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6363 ``ReverseManyToManyDescriptor``, use ``ManyToManyDescriptor`` instead.
6464"""
6565
66def _apply_prefetch_filters_to_sliced_queryset(queryset, query):
67 """
68 Apply filters to a sliced queryset by creating a new queryset that applies
69 filters before the slice and then reapplies the slice.
70
71 This is needed because Django doesn't allow filtering on already sliced
72 querysets, but prefetch operations need to apply additional filters.
73 """
74 if not queryset.query.is_sliced:
75 return queryset.filter(**query)
76
77 # Extract slice parameters
78 low_mark = queryset.query.low_mark
79 high_mark = queryset.query.high_mark
80
81 # Create a new queryset without the slice
82 new_queryset = queryset._chain()
83 new_queryset.query.clear_limits()
84
85 # Apply the prefetch filters
86 new_queryset = new_queryset.filter(**query)
87
88 # Reapply the original slice
89 new_queryset.query.set_limits(low_mark, high_mark)
90
91 return new_queryset
92
6693from django.core.exceptions import FieldError
6794from django.db import connections, router, transaction
6895from django.db.models import Q, signals
145172 }
146173 else:
147174 query = {"%s__in" % self.field.related_query_name(): instances}
148 queryset = queryset.filter(**query)
175 queryset = _apply_prefetch_filters_to_sliced_queryset(queryset, query)
149176
150177 # Since we're going to assign directly in the cache,
151178 # we must manage the reverse relation cache manually.
404431 instance_attr = self.related.field.get_foreign_related_value
405432 instances_dict = {instance_attr(inst): inst for inst in instances}
406433 query = {"%s__in" % self.related.field.name: instances}
407 queryset = queryset.filter(**query)
434 queryset = _apply_prefetch_filters_to_sliced_queryset(queryset, query)
408435
409436 # Since we're going to assign directly in the cache,
410437 # we must manage the reverse relation cache manually.
719746 instance_attr = self.field.get_foreign_related_value
720747 instances_dict = {instance_attr(inst): inst for inst in instances}
721748 query = {"%s__in" % self.field.name: instances}
722 queryset = queryset.filter(**query)
749 queryset = _apply_prefetch_filters_to_sliced_queryset(queryset, query)
723750
724751 # Since we just bypassed this class' get_queryset(), we must manage
725752 # the reverse relation manually.
Test NameStatus
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
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