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Fixed #28096 -- Allowed prefetch calls with ModelIterable subclasses

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Regression in 7ec330eeb9.
Thanks Tim Graham for the review.
This commit is contained in:
Claude Paroz 2017-04-19 10:24:22 +02:00
parent dff559ff83
commit 43b4a1618e
4 changed files with 21 additions and 3 deletions
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2
django/db/models/query.py
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@ -1260,7 +1260,7 @@ 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 queryset._iterable_class is not ModelIterable:
if queryset is not None and not issubclass(queryset._iterable_class, ModelIterable):
raise ValueError('Prefetch querysets cannot use values().')
if to_attr:
self.prefetch_to = LOOKUP_SEP.join(lookup.split(LOOKUP_SEP)[:-1] + [to_attr])