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Fixed #24873 -- Prevented nested Prefetch objects from being overwritten.

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Gagaro 2015-05-29 18:10:52 +02:00 • committed by Tim Graham
parent 06747ee790
commit 74261bc593
2 changed files with 17 additions and 1 deletions
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7
django/db/models/query.py
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@ -1538,7 +1538,12 @@ def prefetch_one_level(instances, prefetcher, lookup, level):
# contains some prefetch_related lookups. We don't want to trigger the
# prefetch_related functionality by evaluating the query. Rather, we need
# to merge in the prefetch_related lookups.
additional_lookups = getattr(rel_qs, '_prefetch_related_lookups', [])
# Copy the lookups in case it is a Prefetch object which could be reused
# later (happens in nested prefetch_related).
additional_lookups = [
copy.copy(additional_lookup) for additional_lookup
in getattr(rel_qs, '_prefetch_related_lookups', [])
]
if additional_lookups:
# Don't need to clone because the manager should have given us a fresh
# instance, so we access an internal instead of using public interface