# Django 2.1.8.dev20190330215650 documentation

# Django 1.8.6 release notes

November 4, 2015

Django 1.8.6 adds official support for Python 3.5 and fixes several bugs in 1.8.5.

## Bugfixes

- Fixed a regression causing `ModelChoiceField` to ignore `prefetch_related()` on its queryset (#25496).
- Allowed "mode=memory" in SQLite test database name if supported (#12118).
- Fixed system check crash on `ForeignKey` to abstract model (#25503).
- Fixed incorrect queries when you have multiple `ManyToManyField`s on different models that have the same field name, point to the same model, and have their reverse relations disabled (#25545).
- Allowed filtering over a `RawSQL` annotation (#25506).
- Made the `Concat` database function idempotent on SQLite (#25517).
- Avoided a confusing stack trace when starting `runserver` with an invalid `INSTALLED_APPS` setting (#25510). This regression appeared in 1.8.5 as a side effect of fixing #24704.
- Made deferred models use their proxied model's `_meta.apps` for caching and retrieval (#25563). This prevents any models generated in data migrations using `QuerySet.defer()` from leaking to test and application code.
- Fixed a typo in the name of the strictly_above PostGIS lookup (#25592).
- Fixed crash with `contrib.postgres.forms.SplitArrayField` and `IntegerField` on invalid value (#25597).
- Added a helpful error message when Django and South migrations exist in the same directory (#25618).
- Fixed a regression in `URLValidator` that allowed URLs with consecutive dots in the domain section (like `http://example..com/`) to pass (#25620).
- Fixed a crash with `GenericRelation` and `BaseModelAdmin.to_field_allowed` (#25622).