If SQLITE_MAX_VARIABLE_NUMBER (default = 999) is changed at compile time
to be greater than SQLITE_MAX_COLUMN (default = 2000), which Debian does
by setting the former to 250000, Django raised an exception on queries
containing more than 2000 parameters when DEBUG = True.
This new technique is more straightforward and compatible with test
parallelization, where the effective database connection settings no
longer match settings.DATABASES.
Found cases where testing code was doing
try:
whatever
except (some excption type):
self.fail("exception shouldn't be thrown")
replaced it with just
whatever
as this makes the unexpected errors easier to debug, and the tests
would fail just as much and aren't rendered less readable.
Thanks Markus Holtermann for review
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.
Field.rel is now deprecated. Rel objects have now also remote_field
attribute. This means that self == self.remote_field.remote_field.
In addition, made the Rel objects a bit more like Field objects. Still,
marked ManyToManyFields as null=True.
Complete rework of translating data values from database
Deprecation of SubfieldBase, removal of resolve_columns and
convert_values in favour of a more general converter based approach and
public API Field.from_db_value(). Now works seamlessly with aggregation,
.values() and raw queries.
Thanks to akaariai in particular for extensive advice and inspiration,
also to shaib, manfre and timograham for their reviews.
Several database backends struggle with binary data. This change
minimizes the risk of unrelated tests failures when binary fields
trigger errors.
Forward-port of 2e4bcb9b from stable/1.7.x.
Thanks intgr for the report.
This commit doesn't include a test because I don't know how to emulate a
database disconnection in a cross-database compatible way.
Also simplified a 'backends' test that was constrained by this problem.
Hasan
Aymeric Augustin
Simon Charette
Riccardo Magliocchetti
Dražen Odobašić
Adam Chainz
Maxime Lorant
Caio Ariede
Shai Berger
Claude Paroz
Anssi Kääriäinen
Tim Graham
Collin Anderson
Josh Smeaton
Adam Taylor
Daniel Pyrathon
Andriy Sokolovskiy
Michael Hall
Thomas Chaumeny
Veres Lajos
Berker Peksag
Marc Tamlyn
Anubhav Joshi
Aymeric Augustin