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Diffstat (limited to 'django/db/models/query.py')
| -rw-r--r-- | django/db/models/query.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/django/db/models/query.py b/django/db/models/query.py index 2f9f9e24ec..563b902bb5 100644 --- a/django/db/models/query.py +++ b/django/db/models/query.py @@ -651,6 +651,10 @@ class QuerySet(object): obj = self.values("pk") return obj.query.as_nested_sql() + # When used as part of a nested query, a queryset will never be an "always + # empty" result. + value_annotation = True + class ValuesQuerySet(QuerySet): def __init__(self, *args, **kwargs): super(ValuesQuerySet, self).__init__(*args, **kwargs) @@ -795,6 +799,10 @@ class EmptyQuerySet(QuerySet): # (it raises StopIteration immediately). yield iter([]).next() + # EmptyQuerySet is always an empty result in where-clauses (and similar + # situations). + value_annotation = False + def get_cached_row(klass, row, index_start, max_depth=0, cur_depth=0, requested=None): |