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