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Code Issues 32 Releases Wiki Activity

Fixed #31044 -- Errored nicely when using Prefetch with a raw() queryset.

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This commit is contained in:
Hasan Ramezani
2019-12-09 12:55:12 +01:00
committed by Mariusz Felisiak
parent 9e565386d3
commit 4540842bc3
2 changed files with 16 additions and 3 deletions
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11
django/db/models/query.py
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@@ -1534,8 +1534,15 @@ class Prefetch:
self.prefetch_through = lookup
# `prefetch_to` is the path to the attribute that stores the result.
self.prefetch_to = lookup
if queryset is not None and not issubclass(queryset._iterable_class, ModelIterable):
raise ValueError('Prefetch querysets cannot use values().')
if queryset is not None and (
isinstance(queryset, RawQuerySet) or (
hasattr(queryset, '_iterable_class') and
not issubclass(queryset._iterable_class, ModelIterable)
)
):
raise ValueError(
'Prefetch querysets cannot use raw() and values().'
)
if to_attr:
self.prefetch_to = LOOKUP_SEP.join(lookup.split(LOOKUP_SEP)[:-1] + [to_attr])