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fix error with empty querysets and wrapped prefetch_related

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This commit is contained in:
Laura Klünder 2017-07-27 13:26:04 +02:00
parent afe532f150
commit bd5e0ca264
1 changed files with 1 additions and 1 deletions
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2
src/c3nav/editor/wrappers.py
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@ -308,7 +308,7 @@ class BaseQueryWrapper(BaseWrapper):
This makes sure that the prefetch also happens on the virtually modified database.
"""
lookups_qs = {tuple(lookup.prefetch_through.split('__')): lookup.queryset for lookup in lookups
if isinstance(lookup, Prefetch) and lookup.queryset}
if isinstance(lookup, Prefetch) and lookup.queryset is not None}
for qs in lookups_qs.values():
if not isinstance(qs, QuerySetWrapper):
raise TypeError('Prefetch object queryset needs to be wrapped!')