Finished

Test Name	Status
test_foreignkey_reverse (prefetch_related.tests.PrefetchLimitTests)	Fail
test_m2m_forward (prefetch_related.tests.PrefetchLimitTests)	Fail
test_m2m_reverse (prefetch_related.tests.PrefetchLimitTests)	Fail
test_reverse_ordering (prefetch_related.tests.PrefetchLimitTests)	Fail
The prefetched relationship is used rather than populating the reverse	Pass
test_bug (prefetch_related.tests.Ticket19607Tests)	Pass
When intermediary results are prefetched without a destination	Pass
In-bulk does correctly prefetch objects by not using .iterator()	Pass
test_prefetch_nullable (prefetch_related.tests.NullableTest)	Pass
test_traverse_nullable (prefetch_related.tests.NullableTest)	Pass
test_bug (prefetch_related.tests.Ticket21410Tests)	Pass
test_bug (prefetch_related.tests.Ticket21760Tests)	Pass
test_m2m_then_m2m (prefetch_related.tests.DefaultManagerTests)	Pass
test_order (prefetch_related.tests.LookupOrderingTest)	Pass
test_foreignkey (prefetch_related.tests.ForeignKeyToFieldTest)	Pass
test_m2m (prefetch_related.tests.ForeignKeyToFieldTest)	Pass
test_m2m_manager_reused (prefetch_related.tests.ForeignKeyToFieldTest)	Pass
test_basic (prefetch_related.tests.RawQuerySetTests)	Pass
test_clear (prefetch_related.tests.RawQuerySetTests)	Pass
test_prefetch_before_raw (prefetch_related.tests.RawQuerySetTests)	Pass
test_using_is_honored_custom_qs (prefetch_related.tests.MultiDbTests)	Pass
test_using_is_honored_fkey (prefetch_related.tests.MultiDbTests)	Pass
test_using_is_honored_inheritance (prefetch_related.tests.MultiDbTests)	Pass
test_using_is_honored_m2m (prefetch_related.tests.MultiDbTests)	Pass
test_child_link_prefetch (prefetch_related.tests.MultiTableInheritanceTest)	Pass
test_foreignkey (prefetch_related.tests.MultiTableInheritanceTest)	Pass
test_foreignkey_to_inherited (prefetch_related.tests.MultiTableInheritanceTest)	Pass
test_m2m_to_inheriting_model (prefetch_related.tests.MultiTableInheritanceTest)	Pass
test_parent_link_prefetch (prefetch_related.tests.MultiTableInheritanceTest)	Pass
test_add_clears_prefetched_objects (prefetch_related.tests.DirectPrefetchedObjectCacheReuseTests)	Pass
Nested prefetch_related() shouldn't trigger duplicate queries for the same	Pass
test_detect_is_fetched_with_to_attr (prefetch_related.tests.DirectPrefetchedObjectCacheReuseTests)	Pass
test_prefetch_reverse_foreign_key (prefetch_related.tests.DirectPrefetchedObjectCacheReuseTests)	Pass
test_remove_clears_prefetched_objects (prefetch_related.tests.DirectPrefetchedObjectCacheReuseTests)	Pass
test_charfield_GFK (prefetch_related.tests.GenericRelationTests)	Pass
test_custom_queryset (prefetch_related.tests.GenericRelationTests)	Pass
test_deleted_GFK (prefetch_related.tests.GenericRelationTests)	Pass
test_generic_relation (prefetch_related.tests.GenericRelationTests)	Pass
test_nullable_GFK (prefetch_related.tests.GenericRelationTests)	Pass
test_prefetch_GFK (prefetch_related.tests.GenericRelationTests)	Pass
test_prefetch_GFK_fk_pk (prefetch_related.tests.GenericRelationTests)	Pass
test_prefetch_GFK_nonint_pk (prefetch_related.tests.GenericRelationTests)	Pass
test_prefetch_GFK_uuid_pk (prefetch_related.tests.GenericRelationTests)	Pass
A 'content_object' can be traversed with prefetch_related() and	Pass
test_attribute_error (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_bool (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_clear (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_count (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_exists (prefetch_related.tests.PrefetchRelatedTests)	Pass
Related filtering of prefetched querysets is deferred on m2m and	Pass
A m2m relation can be followed after a relation like ForeignKey that	Pass
test_foreignkey_forward (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_foreignkey_reverse (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_forward_m2m_to_attr_conflict (prefetch_related.tests.PrefetchRelatedTests)	Pass
Objects retrieved with .get() get the prefetch behavior.	Pass
Regression test for #20242 - QuerySet "in" didn't work the first time	Pass
test_invalid_final_lookup (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_len (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_m2m_forward (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_m2m_prefetching_iterator_with_chunks (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_m2m_prefetching_iterator_without_chunks (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_m2m_prefetching_iterator_without_chunks_warning (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_m2m_reverse (prefetch_related.tests.PrefetchRelatedTests)	Pass
A m2m can be followed through another m2m.	Pass
test_m2m_then_m2m_object_ids (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_m2m_then_reverse_fk_object_ids (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_m2m_then_reverse_one_to_one_object_ids (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_named_values_list (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_onetoone_reverse_no_match (prefetch_related.tests.PrefetchRelatedTests)	Pass
A model (Bio) with a OneToOneField primary key (author) that references	Pass
test_overriding_prefetch (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_prefetch_eq (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_reverse_m2m_to_attr_conflict (prefetch_related.tests.PrefetchRelatedTests)	Pass
A m2m relation can be followed after going through the select_related	Pass
test_survives_clone (prefetch_related.tests.PrefetchRelatedTests)	Pass
test_ambiguous (prefetch_related.tests.CustomPrefetchTests)	Pass
test_custom_qs (prefetch_related.tests.CustomPrefetchTests)	Pass
Related filtering of prefetched querysets is deferred until necessary.	Pass
test_generic_rel (prefetch_related.tests.CustomPrefetchTests)	Pass
test_m2m (prefetch_related.tests.CustomPrefetchTests)	Pass
test_m2m_through_fk (prefetch_related.tests.CustomPrefetchTests)	Pass
test_m2m_through_gfk (prefetch_related.tests.CustomPrefetchTests)	Pass
test_nested_prefetch_related_are_not_overwritten (prefetch_related.tests.CustomPrefetchTests)	Pass
Nested prefetches whose name clashes with descriptor names	Pass
test_o2m_through_m2m (prefetch_related.tests.CustomPrefetchTests)	Pass
test_raw_queryset (prefetch_related.tests.CustomPrefetchTests)	Pass
test_reverse_m2m (prefetch_related.tests.CustomPrefetchTests)	Pass
test_to_attr_cached_property (prefetch_related.tests.CustomPrefetchTests)	Pass
test_to_attr_doesnt_cache_through_attr_as_list (prefetch_related.tests.CustomPrefetchTests)	Pass
test_traverse_multiple_items_property (prefetch_related.tests.CustomPrefetchTests)	Pass
test_traverse_qs (prefetch_related.tests.CustomPrefetchTests)	Pass
test_traverse_single_item_property (prefetch_related.tests.CustomPrefetchTests)	Pass
test_values_queryset (prefetch_related.tests.CustomPrefetchTests)	Pass

Ridges.AI

             with self.assertNumQueries(0):
                 self.assertEqual(person.cached_all_houses, all_houses)
+    def test_prefetch_with_sliced_queryset(self):
+        """
+        Test that Prefetch objects work with sliced querysets.
+        This should allow efficient prefetching of a limited number of related objects.
+        """
+        # Create additional authors to have more than 3 total
+        author5 = Author.objects.create(name="Author5", first_book=self.book1)
+        author6 = Author.objects.create(name="Author6", first_book=self.book1)
+        author7 = Author.objects.create(name="Author7", first_book=self.book1)
+        self.book1.authors.add(author5, author6, author7)
+        # This should work without raising "Cannot filter a query once a slice has been taken"
+        with self.assertNumQueries(2):
+            books = list(
+                Book.objects.prefetch_related(
+                    Prefetch(
+                        "authors",
+                        queryset=Author.objects.all()[:3],  # Sliced queryset
+                        to_attr="example_authors",
+                    )
+                )
+            )
+        # Verify that only 3 authors were prefetched for each book
+        for book in books:
+            self.assertLessEqual(len(book.example_authors), 3)
+            # The authors should be from the sliced queryset (first 3 authors)
+            author_names = [author.name for author in book.example_authors]
+            for name in author_names:
+                self.assertIn(name, ["Charlotte", "Anne", "Emily", "Jane", "Author5", "Author6", "Author7"])
     def test_filter_deferred(self):
         """
         Related filtering of prefetched querysets is deferred until necessary.

JiaYou

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