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Added sample test code to reproduce issue #68 #250

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Added sample test code to reproduce issue #68 #250

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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -15,3 +15,4 @@ build/
dist/
docs/_build/
htmlcov/
venv/
19 changes: 19 additions & 0 deletions polymorphic/tests.py
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Expand Up @@ -428,6 +428,14 @@ class DateModel(PolymorphicModel):
date = models.DateTimeField()


class PrefetchRelatedA(PolymorphicModel):
pass


class PrefetchRelatedB(models.Model):
links = models.ManyToManyField(PrefetchRelatedA)


class PolymorphicTests(TestCase):
"""
The test suite
Expand Down Expand Up @@ -1325,6 +1333,17 @@ def func():
# Ensure no queries are made using the default database.
self.assertNumQueries(0, func)

def test_prefetch_related_behaves_normally_with_polymorphic_model(self):
"""See #68"""
b1 = PrefetchRelatedB.objects.create()
b2 = PrefetchRelatedB.objects.create()
a = b1.links.create()
b2.links.add(a)

qs = PrefetchRelatedB.objects.prefetch_related('links')
for obj in qs:
self.assertEqual(len(obj.links.all()), 1)


def qrepr(data):
"""
Expand Down