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Added a test for QuerySet.select_related() reverse caching.

This commit is contained in:
Anssi Kääriäinen 2017-09-21 14:21:12 -04:00 committed by Tim Graham
parent d612026c37
commit 771e06af2a
1 changed files with 9 additions and 0 deletions
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9
tests/select_related/tests.py
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@ -150,6 +150,15 @@ class SelectRelatedTests(TestCase):
self.assertEqual(obj.parent_1, parent_1)
self.assertEqual(obj.parent_2, parent_2)
def test_reverse_relation_caching(self):
species = Species.objects.select_related('genus').filter(name='melanogaster').first()
with self.assertNumQueries(0):
self.assertEqual(species.genus.name, 'Drosophila')
# The species_set reverse relation isn't cached.
self.assertEqual(species.genus._state.fields_cache, {})
with self.assertNumQueries(1):
self.assertEqual(species.genus.species_set.first().name, 'melanogaster')
def test_select_related_after_values(self):
"""
Running select_related() after calling values() raises a TypeError