Opened 7 years ago
Last modified 6 years ago
#28723 closed Bug
RelatedManager.get_prefetch_queryset returns "wrong" cache_name — at Initial Version
| Reported by: | Mike Hansen | Owned by: | nobody |
|---|---|---|---|
| Component: | Database layer (models, ORM) | Version: | dev |
| Severity: | Normal | Keywords: | |
| Cc: | Triage Stage: | Accepted | |
| Has patch: | yes | Needs documentation: | no |
| Needs tests: | no | Patch needs improvement: | no |
| Easy pickings: | no | UI/UX: | no |
Description
Currently, RelatedManager.get_prefetch_queryset returns self.field.related_query_name() as the cache_name. In the case where no related_name has been set on the ForeignKey, then this does not match with the through_attr used by get_prefetcher.
Using the models in tests/prefetch_related/models.py,
BookWithYear.objects.prefetch_related('bookreview_set')
will use a through_attr of bookreview_set, but bookreview is what will be placed in _prefetched_objects_cache.
I think related_manager.field.remote_field.get_accessor_name() should be used instead.
I'll post a patch fixing this and adding a test case.
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