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| -rw-r--r-- | docs/releases/1.9.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/docs/releases/1.9.txt b/docs/releases/1.9.txt index b3b09abbb5..54323c09f7 100644 --- a/docs/releases/1.9.txt +++ b/docs/releases/1.9.txt @@ -877,6 +877,22 @@ returned a list, but an iterator is more efficient. Existing code that depends on ``list`` specific features, such as indexing, can be ported by converting the iterator into a ``list`` using ``list()``. +Implicit ``QuerySet`` ``__in`` lookup removed +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +In earlier versions, queries such as:: + + Model.objects.filter(related_id=RelatedModel.objects.all()) + +would implicitly convert to:: + + Model.objects.filter(related_id__in=RelatedModel.objects.all()) + +resulting in SQL like ``"related_id IN (SELECT id FROM ...)"``. + +This implicit ``__in`` no longer happens so the "IN" SQL is now "=", and if the +subquery returns multiple results, at least some databases will throw an error. + Miscellaneous ~~~~~~~~~~~~~ |