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Refs #20625 -- Forwardported tests and release notes for queryset chaining fix.
The issue was fixed on master due to the removal of ValuesQuerySet.
Partial forwardport of 7d471fe662
from stable/1.8.x
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@ -36,3 +36,6 @@ Bugfixes
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* Changed ``Count`` queries to execute ``COUNT(*)`` instead of ``COUNT('*')``
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as versions of Django before 1.8 did (:ticket:`25377`). This may fix a
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performance regression on some databases.
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* Fixed custom queryset chaining with ``values()`` and ``values_list()``
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(:ticket:`20625`).
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@ -76,6 +76,10 @@ class CustomManagerTests(TestCase):
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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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self.assertIsInstance(queryset.values(), CustomQuerySet)
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self.assertIsInstance(queryset.values().values(), CustomQuerySet)
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self.assertIsInstance(queryset.values_list().values(), CustomQuerySet)
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def test_init_args(self):
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"""
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The custom manager __init__() argument has been set.
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