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from __future__ import unicode_literals
from django.test import TestCase
from django.utils import six
from .models import Person, Book, Car, PersonManager, PublishedBookManager
class CustomManagerTests(TestCase):
def test_manager(self):
p1 = Person.objects.create(first_name="Bugs", last_name="Bunny", fun=True)
p2 = Person.objects.create(first_name="Droopy", last_name="Dog", fun=False)
# Test a custom `Manager` method.
self.assertQuerysetEqual(
Person.objects.get_fun_people(), [
"Bugs Bunny"
],
six.text_type
)
# Test that the methods of a custom `QuerySet` are properly
# copied onto the default `Manager`.
for manager in ['custom_queryset_default_manager',
'custom_queryset_custom_manager']:
manager = getattr(Person, manager)
# Copy public methods.
manager.public_method()
# Don't copy private methods.
with self.assertRaises(AttributeError):
manager._private_method()
# Copy methods with `manager=True` even if they are private.
manager._optin_private_method()
# Don't copy methods with `manager=False` even if they are public.
with self.assertRaises(AttributeError):
manager.optout_public_method()
# Test that the overridden method is called.
queryset = manager.filter()
self.assertQuerysetEqual(queryset, ["Bugs Bunny"], six.text_type)
self.assertEqual(queryset._filter_CustomQuerySet, True)
# Test that specialized querysets inherit from our custom queryset.
queryset = manager.values_list('first_name', flat=True).filter()
self.assertEqual(list(queryset), [six.text_type("Bugs")])
self.assertEqual(queryset._filter_CustomQuerySet, True)
# Test that the custom manager `__init__()` argument has been set.
self.assertEqual(Person.custom_queryset_custom_manager.init_arg, 'hello')
# Test that the custom manager method is only available on the manager.
Person.custom_queryset_custom_manager.manager_only()
with self.assertRaises(AttributeError):
Person.custom_queryset_custom_manager.all().manager_only()
# Test that the queryset method doesn't override the custom manager method.
queryset = Person.custom_queryset_custom_manager.filter()
self.assertQuerysetEqual(queryset, ["Bugs Bunny"], six.text_type)
self.assertEqual(queryset._filter_CustomManager, True)
# The RelatedManager used on the 'books' descriptor extends the default
# manager
self.assertIsInstance(p2.books, PublishedBookManager)
b1 = Book.published_objects.create(
title="How to program", author="Rodney Dangerfield", is_published=True
)
b2 = Book.published_objects.create(
title="How to be smart", author="Albert Einstein", is_published=False
)
# The default manager, "objects", doesn't exist, because a custom one
# was provided.
self.assertRaises(AttributeError, lambda: Book.objects)
# The RelatedManager used on the 'authors' descriptor extends the
# default manager
self.assertIsInstance(b2.authors, PersonManager)
self.assertQuerysetEqual(
Book.published_objects.all(), [
"How to program",
],
lambda b: b.title
)
c1 = Car.cars.create(name="Corvette", mileage=21, top_speed=180)
c2 = Car.cars.create(name="Neon", mileage=31, top_speed=100)
self.assertQuerysetEqual(
Car.cars.order_by("name"), [
"Corvette",
"Neon",
],
lambda c: c.name
)
self.assertQuerysetEqual(
Car.fast_cars.all(), [
"Corvette",
],
lambda c: c.name
)
# 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"), [
"Corvette",
"Neon",
],
lambda c: c.name
)
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