self.assertTrue(isinstance(b2.authors, PersonManager))
self.assertQuerysetEqual(Book.published_objects.all(),
['<Book: How to program>'])
self.assertQuerysetEqual(Car.cars.order_by('name'),
['<Car: Corvette>', '<Car: Neon>'])
self.assertQuerysetEqual(Car.fast_cars.all(),
['<Car: Corvette>'])
# Each model class gets a "_default_manager" attribute, which
# is a reference to the first manager defined in the class. In
# this case, it's "cars".
self.assertQuerysetEqual(Car._default_manager.order_by('name'),
['<Car: Corvette>', '<Car: Neon>'])
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