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