This commits lifts the restriction that the outermost atomic block must
be declared with savepoint=False. This restriction was overly cautious.
The logic that makes it safe not to create savepoints for inner blocks
also applies to the outermost block when autocommit is disabled and a
transaction is already active.
This makes it possible to use the ORM after set_autocommit(False).
Previously it didn't work because ORM write operations are protected
with atomic(savepoint=False).
The old names were downright confusing. Some seemed to mean the opposite
of what the class actually did.
The new names follow a consistent nomenclature:
(Forward|Reverse)(ManyToOne|OneToOne|ManyToMany)Descriptor.
I mentioned combinations that do not exist in the docstring in order to
help people who would search for them in the code base.
At 2800 lines it was the largest module in the django package. This
commit brings it down to a more manageable 1620 lines.
Very small changes were performed to uniformize import style.
Moved data loss check when assigning to a reverse one-to-one relation on
an unsaved instance to Model.save(). This is exactly the same change as
e4b813c but for reverse relations.
The change partly goes back to the old behavior for forwards migrations
which should reduce the amount of memory consumption (#24745). However,
by the way the current state computation is done (there is no
`state_backwards` on a migration class) this change cannot be applied to
backwards migrations. Hence rolling back migrations still requires the
precomputation and storage of the intermediate migration states.
This improvement also implies that Django does not handle mixed
migration plans anymore. Mixed plans consist of a list of migrations
where some are being applied and others are being unapplied.
Thanks Andrew Godwin, Josh Smeaton and Tim Graham for the review as well
as everybody involved on the ticket that kept me looking into the issue.
This new technique is more straightforward and compatible with test
parallelization, where the effective database connection settings no
longer match settings.DATABASES.
They were removed in Django 1.9.
I could leave the reference to TEST_DEPENDENCIES in the 1.2.4 release
notes because the link points to the right location and the name was
accurate at the time.
Mariusz Felisiak
Ville Skyttä
Tim Graham
Benjamin Wohlwend
Alex Hill
Aymeric Augustin
Josh Smeaton
Raphael Merx
Markus Holtermann
Simon Charette
Iulia Chiriac
Hynek Cernoch
Adam Chainz
Dražen Odobašić
Nick Pope
sarthakmeh
Gavin Wahl
Maxime Lorant
Tyson Clugg
Y3K