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from django.test import TestCase
from .models import Source, Item
class ReverseSingleRelatedTests(TestCase):
"""
Regression tests for an object that cannot access a single related
object due to a restrictive default manager.
"""
def test_reverse_single_related(self):
public_source = Source.objects.create(is_public=True)
public_item = Item.objects.create(source=public_source)
private_source = Source.objects.create(is_public=False)
private_item = Item.objects.create(source=private_source)
# Only one source is available via all() due to the custom default manager.
self.assertQuerysetEqual(
Source.objects.all(),
["<Source: Source object>"]
)
self.assertEqual(public_item.source, public_source)
# Make sure that an item can still access its related source even if the default
# manager doesn't normally allow it.
self.assertEqual(private_item.source, private_source)
# If the manager is marked "use_for_related_fields", it'll get used instead
# of the "bare" queryset. Usually you'd define this as a property on the class,
# but this approximates that in a way that's easier in tests.
Source.objects.use_for_related_fields = True
try:
private_item = Item.objects.get(pk=private_item.pk)
self.assertRaises(Source.DoesNotExist, lambda: private_item.source)
finally:
Source.objects.use_for_related_fields = False
def test_hasattr_single_related(self):
# The exception raised on attribute access when a related object
# doesn't exist should be an instance of a subclass of `AttributeError`
# refs #21563
self.assertFalse(hasattr(Item(), 'source'))
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