diff options
Diffstat (limited to 'django/contrib/contenttypes/fields.py')
| -rw-r--r-- | django/contrib/contenttypes/fields.py | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/django/contrib/contenttypes/fields.py b/django/contrib/contenttypes/fields.py index 0d7ef0f256..46a4e83f49 100644 --- a/django/contrib/contenttypes/fields.py +++ b/django/contrib/contenttypes/fields.py @@ -672,12 +672,17 @@ def create_generic_related_manager(superclass, rel): return self._apply_rel_filters(queryset) def get_prefetch_querysets(self, instances, querysets=None): - if querysets and len(querysets) != 1: - raise ValueError( - "querysets argument of get_prefetch_querysets() should have a " - "length of 1." - ) - queryset = querysets[0] if querysets else super().get_queryset() + _cloning_disabled = False + if querysets: + if len(querysets) != 1: + raise ValueError( + "querysets argument of get_prefetch_querysets() should have a " + "length of 1." + ) + queryset = querysets[0] + else: + _cloning_disabled = True + queryset = super().get_queryset()._disable_cloning() queryset._add_hints(instance=instances[0]) queryset = queryset.using(queryset._db or self._db) # Group instances by content types. @@ -698,8 +703,12 @@ def create_generic_related_manager(superclass, rel): # instances' PK in order to match up instances: object_id_converter = instances[0]._meta.pk.to_python content_type_id_field_name = "%s_id" % self.content_type_field_name + queryset = queryset.filter(query) + # Restore subsequent cloning operations. + if _cloning_disabled: + queryset._enable_cloning() return ( - queryset.filter(query), + queryset, lambda relobj: ( object_id_converter(getattr(relobj, self.object_id_field_name)), getattr(relobj, content_type_id_field_name), |