This allows the removal of its O(n) .get_field_by_name method and many
other awkward access patterns.
While fields were initially stored in a list to preserve the initial
model definiton field ordering the auto-detector doesn't take field
ordering into account and no operations exists to reorder fields of a
model.
This makes the preservation of the field ordering completely superflous
because field reorganization after the creation of the model state
wouldn't be taken into account.
Avoids inspecting the exception message, which is not considered a
stable API and can change across Python versions.
ModuleNotFoundError was introduced in Python 3.6. It is a subclass of
ImportError that is raised when the imported module does not exist. It
is not raised for other errors that can occur during an import. This
exception instance has the property "name" which holds the name of
module that failed to import.
The sql_flush() positional argument sequences is replaced by the boolean
keyword-only argument reset_sequences. This ensures that the old
function signature can't be used by mistake when upgrading Django. When
the new argument is True, the sequences of the truncated tables will
reset. Using a single boolean value, rather than a list, allows making a
binary yes/no choice as to whether to reset all sequences rather than a
working on a completely different set.
This moves all the field referencing resolution methods to shared
functions instead of duplicating efforts amongst state_forwards and
references methods.
MySQL 8.0.3 added support for this syntax but also imposed a
restriction against ALTER TABLE RENAME on tables in a foreign key
relationship if a LOCK TABLES was active which has been lifted in MySQL
8.0.4+.
Since #26291 forward references in natural keys are properly handled by
loaddata, so sorting depenencies in dumpdata doesn't need to break on
cycles. This patch allows circular references in natural keys by
breaking sort_depenencies() on loops.
Non-delayed rendering is unnecessary and wasteful now that state models
relationship consistency on delayed reload is ensured.
This partly reverts commit fcc4e251dbc917118f73d7187ee2f4cbf3883f36.
Delayed reloads of state models broke identity based relationships
between direct and non-direct ancestors.
Basing models.Options related objects map of model labels instead of
their identity ensured relationship consistency is maintained.
Refs #30966.
Co-authored-by: Hasan Ramezani <hasan.r67@gmail.com>
Now that order_by() has expression support passing RawSQL() can achieve
the same result.
This was also already supported through QuerySet.extra(order_by) for
years but this API is more or less deprecated at this point.
