* Avoid some unnecessary attribute lookups, e.g. access signals directly rather than from module
* Alias some repeat accesses inside the method to use the slightly faster local lookups
* Use tuple to iterate remaining kwargs as it's faster to construct
* Cache Field.get_default() to avoid running through all the logic on every call
* Use a cached list of the properties on the model class to avoid repeat isinstance() calls
* Added the index name to its deconstruction.
* Added indexes to sqlite3.schema._remake_table() so that indexes
aren't dropped when _remake_table() is called.
Thanks timgraham & MarkusH for review and advice.
This deprecates use_for_related_fields.
Old API:
class CustomManager(models.Model):
use_for_related_fields = True
class Model(models.Model):
custom_manager = CustomManager()
New API:
class Model(models.Model):
custom_manager = CustomManager()
class Meta:
base_manager_name = 'custom_manager'
Refs #20932, #25897.
Thanks Carl Meyer for the guidance throughout this work.
Thanks Tim Graham for writing the docs.
Fields inherited from abstract base classes may be overridden like
any other Python attribute. Inheriting from multiple models/classes
with the same attribute name will follow the MRO.
The only reason why GenericForeignKey and GenericRelation are stored
separately inside _meta is that they need to be cloned for every model
subclass, but that's not true for any other virtual field. Actually,
it's only true for GenericRelation.
This adds a new method, Apps.lazy_model_operation(), and a helper function,
lazy_related_operation(), which together supersede add_lazy_relation() and
make lazy model operations the responsibility of the App registry. This
system no longer uses the class_prepared signal.
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.
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.
Claude Paroz
Tim Graham
Adam Chainz
Adam Chainz
Quentin Fulsher
Ramin Farajpour Cami
Nick Pope
Akshesh
Andrew Nester
Jon Dufresne
Marti Raudsepp
Loïc Bistuer
Aron Podrigal
Michal Petrucha
Anssi Kääriäinen
Simon Charette
Joshua Phillips
Varun Sharma
Raphael Merx
Alex Hill
sarthakmeh
Flavio Curella
Alexander Sosnovskiy
Luis Del Giudice
Andriy Sokolovskiy