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Code Issues 32 Releases Wiki Activity

Fixed #32682 -- Made admin changelist use Exists() instead of distinct() for preventing duplicates.

Browse Source 
Thanks Zain Patel for the report and Simon Charette for reviews.

The exception introduced in 6307c3f1a1
revealed a possible data loss issue in the admin.
This commit is contained in:
Mariusz Felisiak
2021-04-26 09:22:46 +02:00
parent cd74aad90e
commit 1871182031
3 changed files with 70 additions and 32 deletions
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73
tests/admin_changelist/tests.py
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@@ -299,7 +299,7 @@ class ChangeListTests(TestCase):
cl.get_results(request)
self.assertIsInstance(cl.paginator, CustomPaginator)
def test_distinct_for_m2m_in_list_filter(self):
def test_no_duplicates_for_m2m_in_list_filter(self):
"""
Regression test for #13902: When using a ManyToMany in list_filter,
results shouldn't appear more than once. Basic ManyToMany.
@@ -319,8 +319,12 @@ class ChangeListTests(TestCase):
# There's only one Group instance
self.assertEqual(cl.result_count, 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_distinct_for_through_m2m_in_list_filter(self):
def test_no_duplicates_for_through_m2m_in_list_filter(self):
"""
Regression test for #13902: When using a ManyToMany in list_filter,
results shouldn't appear more than once. With an intermediate model.
@@ -339,12 +343,15 @@ class ChangeListTests(TestCase):
# There's only one Group instance
self.assertEqual(cl.result_count, 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_distinct_for_through_m2m_at_second_level_in_list_filter(self):
def test_no_duplicates_for_through_m2m_at_second_level_in_list_filter(self):
"""
When using a ManyToMany in list_filter at the second level behind a
ForeignKey, distinct() must be called and results shouldn't appear more
than once.
ForeignKey, results shouldn't appear more than once.
"""
lead = Musician.objects.create(name='Vox')
band = Group.objects.create(name='The Hype')
@@ -361,8 +368,12 @@ class ChangeListTests(TestCase):
# There's only one Concert instance
self.assertEqual(cl.result_count, 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_distinct_for_inherited_m2m_in_list_filter(self):
def test_no_duplicates_for_inherited_m2m_in_list_filter(self):
"""
Regression test for #13902: When using a ManyToMany in list_filter,
results shouldn't appear more than once. Model managed in the
@@ -382,8 +393,12 @@ class ChangeListTests(TestCase):
# There's only one Quartet instance
self.assertEqual(cl.result_count, 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_distinct_for_m2m_to_inherited_in_list_filter(self):
def test_no_duplicates_for_m2m_to_inherited_in_list_filter(self):
"""
Regression test for #13902: When using a ManyToMany in list_filter,
results shouldn't appear more than once. Target of the relationship
@@ -403,11 +418,15 @@ class ChangeListTests(TestCase):
# There's only one ChordsBand instance
self.assertEqual(cl.result_count, 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_distinct_for_non_unique_related_object_in_list_filter(self):
def test_no_duplicates_for_non_unique_related_object_in_list_filter(self):
"""
Regressions tests for #15819: If a field listed in list_filters
is a non-unique related object, distinct() must be called.
Regressions tests for #15819: If a field listed in list_filters is a
non-unique related object, results shouldn't appear more than once.
"""
parent = Parent.objects.create(name='Mary')
# Two children with the same name
@@ -419,8 +438,12 @@ class ChangeListTests(TestCase):
request.user = self.superuser
cl = m.get_changelist_instance(request)
# Make sure distinct() was called
# Exists() is applied.
self.assertEqual(cl.queryset.count(), 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_changelist_search_form_validation(self):
m = ConcertAdmin(Concert, custom_site)
@@ -438,10 +461,10 @@ class ChangeListTests(TestCase):
self.assertEqual(1, len(messages))
self.assertEqual(error, messages[0])
def test_distinct_for_non_unique_related_object_in_search_fields(self):
def test_no_duplicates_for_non_unique_related_object_in_search_fields(self):
"""
Regressions tests for #15819: If a field listed in search_fields
is a non-unique related object, distinct() must be called.
is a non-unique related object, Exists() must be applied.
"""
parent = Parent.objects.create(name='Mary')
Child.objects.create(parent=parent, name='Danielle')
@@ -452,13 +475,17 @@ class ChangeListTests(TestCase):
request.user = self.superuser
cl = m.get_changelist_instance(request)
# Make sure distinct() was called
# Exists() is applied.
self.assertEqual(cl.queryset.count(), 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_distinct_for_many_to_many_at_second_level_in_search_fields(self):
def test_no_duplicates_for_many_to_many_at_second_level_in_search_fields(self):
"""
When using a ManyToMany in search_fields at the second level behind a
ForeignKey, distinct() must be called and results shouldn't appear more
ForeignKey, Exists() must be applied and results shouldn't appear more
than once.
"""
lead = Musician.objects.create(name='Vox')
@@ -474,6 +501,10 @@ class ChangeListTests(TestCase):
cl = m.get_changelist_instance(request)
# There's only one Concert instance
self.assertEqual(cl.queryset.count(), 1)
# Queryset must be deletable.
self.assertIs(cl.queryset.query.distinct, False)
cl.queryset.delete()
self.assertEqual(cl.queryset.count(), 0)
def test_pk_in_search_fields(self):
band = Group.objects.create(name='The Hype')
@@ -566,23 +597,23 @@ class ChangeListTests(TestCase):
cl = m.get_changelist_instance(request)
self.assertCountEqual(cl.queryset, [abcd])
def test_no_distinct_for_m2m_in_list_filter_without_params(self):
def test_no_exists_for_m2m_in_list_filter_without_params(self):
"""
If a ManyToManyField is in list_filter but isn't in any lookup params,
the changelist's query shouldn't have distinct.
the changelist's query shouldn't have Exists().
"""
m = BandAdmin(Band, custom_site)
for lookup_params in ({}, {'name': 'test'}):
request = self.factory.get('/band/', lookup_params)
request.user = self.superuser
cl = m.get_changelist_instance(request)
self.assertFalse(cl.queryset.query.distinct)
self.assertNotIn(' EXISTS', str(cl.queryset.query))
# A ManyToManyField in params does have distinct applied.
# A ManyToManyField in params does have Exists() applied.
request = self.factory.get('/band/', {'genres': '0'})
request.user = self.superuser
cl = m.get_changelist_instance(request)
self.assertTrue(cl.queryset.query.distinct)
self.assertIn(' EXISTS', str(cl.queryset.query))
def test_pagination(self):
"""