The ConnectionHandler.databases property is no longer used within
Django, but it is maintained for backward compatibility with 3rd party
packages that have used this private API in the past.
The CONN_HEALTH_CHECKS setting can be used to enable database
connection health checks for Django's persistent DB connections.
Thanks Florian Apolloner for reviews.
Previously load_backend() performed search by computing the (sole)
entry of django.db.backends.__path__ manually from
django.db.utils.__file__. Now django.db.backends.__path__ is used
directly.
When Django reraises an exception, it sets the __cause__ attribute even
in Python 2, mimicking Python's 3 behavior for "raise Foo from Bar".
However, Python 3 also ensures that all exceptions have a __traceback__
attribute and thus the "traceback2" Python 2 module (backport of Python
3's "traceback" module) relies on the fact that whenever you have a
__cause__ attribute, the recorded exception also has a __traceback__
attribute.
This is breaking testtools which is using traceback2 (see
https://github.com/testing-cabal/testtools/issues/162).
This commit fixes this inconsistency by ensuring that Django sets
the __traceback__ attribute on any exception stored in a __cause__
attribute of a reraised exception.
The primary use case is to interact with a third-party database (not
primarily managed by Django) that doesn't support time zones and where
datetimes are stored in local time when USE_TZ is True.
Configuring a PostgreSQL database with the TIME_ZONE option while USE_TZ
is False used to result in silent data corruption. Now this is an error.
The new signature enables better support for routing RunPython and
RunSQL operations, especially w.r.t. reusable and third-party apps.
This commit also takes advantage of the deprecation cycle for the old
signature to remove the backward incompatibility introduced in #22583;
RunPython and RunSQL won't call allow_migrate() when when the router
has the old signature.
Thanks Aymeric Augustin and Tim Graham for helping shape up the patch.
Refs 22583.
This allows specifying ForeignKeys in REQUIRED_FIELDS when using a
custom User model.
Thanks cjerdonek and bmispelon for suggestion and timgraham for review.
Change database test settings from "TEST_"-prefixed entries in the
database settings dictionary to setting in a dictionary that is itself
an entry "TEST" in the database settings.
Refs #21775
Thanks Josh Smeaton for review.
Nick Pope
Florian Apolloner
django-bot
Przemysław Suliga
Mariusz Felisiak
William Schwartz
Hasan Ramezani
Jon Dufresne
Andrew Godwin
Benjy Weinberger
Tom
Anton Samarchyan
Tim Graham
Claude Paroz
Simon Charette
Raphaël Hertzog
Caio Ariede
Aymeric Augustin
Andrei Kulakov
Loic Bistuer
Shai Berger
Anubhav Joshi
Marc Tamlyn