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

+import sys, pytest, collections, collections.abc, urllib3.exceptions, _pytest.pytester, numpy;
+collections.Mapping = collections.abc.Mapping;
+collections.MutableMapping = collections.abc.MutableMapping;
+collections.MutableSet = collections.abc.MutableSet;
+collections.Sequence = collections.abc.Sequence;
+collections.Callable = collections.abc.Callable;
+collections.Iterable = collections.abc.Iterable;
+collections.Iterator = collections.abc.Iterator;
+urllib3.exceptions.SNIMissingWarning = urllib3.exceptions.DependencyWarning;
+pytest.RemovedInPytest4Warning = DeprecationWarning;
+_pytest.pytester.Testdir = _pytest.pytester.Pytester;
+numpy.PINF = numpy.inf;
+numpy.unicode_ = numpy.str_;
+numpy.bytes_ = numpy.bytes_;
+numpy.float_ = numpy.float64;
+numpy.string_ = numpy.bytes_;
+numpy.NaN = numpy.nan;
+"""Test script to reproduce the Prefetch slicing bug."""
+import os
+import sys
+import django
+from django.conf import settings
+# Configure Django settings
+if not settings.configured:
+    settings.configure(
+        DEBUG=True,
+        DATABASES={
+            'default': {
+                'ENGINE': 'django.db.backends.sqlite3',
+                'NAME': ':memory:',
+            }
+        },
+        INSTALLED_APPS=[
+            'django.contrib.contenttypes',
+            'django.contrib.auth',
+            'test_app',
+        ],
+        SECRET_KEY='test-secret-key',
+    )
+django.setup()
+from django.db.models import Prefetch
+from test_app.models import Category, Post
+def test_prefetch_slice_bug():
+    """Test that reproduces the Prefetch slicing bug."""
+    from django.core.management import execute_from_command_line
+    from django.db import connection
+    # Create tables
+    from django.core.management.color import no_style
+    style = no_style()
+    sql = connection.ops.sql_table_creation_suffix()
+    # Create the tables
+    with connection.schema_editor() as schema_editor:
+        schema_editor.create_model(Category)
+        schema_editor.create_model(Post)
+    # Create test data
+    category1 = Category.objects.create(name="Category 1")
+    category2 = Category.objects.create(name="Category 2")
+    # Create posts for each category
+    for i in range(10):
+        Post.objects.create(title=f"Post {i+1} in Category 1", category=category1)
+        Post.objects.create(title=f"Post {i+1} in Category 2", category=category2)
+    print("Created test data:")
+    print(f"Category 1 has {category1.post_set.count()} posts")
+    print(f"Category 2 has {category2.post_set.count()} posts")
+    # This should work - normal prefetch without slicing
+    print("\nTesting normal prefetch (should work):")
+    try:
+        categories = Category.objects.prefetch_related('post_set').all()
+        for cat in categories:
+            print(f"{cat.name}: {len(cat.post_set.all())} posts")
+        print("✓ Normal prefetch works")
+    except Exception as e:
+        print(f"✗ Normal prefetch failed: {e}")
+    # This should fail - prefetch with slicing
+    print("\nTesting prefetch with slicing (should fail with current bug):")
+    try:
+        categories = Category.objects.prefetch_related(
+            Prefetch(
+                'post_set',
+                queryset=Post.objects.all()[:3],
+                to_attr='example_posts',
+            )
+        ).all()
+        for cat in categories:
+            print(f"{cat.name}: {len(cat.example_posts)} example posts")
+            for post in cat.example_posts:
+                print(f"  - {post.title}")
+        print("✓ Prefetch with slicing works (bug is fixed!)")
+    except Exception as e:
+        print(f"✗ Prefetch with slicing failed: {e}")
+        print(f"Error type: {type(e).__name__}")
+        return False
+    return True
+if __name__ == '__main__':
+    success = test_prefetch_slice_bug()
+    if success:
+        print("\n🎉 All tests passed!")
+    else:
+        print("\n❌ Test failed - bug reproduced")
+        sys.exit(1)

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