Adjusted known related objects handling of target fields which relies on
from and to_fields and has the side effect of fixing a bug bug causing
N+1 queries when using reverse foreign objects.
Thanks Carsten Fuchs for the report.
* Removed all hardcoded logic for _{fieldname}_cache.
* Added an internal API for interacting with the field values cache.
Thanks carljm and MarkusH for support.
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.
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.
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.
This also updates all dependent functionality, including modelform_factory
and modelformset_factory, and the generic views `ModelFormMixin`,
`CreateView` and `UpdateView` which gain a new `fields` attribute.
This patch iproved two major parts in Django. First, the fields.related
was refactored. The main addition there was ForeignObject. Second, the
ORM now handles multicolumn joins in most cases, though there are still
cases that do not work correcly (split_exclude() for example).
In addition there were extesive changes to how GenericRelation works.
Before it was a fake m2m field, now it is a pure virtual fields and is
based on ForeignObject.
There is still much room for improvement. The related fields code is
still somewhat confusing, and how fields are represented in model._meta
should also be revisited.
This patch was written mostly by Jeremy Tillman with some final polish
by the committer.
Nick Pope
Simon Charette
Tim Graham
Mariusz Felisiak
Nicolas Delaby
Paulo
Mads Jensen
Jon Dufresne
Florian Apolloner
chillaranand
Simon Charette
Claude Paroz
za
Adam Chainz
darius BERNARD
Michal Petrucha
Anssi Kääriäinen
Hasan
Tomo Otsuka
Ville Skyttä
Antoine Catton
Aymeric Augustin
Alex Hill
Flavio Curella
Preston Timmons
Josh Smeaton
Berker Peksag
Rodolfo Carvalho
Roger Hu
Jason Myers
Anssi Kääriäinen
Andrew Godwin
Tim Graham
Luke Plant